Patent EP0719063A1 successfully refreshed from Google Patents.
Patent US6309073B1 successfully refreshed from Google Patents.
US6309073B1
Expired / Lapsed
US
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Projector
Assignee: Seiko Epson Corp
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Filing: 2000-03-16
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Granted: 2001-10-30
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Expires: 2020-03-16
Abstract
Abstract A projection-type display apparatus includes a light source, a uniform illumination optical system, a color separating system for separating a white light beam emitted from the uniform illumination optical system into three color beams, three liquid crystal panels for respectively modulating each of the separated color beams, a light guide system located on an optical path of the color beam having the longest optical path among the separated color beams, a dichroic prism for synthesizing the beams modulated through the liquid crystal panels, and a projection lens for projecting the synthesized and modulated beam onto a screen. The uniform illumination optical system is provided with a uniform illumination optical device for converting the white light beam emitted from the light source into a uniform beam. Since the dichroic prism, which is an optical element that is rotationally symmetrical about the chief axis of a projection optical system, is employed as a color synthesizing system, and the uniform illumination optical device for restricting unevenness in color and luminous intensity is incorporated in the system, it is possible to realize a display apparatus which causes little unevenness in color and luminous intensity and which has a high illumination efficiency.
Inventors
- 👤 Tadaaki Nakayama
- 👤 Yoshitaka Itoh
- 👤 Akitaka Yajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:18
CPC Classifications
G; G02; G02B; G02B3/00; G02B3/0006; G02B3/0037; G02B3/0043; G02B3/005; G02B3/0056; G02B3/0062; G03; G03B; G03B21/00; G03B21/14; G03B21/20; G03B21/208; G03B33/00; G03B33/10; G03B33/12; H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3102; H04N9/3105; H04N9/3141; H04N9/315; H04N9/3167; H04N5/00; H04N5/74; H04N5/7416; H04N5/7441
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
171 words
A projection-type display apparatus, comprising: a light source; color separating means for separating a light beam emitted from said light source into a plurality of color beams; a plurality of light valves for modulating said separated color beams; light guide means located on an optical path of a color beam having a longest optical path length, the color beams being separated by said color separating means and respectively incident on said light valves; color synthesizing means for synthesizing a projection beam from said color beams modulated through said light valves; a projection lens for projecting said projection beam into a screen; uniform illumination optical means interposed on an optical path between said light source and said color separating means for converting said light beam emitted from said light source into a uniform beam; and a plurality of condenser lenses located respectively in outputting portions of said color separating means for outputting said color beams, the condenser lenses converting said color beams separated by said color separating means into almost collimated beams.
Claim 2
Dependent Claim
171 words
A projection-type display apparatus, comprising: a light source; color separating means for separating a light beam emitted from said light source into a plurality of color beams; a plurality of light valves for modulating said separated color beams; light guide means located on an optical path of a color beam having a longest optical path length, the color beams being separated by said color separating means and respectively incident on said light valves; color synthesizing means for synthesizing a projection beam from said color beams modulated through said light valves; a projection lens for projecting said projection beam into a screen; uniform illumination optical means interposed on an optical path between said light source and said color separating means for converting said light beam emitted from said light source into a uniform beam; and a plurality of condenser lenses located respectively in outputting portions of said color separating means for outputting said color beams, the condenser lenses converting said color beams separated by said color separating means into almost collimated beams.
Claim 3
Dependent Claim
34 words
A projection-type display apparatus according to claim 1 , wherein said light valves are liquid crystal panels, and a pixel pitch of each of said liquid crystal panels is approximately 50 μm or less.
Claim 4
Dependent Claim
26 words
A projection-type display apparatus according to claim 1 , wherein said uniform illumination optical means has at least one lens plate comprising a plurality of lenses.
Claim 5
Dependent Claim
25 words
A projection-type display apparatus according to claim 3 , wherein said uniform illumination optical means comprises a first lens plate and a second lens plate.
Claim 6
Dependent Claim
159 words
A projection-type display apparatus, comprising: a light source; color separating means for separating a light beam emitted from said light source into a plurality of color beams; a plurality of condenser lenses located respectively in outputting portions of said color separating means for outputting said color beams, the condenser lenses converting said color beams separated by said color separating means into almost collimated beams; a plurality of light valves for modulating said separated color beams; light guide means located on an optical path of a color beam having a longest optical path length, the color beams being separated by said color separating means and respectively incident on said light valves; color synthesizing means for synthesizing a projection beam from said color beams modulated through said light valves; a projection lens for projecting said projection beam onto a screen; and polarized beam conversion means for converting the light beam emitted from said light source into one kind of polarized light.
Claim 7
Dependent Claim
159 words
A projection-type display apparatus, comprising: a light source; color separating means for separating a light beam emitted from said light source into a plurality of color beams; a plurality of condenser lenses located respectively in outputting portions of said color separating means for outputting said color beams, the condenser lenses converting said color beams separated by said color separating means into almost collimated beams; a plurality of light valves for modulating said separated color beams; light guide means located on an optical path of a color beam having a longest optical path length, the color beams being separated by said color separating means and respectively incident on said light valves; color synthesizing means for synthesizing a projection beam from said color beams modulated through said light valves; a projection lens for projecting said projection beam onto a screen; and polarized beam conversion means for converting the light beam emitted from said light source into one kind of polarized light.
