US4864390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display system with equal path lengths
Assignee: Philips North America LLC
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Filing: 1988-12-29
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Granted: 1989-09-05
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Expires: 2008-12-29
Abstract
Abstract Display systems useful for projection video and television systems are provided to perform with high efficiency and good color rendition. In these systems, color may be provided, as one example, by various light valves, such as liquid crystal displays. Each of the liquid crystal displays are positioned at equal path distances from an illuminating subsystem, and have equal path distances from the light valves to a projection subsystem. This enables optimum illumination of each of the light valves. Various embodiments of arranging the light valves, as well as providing illumination are described.
Inventors
- 👤 Thomas S. McKechnie
- 👤 Jill F. Goldenberg
- 👤 Joshua D. Eskin
- 👤 Jeffrey A. Shimizu
- 👤 Ralph H. Bradley, Jr.
- 👤 William F. Guerinot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:31
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3102; H04N9/3105; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/1313
Claims Analysis
Total Claims: 108
Claim 1
Independent Claim
108 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem said second path length being equal for all transmission light valves.
Claim 2
Dependent Claim
108 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem said second path length being equal for all transmission light valves.
Claim 3
Dependent Claim
19 words
A display system according to claim 1, wherein at least three light valves are included in said modulation subsystem.
Claim 4
Dependent Claim
27 words
A display system according to claim 1, wherein said illumination subsystem includes an elongated light source having a length in the range of 0.3 to 1.5 inches.
Claim 5
Dependent Claim
21 words
A display system according to claim 3, wherein said elongated light source has a length of at most about 1.06 inches.
Claim 6
Dependent Claim
18 words
A display system according to claim 3 or claim 4, wherein said light source is an elongated arc.
Claim 7
Dependent Claim
55 words
A display system according to claim 1 or claim 3, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystals displays modulating green light, and a third of said liquid crystal displays modulating blue light.
Claim 8
Dependent Claim
52 words
A display system according to claim 6, wherein said modulation subsystem further includes a series of dichroic filters and mirrors for passing light through a respective one of said three liquid crystal displays and for recombining each of said red light, said green light, and said blue light before said projection subsystem.
Claim 9
Dependent Claim
27 words
A display system according to claim 6, wherein said illumination subsystem provides one of critical illumination, Kohler illumination, or a combination of critical illumination and Kohler illumination.
Claim 10
Dependent Claim
62 words
A display system according to claim 6, wherein said illumination subsystem includes a light source, at least one reflector means for collecting light not passing to said modulation subsystem, and a condenser lens system for passing light to said modulation subsystem, said at least one reflector means redirecting said light not previously passing to said modulation subsystem to said condenser lens system.
Claim 11
Dependent Claim
29 words
A display system according to claim 1 or 2, wherein said illumination subsystem provides one of critical illumination, Kohler illumination, or a combination of critical illumination and Kohler illumination.
Claim 12
Dependent Claim
23 words
A display system according to claim 1, wherein said illumination subsystem, said modulation subsystem, and said projection subsystem provide a projection TV system.
Claim 13
Dependent Claim
109 words
A projection TV system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from the illuminating substage, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from the projection subsystem, said second path length being equal for all transmission light valves.
Claim 14
Dependent Claim
109 words
A projection TV system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from the illuminating substage, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from the projection subsystem, said second path length being equal for all transmission light valves.
Claim 15
Dependent Claim
53 words
A projection TV system according to claim 12, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light.
Claim 16
Dependent Claim
55 words
A projection TV system according to claim 13, wherein said modulation subsystem further includes a series of dichroic filters and mirrors for passing light through a respective one of each of said three liquid crystal displays and for recombining each of said red light, said green light, and said blue light before said projection subsystem.
Claim 17
Dependent Claim
28 words
A projection TV system according to claim 13, wherein said illumination subsystem provides one of critical illumination, Kohler illumination, or a combination of critical illumination and Kohler illumination.
Claim 18
Dependent Claim
63 words
A projection TV system according to claim 13, wherein said illumination subsystem includes a light source, at least one reflector means for collecting light not passing to said modulation subsystem, and a condenser lens system for passing light to said modulation subsystem, said at least one reflector means redirecting said light not originally passing to said modulation subsystem to said condenser lens system.
