US4936658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projection type liquid crystal displaying device
Assignee: Seiko Precision Inc
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Filing: 1987-07-07
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Granted: 1990-06-26
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Expires: 2007-07-07
Abstract
Abstract A projection type liquid crystal display device includes a light source and condenser lenses for emitting two groups of beams of light which orthogonally cross each other. A first device is disposed in the path of one of the groups of beams and comprises a liquid crystal panel and at least one polarization plate to transmit P-wave polarized light. A second device is disposed in a path of the other group of beams of light and comprises a liquid crystal panel and at least one polarization plate to transmit P-wave polarized light. A dichroic mirror disposed to receive light from the first and second devices synthesizes the P-wave polarized light by transmitting P-wave polarized light from the first device and for reflecting the P-wave polarized light from the second device.
Inventors
- 👤 Sakae Tanaka
- 👤 Tadahiko Yamaoka
- 👤 Shingo Takahashi
- 👤 Tomoaki Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:03
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3141; H04N9/315; H04N9/3167; G; G02; G02B; G02B27/00; G02B27/0018
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
169 words
A projection type liquid crystal display device comprising: light emitting means for emitting two groups of beams of light which are orthogonal and cross each other at an area of intersection; first means disposed in the path of one of the groups of beams of light between the light emitting means and the area of intersection and comprising a liquid crystal panel and at least one polarization plate to transmit P-wave polarized light; second means disposed in the path of the other of the groups of beams of light between the light emitting means and the area of intersection and comprising a liquid crystal panel and at least one polarization plate to transmit P-wave polarized light; and a dichroic mirror disposed at the area of intersection to receive P-wave polarized light from the first and second means for synthesizing the P-wave polarized light received therefrom, the dichroic mirror including means for transmitting P-wave polarized light from the first means and for reflecting P-wave polarized light from the second means.
Claim 2
Dependent Claim
169 words
A projection type liquid crystal display device comprising: light emitting means for emitting two groups of beams of light which are orthogonal and cross each other at an area of intersection; first means disposed in the path of one of the groups of beams of light between the light emitting means and the area of intersection and comprising a liquid crystal panel and at least one polarization plate to transmit P-wave polarized light; second means disposed in the path of the other of the groups of beams of light between the light emitting means and the area of intersection and comprising a liquid crystal panel and at least one polarization plate to transmit P-wave polarized light; and a dichroic mirror disposed at the area of intersection to receive P-wave polarized light from the first and second means for synthesizing the P-wave polarized light received therefrom, the dichroic mirror including means for transmitting P-wave polarized light from the first means and for reflecting P-wave polarized light from the second means.
Claim 3
Dependent Claim
22 words
A device according to claim 1; wherein the dichroic mirror includes means for reflecting green light and transmitting red and blue light.
Claim 4
Dependent Claim
190 words
A projection type liquid crystal display device comprising: light emitting means for emitting two groups of beams of light which are orthogonal and cross each other at an area of intersection; first means disposed in the path of one of the groups of beams of light between the light emitting means and the area of intersection and comprising a liquid crystal panel and at least one polarization plate to transmit P-wave polarized light; second means disposed in the path of the other of the groups of beams of light between the light emitting means and the area of intersection and comprising a liquid crystal panel and at least one polarization plate to transmit P-wave polarized light; a dichroic mirror disposed at the area of intersection to receive P-wave polarized light from the first and second means for synthesizing the P-wave polarized light received therefrom, the dichroic mirror including means for transmitting P-wave polarized light from the first means and for reflecting P-wave polarized light from the second means; and lenses for converting the groups of beams onto the dichroic mirror by an angle in the range of 0° to 5°.
Claim 5
Dependent Claim
190 words
A projection type liquid crystal display device comprising: light emitting means for emitting two groups of beams of light which are orthogonal and cross each other at an area of intersection; first means disposed in the path of one of the groups of beams of light between the light emitting means and the area of intersection and comprising a liquid crystal panel and at least one polarization plate to transmit P-wave polarized light; second means disposed in the path of the other of the groups of beams of light between the light emitting means and the area of intersection and comprising a liquid crystal panel and at least one polarization plate to transmit P-wave polarized light; a dichroic mirror disposed at the area of intersection to receive P-wave polarized light from the first and second means for synthesizing the P-wave polarized light received therefrom, the dichroic mirror including means for transmitting P-wave polarized light from the first means and for reflecting P-wave polarized light from the second means; and lenses for converting the groups of beams onto the dichroic mirror by an angle in the range of 0° to 5°.
Claim 6
Dependent Claim
22 words
A device according to claim 3; wherein the dichroic mirror includes means for reflecting green light and transmitting red and blue light.