Claim 8
Dependent Claim
43 words
A projection-type display apparatus according to claim 5 , wherein uniform illumination optical means is interposed on an optical path between said light source and said color separating means for converting said light beam emitted from said light source into a uniform beam.
Claim 9
Dependent Claim
77 words
A projection-type display apparatus according to claim 5 , wherein said polarized beam conversion means comprises: polarized beam separating means for separating a random polarized beam from said light source into two kinds of linearly polarized beams; and polarization plane rotating means for rotating a polarization plane of one of said two kinds of linearly polarized beams through a 90 degree angle so that one kind of polarized light is emitted from said polarized beam conversion means.
Claim 10
Dependent Claim
122 words
A projection-type display apparatus, comprising: a light source emitting a light beam; a uniform illumination optical device that converts said light beam emitted from said light source into a uniform beam; a color separating optical system that separates the beam emitted from said light source into a plurality of color beams; a plurality of condenser lenses located respectively in outputting portions of said color separating optical system, the condenser lenses converting said color beams into almost collimated beams; a plurality of light valves that modulate said separated color beams; a light guide system located on an optical path of a color beam having a longest optical path length; and a color synthesizing system that synthesizes said color beams into a projection beam.
Claim 11
Dependent Claim
122 words
A projection-type display apparatus, comprising: a light source emitting a light beam; a uniform illumination optical device that converts said light beam emitted from said light source into a uniform beam; a color separating optical system that separates the beam emitted from said light source into a plurality of color beams; a plurality of condenser lenses located respectively in outputting portions of said color separating optical system, the condenser lenses converting said color beams into almost collimated beams; a plurality of light valves that modulate said separated color beams; a light guide system located on an optical path of a color beam having a longest optical path length; and a color synthesizing system that synthesizes said color beams into a projection beam.
Claim 12
Dependent Claim
19 words
The projection-type display apparatus according to claim 8 , further comprising a projection lens that projects said projection beam.
Claim 13
Dependent Claim
34 words
The projection-type display apparatus according to claim 8 , wherein said light valves are liquid crystal panels, and a pixel pitch of each of said liquid crystal panels is approximately 50 μm or less.
Claim 14
Dependent Claim
26 words
The projection-type display apparatus according to claim 8 , wherein said uniform illumination optical device has at least one lens plate comprising a plurality of lenses.
Claim 15
Dependent Claim
25 words
A projection-type display apparatus according to claim 11 , wherein said uniform illumination optical device comprises a first lens plate and a second lens plate.
Claim 16
Dependent Claim
123 words
A projection-type display apparatus, comprising: a light source emitting a light beam; a polarized beam conversion device that converts the light beam emitted from said light source into a light beam having a single polarization type; a color separating optical system that separates the light beam into a plurality of color beams; a plurality of condenser lenses located respectively in outputting portions of said color separating optical system, the condenser lenses converting said color beams into almost collimated beams; a plurality of light valves that modulate said separated color beams; a light guide system located on an optical path of a color beam having a longest optical path length; and a color synthesizing system that synthesizes said color beams into a projection beam.
Claim 17
Dependent Claim
123 words
A projection-type display apparatus, comprising: a light source emitting a light beam; a polarized beam conversion device that converts the light beam emitted from said light source into a light beam having a single polarization type; a color separating optical system that separates the light beam into a plurality of color beams; a plurality of condenser lenses located respectively in outputting portions of said color separating optical system, the condenser lenses converting said color beams into almost collimated beams; a plurality of light valves that modulate said separated color beams; a light guide system located on an optical path of a color beam having a longest optical path length; and a color synthesizing system that synthesizes said color beams into a projection beam.
Claim 18
Dependent Claim
18 words
The projection-type display apparatus of claim 13 , further comprising a projection lens that projects said projection beam.
Claim 19
Dependent Claim
45 words
The projection-type display apparatus according to claim 13 , further comprising a uniform illumination optical device interposed on an optical path between said light source and said color separating optical system that converts said light beam having a single polarization type into a uniform beam.
Claim 20
Dependent Claim
84 words
The projection-type display apparatus according to claim 13 , wherein said polarized beam conversion device comprises: a polarized beam separating device that separates a random polarized beam from said light source into two kinds of linearly polarized light beams; and a polarization plane rotating device that rotates a polarization plane of one of said two kinds of linearly polarized light beams through a 90 degree angle so that said light beam having a single polarization type is emitted from said polarized beam conversion device.
References Cited (Backward Citations)
US3296923A
Cited
US5075798A
Cited
US4787737A
Cited
JPS62237485A
Cited
JPS6346490A
Cited
JPS62258491A
Cited
JPS63116123A
Cited
JPS63121821A
Cited
JPH0194985A
Cited
US4943154A
Cited
JPH0225016A
Cited
JPH0267312A
Cited
US5054910A
Cited
US5157523A
Cited
US5098184A
Cited
JPH03152526A
Cited
US5446510A
Cited
EP0467447A1
Cited
JPH04234016A
Cited
JPH0486725A
Cited
US5270804A
Cited
EP0512898A1
Cited
JP3152526B2
Cited
US5626409A
Cited
US5605390A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-10-29 | 2005-04-30 | 2005-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-10-29 | 2009-04-30 | 2009-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-10-29 | 2013-04-30 | 2013-10-30 | $7700.00 | Window Closed / Lapsed |