Claim 19
Dependent Claim
272 words
A projection TV system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from the illumination substage, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from the projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, wherein said illumination subsystem includes a light source, at least one reflector means for collecting light not passing to said modulation subsystem, and a condenser lens system for passing light to said modulation subsystem, said at least one reflector means redirecting said light not originally passing to said modulation subsystem to said condenser lens system, wherein said light source includes an inner and an outer envelope with plane mirrors within said outer envelope to direct reflected light to at least one image position adjacent said light source, and wherein said reflector means includes reflectors to collect and redirect light to at least one of said light source or said image position for passage through said condenser lens system.
Claim 20
Dependent Claim
272 words
A projection TV system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from the illumination substage, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from the projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, wherein said illumination subsystem includes a light source, at least one reflector means for collecting light not passing to said modulation subsystem, and a condenser lens system for passing light to said modulation subsystem, said at least one reflector means redirecting said light not originally passing to said modulation subsystem to said condenser lens system, wherein said light source includes an inner and an outer envelope with plane mirrors within said outer envelope to direct reflected light to at least one image position adjacent said light source, and wherein said reflector means includes reflectors to collect and redirect light to at least one of said light source or said image position for passage through said condenser lens system.
Claim 21
Dependent Claim
253 words
A projection TV system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from the illumination substage, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from the projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, wherein said illumination subsystem includes a light source, at least one reflector means for collecting light not passing to said modulation subsystem, and a condenser lens system for passing light to said modulation subsystem, said at least one reflector means redirecting said light not originally passing to said modulation subsystem to said condenser lens system, wherein said light source directs light radially in all directions including through said condenser lens system, and wherein said reflector means are provided to redirect light not previously passing through said condenser lens system in a direction for passing through said condenser lens system.
Claim 22
Dependent Claim
253 words
A projection TV system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from the illumination substage, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from the projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, wherein said illumination subsystem includes a light source, at least one reflector means for collecting light not passing to said modulation subsystem, and a condenser lens system for passing light to said modulation subsystem, said at least one reflector means redirecting said light not originally passing to said modulation subsystem to said condenser lens system, wherein said light source directs light radially in all directions including through said condenser lens system, and wherein said reflector means are provided to redirect light not previously passing through said condenser lens system in a direction for passing through said condenser lens system.
Claim 23
Dependent Claim
243 words
A projection TV system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from the illumination substage, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from the projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, wherein said illumination subsystem includes a light source, at least one reflector means for collecting light not passing to said modulation subsystem, and a condenser lens system for passing light to said modulation subsystem, said at least one reflector means redirecting said light not originally passing to said modulation subsystem to said condenser lens system, wherein said light source provides randomly polarized light, and wherein a polarizing beamsplitter and at least one quarterwave plate are provided for directing a desired polarization of said polarized light to said modulation subsystem.
Claim 24
Dependent Claim
243 words
A projection TV system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from the illumination substage, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from the projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, wherein said illumination subsystem includes a light source, at least one reflector means for collecting light not passing to said modulation subsystem, and a condenser lens system for passing light to said modulation subsystem, said at least one reflector means redirecting said light not originally passing to said modulation subsystem to said condenser lens system, wherein said light source provides randomly polarized light, and wherein a polarizing beamsplitter and at least one quarterwave plate are provided for directing a desired polarization of said polarized light to said modulation subsystem.
Claim 25
Dependent Claim
271 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length path from the illumination substage, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from the projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, wherein said illumination subsystem includes a light source, at least one reflector means for collecting light not passing to said modulation subsytem, and a condenser lens system for passing light to said modulation subsystem, said at least one reflector means redirecting said light not originally passing to said modulation subsystem to said condenser lens system, wherein said light source has only one envelope with plane mirrors being inside or outside said envelope to direct reflected light to at least one image position adjacent said light source, and wherein said reflector means includes reflectors to collect and redirect light to at least one of said light source or said image position for passage through said condenser lens system.
Claim 26
Dependent Claim
271 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length path from the illumination substage, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from the projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, wherein said illumination subsystem includes a light source, at least one reflector means for collecting light not passing to said modulation subsytem, and a condenser lens system for passing light to said modulation subsystem, said at least one reflector means redirecting said light not originally passing to said modulation subsystem to said condenser lens system, wherein said light source has only one envelope with plane mirrors being inside or outside said envelope to direct reflected light to at least one image position adjacent said light source, and wherein said reflector means includes reflectors to collect and redirect light to at least one of said light source or said image position for passage through said condenser lens system.