Claim 7
Dependent Claim
151 words
A projection type liquid crystal display device comprising: light emitting means for emitting two groups of beams of light having red, green and blue components; means for directing the groups of beams of light to intersect orthogonally in a given area; a dichroic mirror disposed in the given area and receptive of the directed groups of beams of light for transmitting at least one of the light components and reflecting another of the light components to combine the same into one combined group of beams; first means disposed in the path of one of the groups for transmitting P-wave polarized light of at least one of the components to the dichroic mirror; second means disposed in the path of the other of the groups for transmitting P-wave polarized light of another of the components to the dichroic mirror; and means receptive of the combined group of beams for projecting the same.
Claim 8
Dependent Claim
151 words
A projection type liquid crystal display device comprising: light emitting means for emitting two groups of beams of light having red, green and blue components; means for directing the groups of beams of light to intersect orthogonally in a given area; a dichroic mirror disposed in the given area and receptive of the directed groups of beams of light for transmitting at least one of the light components and reflecting another of the light components to combine the same into one combined group of beams; first means disposed in the path of one of the groups for transmitting P-wave polarized light of at least one of the components to the dichroic mirror; second means disposed in the path of the other of the groups for transmitting P-wave polarized light of another of the components to the dichroic mirror; and means receptive of the combined group of beams for projecting the same.
Claim 9
Dependent Claim
22 words
A device according to claim 5; wherein the dichroic mirror includes means for reflecting green light and transmitting red and blue light.
Claim 10
Dependent Claim
120 words
A device according to claim 5; wherein the second means comprises means for splitting the other of the groups into a third group orthogonal thereto, and means for combining the third group with said one of the groups; the first means includes a first polarization plate and a first liquid crystal panel for transmitting light corresponding to one color component; and the second means includes a second polarization plate and a second liquid crystal panel disposed in the path of said other group downstream of the splitting means for transmitting light corresponding to a second color component, and a third liquid crystal panel disposed in the path of the third group for transmitting light corresponding to a third color component.
Claim 11
Dependent Claim
172 words
A projection type liquid crystal display device comprising: light emitting means for emitting two groups of beams of light having red, green and blue components; means for directing the groups of beams of light to intersect orthogonally in a given area; a dichroic mirror disposed in the given area and receptive of the directed groups of beams of light for transmitting at least one of the light components and reflecting another of the light components to combine the same into one combined group of beams; first means disposed in the path of one of the groups for transmitting P-wave polarized light of at least one of the components to the dichroic mirror; second means disposed in the path of the other of the groups for transmitting P-wave polarized light of another of the components to the dichroic mirror; means receptive of the combined group of beams for projecting the same; and lenses for coverging the groups of beams onto the dichroic mirror by an angle in the range of 0° to 5°.
Claim 12
Dependent Claim
172 words
A projection type liquid crystal display device comprising: light emitting means for emitting two groups of beams of light having red, green and blue components; means for directing the groups of beams of light to intersect orthogonally in a given area; a dichroic mirror disposed in the given area and receptive of the directed groups of beams of light for transmitting at least one of the light components and reflecting another of the light components to combine the same into one combined group of beams; first means disposed in the path of one of the groups for transmitting P-wave polarized light of at least one of the components to the dichroic mirror; second means disposed in the path of the other of the groups for transmitting P-wave polarized light of another of the components to the dichroic mirror; means receptive of the combined group of beams for projecting the same; and lenses for coverging the groups of beams onto the dichroic mirror by an angle in the range of 0° to 5°.
Claim 13
Dependent Claim
22 words
A device according to claim 8; wherein the dichroic mirror includes means for reflecting green light and transmitting red and blue light.
Claim 14
Dependent Claim
120 words
A device according to claim 8; wherein the second means comprises means for splitting the other of the groups into a third group orthogonal thereto, and means for combining the third group with said one of the groups; the first means includes a first polarization plate and a first liquid crystal panel for transmitting light corresponding to one color component; and the second means includes a second polarization plate and a second liquid crystal panel disposed in the path of said other group downstream of the splitting means for transmitting light corresponding to a second color component, and a third liquid crystal panel disposed in the path of the third group for transmitting light corresponding to a third color component.
References Cited (Backward Citations)
US3588324A
Cited
US4190832A
Cited
JPS602916A
Cited
JPS6097315A
Cited
US4687301A
Cited
US4796978A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-25 | 1993-12-25 | 1994-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-25 | 1997-12-25 | 1998-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-25 | 2001-12-25 | 2002-06-26 | $7700.00 | Window Closed / Lapsed |