Claim 27
Dependent Claim
172 words
A projection TV system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from the illumination substage, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from the projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, wherein said illumination subsystem includes at least one metal halide lamp or at least one xenon arc lamp.
Claim 28
Dependent Claim
172 words
A projection TV system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from the illumination substage, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from the projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, wherein said illumination subsystem includes at least one metal halide lamp or at least one xenon arc lamp.
Claim 29
Dependent Claim
22 words
A projection TV system according to claim 21, wherein said illumination subsystem has at least two elongated lamps provided side by side.
Claim 30
Dependent Claim
26 words
A projection TV system according to claim 21, wherein said illumination subsystem has a single lamp with at least two elongated arcs provided side by side.
Claim 31
Dependent Claim
132 words
A display device comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, said modulation subsystem including at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from the illumination substage, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from the projection subsystem, said second path length being equal for all transmission light valves, wherein an incandescent light source is provided in said illumination subsystem to supply initial illumination until an arc lamp light source can supply sufficient illumination.
Claim 32
Dependent Claim
132 words
A display device comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, said modulation subsystem including at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from the illumination substage, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from the projection subsystem, said second path length being equal for all transmission light valves, wherein an incandescent light source is provided in said illumination subsystem to supply initial illumination until an arc lamp light source can supply sufficient illumination.
Claim 33
Dependent Claim
8 words
A projection video system according to claim 24.
Claim 34
Dependent Claim
218 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed a first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, wherein said modulation subsystem further includes a series of dichroic filters and mirrors for passing light through a respective one of said three liquid crystal displays and for recombining each of said red light, said green light, and said blue light before said projection subsystem, and wherein entrance and exit locations of said illumination subsystem and said projection subsystem are changed relative to said modulation subsystem.
Claim 35
Dependent Claim
218 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed a first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, wherein said modulation subsystem further includes a series of dichroic filters and mirrors for passing light through a respective one of said three liquid crystal displays and for recombining each of said red light, said green light, and said blue light before said projection subsystem, and wherein entrance and exit locations of said illumination subsystem and said projection subsystem are changed relative to said modulation subsystem.
Claim 36
Dependent Claim
58 words
A display system according to claim 26, wherein said dichroic filters and mirrors at one side of said modulation subsystem are arranged in parallel rows to said dichroic filters and mirrors at another side of said modulation subsystem, said first, second and third liquid crystal displays being individually arranged between said parallel rows of dichroic filters and mirrors.
Claim 37
Dependent Claim
45 words
A display system according to claim 26, wherein said dichroic filters and mirrors are arranged at Brewster's angle to the path of light in said modulation subsystem, and wherein said first, second and third liquid crystal displays are perpendicular to the path of said light.
Claim 38
Dependent Claim
27 words
A display system according to claim 26, wherein said illumination subsystem includes an elongated light source having a length in the range of 0.3 to 1.5 inches.
Claim 39
Dependent Claim
21 words
A display system according to claim 29, wherein said elongated light source has a length of at most about 1.06 inches.
Claim 40
Dependent Claim
223 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystals displays modulating blue light, wherein said modulation subsystem further includes a series of dichroic filters and mirrors for passing light through a respective one of said three liquid crystal displays and for recombining each of said red light, said green light, and said blue light before said projection subsystem, and wherein lens portions of said projection subsystem are disposed in said modulation subsystem, said lens portions being color corrected for said liquid crystal displays.
Claim 41
Dependent Claim
223 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystals displays modulating blue light, wherein said modulation subsystem further includes a series of dichroic filters and mirrors for passing light through a respective one of said three liquid crystal displays and for recombining each of said red light, said green light, and said blue light before said projection subsystem, and wherein lens portions of said projection subsystem are disposed in said modulation subsystem, said lens portions being color corrected for said liquid crystal displays.
Claim 42
Dependent Claim
21 words
A display system according to claim 31, wherein two separate lens portions are provided relative to a respective liquid crystal display.
Claim 43
Dependent Claim
27 words
A display system according to claim 31, wherein said illumination subsystem includes an elongated light source having a length in the range of 0.3 to 1.5 inches.
Claim 44
Dependent Claim
21 words
A display system according to claim 33, wherein said elongated light source has a length of at most about 1.06 inches.
Claim 45
Dependent Claim
229 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, wherein said modulation subsystem further includes a series of dichroic filters and mirrors for passing light through a respective one of said three liquid crystal displays and for recombining each of said red light, said green light, and said blue light before said projection subsystem, and wherein at least one further dichroic filter is disposed in said modulation subsystem, said further filter being rotatable to vary wavelengths of said light passed by said liquid crystal displays.
Claim 46
Dependent Claim
229 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, wherein said modulation subsystem further includes a series of dichroic filters and mirrors for passing light through a respective one of said three liquid crystal displays and for recombining each of said red light, said green light, and said blue light before said projection subsystem, and wherein at least one further dichroic filter is disposed in said modulation subsystem, said further filter being rotatable to vary wavelengths of said light passed by said liquid crystal displays.
Claim 47
Dependent Claim
171 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illumination beam to said projection subsystem, each of said transmission light valves being disposed at first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, and wherein each of said liquid crystal displays is disposed at a tilt from a direction of light travel.
Claim 48
Dependent Claim
171 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illumination beam to said projection subsystem, each of said transmission light valves being disposed at first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, and wherein each of said liquid crystal displays is disposed at a tilt from a direction of light travel.
Claim 49
Dependent Claim
21 words
A display system according to claim 36, wherein said elongated light source has a length of at most about 1.06 inches.
Claim 50
Dependent Claim
171 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illumination beam to said projection subsystem, each of said transmission light valves being disposed at first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, and wherein each of said liquid crystal displays is disposed at a tilt from a direction of light travel.
Claim 51
Dependent Claim
171 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illumination beam to said projection subsystem, each of said transmission light valves being disposed at first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, and wherein each of said liquid crystal displays is disposed at a tilt from a direction of light travel.
Claim 52
Dependent Claim
24 words
A display system according to claim 38, wherein a prism is provided to eliminate trapezoidal distortion of an image of said liquid crystal display.
Claim 53
Dependent Claim
47 words
A display system according to claim 39, wherein said prism is located adjacent said liquid crystal display, said prism having an angle B given by ##EQU3## where A is the angle of tilt of said liquid crystal display and N is the refractive index of said prism.
Claim 54
Dependent Claim
57 words
A display system according to claim 39, wherein said prism is located adjacent an image of said liquid crystal display, said prism having an angle B given by ##EQU4## where A is the angle of tilt of said liquid crystal display, N is the refractive index of said prism, and M is the magnification of said image.
Claim 55
Dependent Claim
27 words
A display system according to claim 38, wherein said illumination subsystem includes an elongated light source having a length in the range of 0.3 to 1.5 inches.
Claim 56
Dependent Claim
21 words
A display system according to claim 42, wherein said elongated light source has a length of at most about 1.06 inches.
Claim 57
Dependent Claim
271 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, wherein said illumination subsystem includes a light source, at least one reflector means for collecting light not passing to said modulation subsystem, and a condenser lens system for passing light to said modulation subsystem, said at least one reflector means redirecting said light not previously passing to said modulation subsystem to said condenser lens system, wherein said light source includes an inner and an outer envelope with plane mirrors within said outer envelope to direct reflected light to at least one image position adjacent said light source, and wherein said reflector means includes reflectors to collect and redirect light to at least one of said light source or said image position for passage through said condenser lens system.
Claim 58
Dependent Claim
271 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, wherein said illumination subsystem includes a light source, at least one reflector means for collecting light not passing to said modulation subsystem, and a condenser lens system for passing light to said modulation subsystem, said at least one reflector means redirecting said light not previously passing to said modulation subsystem to said condenser lens system, wherein said light source includes an inner and an outer envelope with plane mirrors within said outer envelope to direct reflected light to at least one image position adjacent said light source, and wherein said reflector means includes reflectors to collect and redirect light to at least one of said light source or said image position for passage through said condenser lens system.
Claim 59
Dependent Claim
27 words
A display system according to claim 44, wherein said illumination subsystem includes an elongated light source having a length in the range of 0.3 to 1.5 inches.
Claim 60
Dependent Claim
21 words
A display system according to claim 45, wherein said elongated light source has a length of at most about 1.06 inches.
Claim 61
Dependent Claim
252 words
A display system comprising an illumination subsystem providing a single illumination beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, wherein said illumination subsystem includes a light source, at least one reflector means for collecting light not passing to said modulation subsystem, and a condenser lens system for passing light to said modulation subsystem, said at least one reflector means redirecting said light not previously passing to said modulation subsystem to said condenser lens system, wherein said light source directs light radially in all directions including through said condenser lens system, and wherein said reflector means are provided to redirect light not originally passing through said condenser lens system in a direction for passing through said condenser lens system.
Claim 62
Dependent Claim
252 words
A display system comprising an illumination subsystem providing a single illumination beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, wherein said illumination subsystem includes a light source, at least one reflector means for collecting light not passing to said modulation subsystem, and a condenser lens system for passing light to said modulation subsystem, said at least one reflector means redirecting said light not previously passing to said modulation subsystem to said condenser lens system, wherein said light source directs light radially in all directions including through said condenser lens system, and wherein said reflector means are provided to redirect light not originally passing through said condenser lens system in a direction for passing through said condenser lens system.
Claim 63
Dependent Claim
27 words
A display system according to claim 47, wherein said illumination subsystem includes an elongated light source having a length in the range of 0.3 to 1.5 inches.
Claim 64
Dependent Claim
21 words
A display system according to claim 48, wherein said elongated light source has a length of at most about 1.06 inches.
Claim 65
Dependent Claim
242 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, wherein said illumination subsystem includes a light source, at least one reflector means for collecting light not passing to said modulation subsystem, and a condenser lens system for passing light to said modulation subsystem, said at least one reflector means redirecting said light not previously passing to said modulation subsystem to said condenser lens system, wherein said light source provides randomly polarized light, and wherein a polarizing beamsplitter and at least one quarterwave plate are provided for directing a desired polarization of said polarized light to said modulation subsystem.
Claim 66
Dependent Claim
242 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, wherein said illumination subsystem includes a light source, at least one reflector means for collecting light not passing to said modulation subsystem, and a condenser lens system for passing light to said modulation subsystem, said at least one reflector means redirecting said light not previously passing to said modulation subsystem to said condenser lens system, wherein said light source provides randomly polarized light, and wherein a polarizing beamsplitter and at least one quarterwave plate are provided for directing a desired polarization of said polarized light to said modulation subsystem.
Claim 67
Dependent Claim
27 words
A display system according to claim 50, wherein said illumination subsystem includes an elongated light source having a length in the range of 0.3 to 1.5 inches.
Claim 68
Dependent Claim
21 words
A display system according to claim 51, wherein said elongated light source has a length of at most about 1.06 inches.
Claim 69
Dependent Claim
172 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, and wherein said illumination subsystem includes at least one metal halide lamp or at least one xenon arc lamp.
Claim 70
Dependent Claim
172 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, and wherein said illumination subsystem includes at least one metal halide lamp or at least one xenon arc lamp.
Claim 71
Dependent Claim
21 words
A display system according to claim 53, wherein said illumination subsystem has at least two elongated lamps provided side by side.
Claim 72
Dependent Claim
25 words
A display system according to claim 53, wherein said illumination subsystem has a single lamp with at least two elongated arcs provided side by side.
Claim 73
Dependent Claim
27 words
A display system according to claim 53, wherein said illumination subsystem includes an elongated light source having a length in the range of 0.3 to 1.5 inches.
Claim 74
Dependent Claim
21 words
A display system according to claim 56, wherein said elongated light source has a length of at most about 1.06 inches.
Claim 75
Dependent Claim
126 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, and wherein each of said light valves is disposed at a tilt from a direction of light travel.
Claim 76
Dependent Claim
126 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, and wherein each of said light valves is disposed at a tilt from a direction of light travel.
Claim 77
Dependent Claim
23 words
A display system according to claim 58, wherein a prism is provided to eliminate trapezoidal distortion of an image of said light valves.
Claim 78
Dependent Claim
45 words
A display system according to claim 59, wherein said prism is located adjacent said light valves, said prism having an angle B given by ##EQU5## where A is the angle of tilt of said light valves and N is the refractive index of said prism.
Claim 79
Dependent Claim
55 words
A display system according to claim 59, wherein said prism is located adjacent an image of said light valves, said prism having an angle B given by ##EQU6## where A is the angle of tilt of said light valves, N is the refractive index of said prism, and M is the magnification of said image.
Claim 80
Dependent Claim
19 words
A display system according to claim 58, wherein at least three light valves are included in said modulation subsystem.
Claim 81
Dependent Claim
164 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, and wherein said illumination subsystem includes a light source, at least one reflector means for collecting light not passing to said modulation subsystem, and a condenser lens system for passing light to said modulation subsystem, said at least one reflector means redirecting said light not previously passing to said modulation subsystem to said condenser lens system.
Claim 82
Dependent Claim
164 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, and wherein said illumination subsystem includes a light source, at least one reflector means for collecting light not passing to said modulation subsystem, and a condenser lens system for passing light to said modulation subsystem, said at least one reflector means redirecting said light not previously passing to said modulation subsystem to said condenser lens system.
Claim 83
Dependent Claim
70 words
A display system according to claim 63, wherein said light source includes an inner and an outer envelope with plane mirrors within said outer envelope to direct reflected light to at least one image position adjacent said light source, and wherein said reflector means includes reflectors to collect and redirect light to at least one of said light source or said image position for passage through said condenser lens system.
Claim 84
Dependent Claim
52 words
A display system according to claim 63, wherein said light source directs light radially in substantially all directions including through said condenser lens system, and wherein said reflector means are provided to redirect light not previously passing through said condenser lens system in a direction for passing through said condenser lens system.
Claim 85
Dependent Claim
69 words
A display system according to claim 63, wherein said light source has only one envelope with plane mirrors being inside or outside said envelope to direct reflected light to at least one image position adjacent said light source, and wherein said reflector means includes reflectors to collect and redirect light to at least one of said light source or said image position for passage through said condenser lens system.
Claim 86
Dependent Claim
19 words
A display system according to claim 63, wherein at least three light valves are included in said modulation subsystem.
Claim 87
Dependent Claim
197 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsytem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, wherein said illumination subsystem includes a light source, at least one reflector means for collecting light not passing to said modulation subsystem, and a condenser lens system for passing light to said modulation subsystem, said at least one reflector means redirecting said light not previously passing to said modulation subsystem to said condenser lens system, wherein said light source provides randomly polarized light, and wherein a polarizing beamsplitter and at least one quarterwave plate are provided for directing a desired polarization of said polarized light to said modulation subsystem.
Claim 88
Dependent Claim
197 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsytem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, wherein said illumination subsystem includes a light source, at least one reflector means for collecting light not passing to said modulation subsystem, and a condenser lens system for passing light to said modulation subsystem, said at least one reflector means redirecting said light not previously passing to said modulation subsystem to said condenser lens system, wherein said light source provides randomly polarized light, and wherein a polarizing beamsplitter and at least one quarterwave plate are provided for directing a desired polarization of said polarized light to said modulation subsystem.
Claim 89
Dependent Claim
127 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, and wherein said illumination subsystem includes at least one metal halide lamp or at least one xenon arc lamp.
Claim 90
Dependent Claim
127 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, and wherein said illumination subsystem includes at least one metal halide lamp or at least one xenon arc lamp.
Claim 91
Dependent Claim
19 words
A display system according to claim 69, wherein at least three light valves are included in said modulation subsystem.
Claim 92
Dependent Claim
123 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light values directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, and wherein said illumination subsystem has at least two elongated lamps provided side by side.
Claim 93
Dependent Claim
123 words
A display system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light values directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from said illumination subsystem, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from said projection subsystem, said second path length being equal for all transmission light valves, and wherein said illumination subsystem has at least two elongated lamps provided side by side.
Claim 94
Dependent Claim
19 words
A display system according to claim 71, wherein at least three light valves are included in said modulation subsystem.
Claim 95
Dependent Claim
175 words
A projection TV system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing a least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from the illumination substage, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from the projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, and wherein entrance and exit locations of said illumination subsystem and said projection subsystem are changed relative to said modulation subsystem.
Claim 96
Dependent Claim
175 words
A projection TV system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing a least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from the illumination substage, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from the projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, and wherein entrance and exit locations of said illumination subsystem and said projection subsystem are changed relative to said modulation subsystem.
Claim 97
Dependent Claim
59 words
A projection TV system according to claim 73, wherein said dichroic filters and mirrors at one side of said modulation subsystem are arranged in parallel rows to said dichroic filters and mirrors at another side of said modulation subsystem, said first, second and third liquid crystal displays being individually arranged between said parallel rows of dichroic filters and mirrors.
Claim 98
Dependent Claim
46 words
A projection TV system according to claim 73, wherein said dichroic filters and mirrors are arranged at Brewster's angle to the path of light in said modulation subsystem, and wherein said first, second and third liquid crystal displays are perpendicular to the path of said light.
Claim 99
Dependent Claim
222 words
A projection TV system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam, each of said transmission light valves being disposed at a first path length from the illumination substage, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from the projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, wherein said modulation subsystem further includes a series of dichroic filters and mirrors for passing light through a respective one of each of said three liquid crystal displays and for recombining each of said red light, said green light, and said blue light before said projection subsystem, and wherein lens portions of said projection subsystem are disposed in said modulation subsystem, said lens portions being color corrected for said liquid crystal displays.
Claim 100
Dependent Claim
222 words
A projection TV system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam, each of said transmission light valves being disposed at a first path length from the illumination substage, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from the projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, wherein said modulation subsystem further includes a series of dichroic filters and mirrors for passing light through a respective one of each of said three liquid crystal displays and for recombining each of said red light, said green light, and said blue light before said projection subsystem, and wherein lens portions of said projection subsystem are disposed in said modulation subsystem, said lens portions being color corrected for said liquid crystal displays.
Claim 101
Dependent Claim
22 words
A projection TV system according to claim 76, wherein a separate lens portion is provided relative to two different liquid crystal displays.
Claim 102
Dependent Claim
232 words
A projection TV system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from the illumination substage, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from the projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, wherein said modulation subsystem further includes a series of dichroic filters and mirrors for passing light through a respective one of each of said three liquid crystal displays and for recombining each of said red light, said green light, and said blue light before said projection subsystem, and wherein at least one further dichroic filter is disposed in said modulation subsystem, said further filter being rotatable to vary wavelengths of said light passed by said liquid crystal displays.
Claim 103
Dependent Claim
232 words
A projection TV system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from the illumination substage, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from the projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, wherein said modulation subsystem further includes a series of dichroic filters and mirrors for passing light through a respective one of each of said three liquid crystal displays and for recombining each of said red light, said green light, and said blue light before said projection subsystem, and wherein at least one further dichroic filter is disposed in said modulation subsystem, said further filter being rotatable to vary wavelengths of said light passed by said liquid crystal displays.
Claim 104
Dependent Claim
173 words
A projection TV system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from the illumination substage, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from the projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, and wherein each of said liquid crystal displays is disposed at a tilt from a direction of light travel.
Claim 105
Dependent Claim
173 words
A projection TV system comprising an illumination subsystem providing a single illuminating beam, a modulation subsystem, and a projection subsystem, wherein said modulation subsystem includes at least two transmission light valves, each of said transmission light valves directly passing at least a portion of said single illuminating beam to said projection subsystem, each of said transmission light valves being disposed at a first path length from the illumination substage, said first path length being equal for all transmission light valves, and each of said transmission light valves being disposed at a second path length from the projection subsystem, said second path length being equal for all transmission light valves, wherein said light valves in said modulation subsystem include three transmission liquid crystal displays, a first of said liquid crystal displays modulating red light, a second of said liquid crystal displays modulating green light, and a third of said liquid crystal displays modulating blue light, and wherein each of said liquid crystal displays is disposed at a tilt from a direction of light travel.
Claim 106
Dependent Claim
25 words
A projection TV system according to claim 79, wherein a prism is provided to eliminate trapezoidal distortion of an image of said liquid crystal display.
Claim 107
Dependent Claim
48 words
A projection TV system according to claim 80, wherein said prism is located adjacent said liquid crystal display, said prism having an angle B given by ##EQU7## where A is the angle of tilt of said liquid crystal display and N is the refractive index of said prism.
Claim 108
Dependent Claim
58 words
A projection TV system according to claim 80, wherein said prism is located adjacent an image of said liquid crystal display, said prism having an angle B given by ##EQU8## were A is the angle of tilt of said liquid crystal display, N is the refractive index of said prism, and M is the magnification of said image.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |