US5170194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reflection type liquid crystal valve and projector having the same
Assignee: Canon Inc
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Filing: 1990-12-21
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Granted: 1992-12-08
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Expires: 2010-12-21
Abstract
Abstract A reflection type liquid crystal light valve comprises a first transparent substrate, a second transparent substrate for supporting the liquid crystal layer together with the first transparent substrate therebetween, a driver for driving liquid crystal molecules of the liquid crystal layer to modulate a light directed to the liquid crystal layer through the first transparent substrate, and a heat sink substrate attached to the second transparent substrate and having a reflection plane for reflecting the light directed thereto through the second transparent substrate to the first transparent substrate, on a plane thereof facing the second transparent substrate.
Inventors
- 👤 Katsumi Kurematsu
- 👤 Nobuo Minoura
- 👤 Haruyuki Yanagi
- 👤 Masaaki Kanashiki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:48
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/133382; G02F1/133385; G03; G03B; G03B21/00; G03B21/14; G03B21/16; H; H04; H04N; H04N5/00; H04N5/74; H04N5/7416; H04N5/7441; H04N9/00; H04N9/12; H04N9/31; H04N9/3141; H04N9/3144
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
100 words
A reflection type liquid crystal light bulb comprising: a first transparent substrate; a liquid crystal layer; a second transparent substrate for supporting together with said first transparent substrate said liquid crystal layer therebetween; drive means for driving liquid crystal molecules of said liquid crystal layer for modulating a light directed to said liquid crystal layer through said first transparent substrate; and a heat sink substrate mounted on said second transparent substrate and having a reflection plane for reflecting the light directed thereto through said second transparent substrate to said first transparent substrate, on a plane facing said second transparent substrate.
Claim 2
Dependent Claim
100 words
A reflection type liquid crystal light bulb comprising: a first transparent substrate; a liquid crystal layer; a second transparent substrate for supporting together with said first transparent substrate said liquid crystal layer therebetween; drive means for driving liquid crystal molecules of said liquid crystal layer for modulating a light directed to said liquid crystal layer through said first transparent substrate; and a heat sink substrate mounted on said second transparent substrate and having a reflection plane for reflecting the light directed thereto through said second transparent substrate to said first transparent substrate, on a plane facing said second transparent substrate.
Claim 3
Dependent Claim
90 words
A reflection type liquid crystal light value according to claim 1 wherein said drive means has first and second transparent electrodes, said first transparent electrode being formed on a plane of said first transparent substrate facing said liquid crystal layer and said second transparent electrode being formed on a plane of said second transparent substrate facing said liquid crystal layer, and said drive means applies an electric field to said liquid crystal layer through said first and second transparent electrodes to drive liquid crystal molecules of said liquid crystal layer.
Claim 4
Dependent Claim
63 words
A reflection type liquid crystal light value according to claim 2 wherein said first transparent substrate has a first polarization filter on a plane opposite to said liquid crystal layer, and said second transparent substrate has a second polarization filter having a polarization axis parallel to a polarization axis of said first polarization filter on a plane opposite to said liquid crystal layer.
Claim 5
Dependent Claim
25 words
A reflection type liquid crystal light value according to any one of claims 1 to 3 wherein said heat sink substrate is made of aluminum.
Claim 6
Dependent Claim
26 words
A reflection type liquid crystal light value according to any one of claims 1 to 3 wherein said heat sink substrate is made of aluminum nitride.
Claim 7
Dependent Claim
26 words
A reflection type liquid crystal light value according to any one of claims 1 to 3 wherein said heat sink substrate has a heat sink fin.
Claim 8
Dependent Claim
80 words
A reflection type liquid crystal light value comprising: a transparent substrate; a liquid crystal layer; a heat sink substrate for holding said liquid crystal layer together with said transparent substrate and having a reflection surface on a plane thereof facing said liquid crystal layer for reflecting a light directed thereto through said transparent substrate and said liquid crystal layer to said transparent substrate; and drive means for driving liquid crystal molecules of said liquid crystal layer for modulating the light.
Claim 9
Dependent Claim
80 words
A reflection type liquid crystal light value comprising: a transparent substrate; a liquid crystal layer; a heat sink substrate for holding said liquid crystal layer together with said transparent substrate and having a reflection surface on a plane thereof facing said liquid crystal layer for reflecting a light directed thereto through said transparent substrate and said liquid crystal layer to said transparent substrate; and drive means for driving liquid crystal molecules of said liquid crystal layer for modulating the light.
Claim 10
Dependent Claim
64 words
A reflection type liquid crystal light value according to claim 7 wherein said drive means has a transparent electrode formed on a plane of said transparent substrate facing said liquid crystal layer, and said drive means applies an electric field to said liquid crystal layer through said transparent electrode and said heat sink substrate to drive liquid crystal molecules of said liquid crystal layer.
Claim 11
Dependent Claim
58 words
A reflection type liquid crystal light value according to claim 8 wherein said transparent substrate has a first polarization filter on a plane thereof opposite to said liquid crystal layer, and said heat sink substrate has a second polarization filter having a polarization axis parallel to a polarization axis of said first polarization filter on said reflection plane.
Claim 12
Dependent Claim
25 words
A reflection type liquid crystal light value according to any one of claims 7 to 9 wherein said heat sink substrate is made of aluminum.
Claim 13
Dependent Claim
25 words
A reflection type liquid crystal light value according to any one of claims 7 to 9 wherein said heat sink substrate is made of copper.
Claim 14
Dependent Claim
26 words
A reflection type liquid crystal light value according to any one of claims 7 to 9 wherein said heat sink substrate has a heat sink fin.
Claim 15
Dependent Claim
105 words
A reflection type liquid crystal light value comprising: a transparent substrate having a transparent electrode; a liquid crystal layer; a conductive heat sink substrate for supporting said liquid crystal layer together with said transparent substrate therebetween and having a reflection plane for reflecting a light directed thereto through said transparent substrate and said liquid crystal layer to said transparent substrate, on a plane thereof facing said liquid crystal layer; and drive means for applying an electric field to said liquid crystal layer through said transparent electrode and said heat sink substrate for modulating the light to drive liquid crystal molecules of said liquid crystal layer.
Claim 16
Dependent Claim
105 words
A reflection type liquid crystal light value comprising: a transparent substrate having a transparent electrode; a liquid crystal layer; a conductive heat sink substrate for supporting said liquid crystal layer together with said transparent substrate therebetween and having a reflection plane for reflecting a light directed thereto through said transparent substrate and said liquid crystal layer to said transparent substrate, on a plane thereof facing said liquid crystal layer; and drive means for applying an electric field to said liquid crystal layer through said transparent electrode and said heat sink substrate for modulating the light to drive liquid crystal molecules of said liquid crystal layer.
Claim 17
Dependent Claim
20 words
A reflection type liquid crystal light value according to claim 13 wherein said heat sink substrate is made of aluminum.
Claim 18
Dependent Claim
20 words
A reflection type liquid crystal light value according to claim 13 wherein said heat sink substrate is made of copper.
Claim 19
Dependent Claim
26 words
A reflection type liquid crystal light value according to any one of claims 13 to 15 wherein said heat sink substrate has a heat sink fin.
Claim 20
Dependent Claim
124 words
A projector comprising: means for supplying a light; and means for modulating and reflecting the light to generate an image, including; a first transparent substrate; a liquid crystal layer; a second transparent substrate for supporting said liquid crystal layer together with said first transparent substrate therebetween; drive means for driving liquid crystal molecules of said liquid crystal layer in accordance with a video signal to modulate the light directed to said liquid crystal layer through said first transparent substrate to generate the image; and a heat sink substrate attached to said second transparent substrate and having a reflection plane for reflecting the light directed thereto through said second transparent substrate to said first transparent substrate, on a plane thereof facing said second transparent substrate.
Claim 21
Dependent Claim
124 words
A projector comprising: means for supplying a light; and means for modulating and reflecting the light to generate an image, including; a first transparent substrate; a liquid crystal layer; a second transparent substrate for supporting said liquid crystal layer together with said first transparent substrate therebetween; drive means for driving liquid crystal molecules of said liquid crystal layer in accordance with a video signal to modulate the light directed to said liquid crystal layer through said first transparent substrate to generate the image; and a heat sink substrate attached to said second transparent substrate and having a reflection plane for reflecting the light directed thereto through said second transparent substrate to said first transparent substrate, on a plane thereof facing said second transparent substrate.
Claim 22
Dependent Claim
105 words
A projector comprising: means for supplying a light; and means for modulating and reflecting the light to generate an image, including; a transparent substrate; a liquid crystal layer; a heat sink substrate for supporting said .i liquid crystal layer together with said transparent substrate therebetween, and having a reflection plane for reflecting a light directed thereto through said transparent substrate and said liquid crystal layer to said transparent substrate, on a plane thereof facing said liquid crystal layer; and drive means for driving liquid crystal molecules of said liquid crystal layer in accordance with a video signal for modulating the light to generate the image.
Claim 23
Dependent Claim
105 words
A projector comprising: means for supplying a light; and means for modulating and reflecting the light to generate an image, including; a transparent substrate; a liquid crystal layer; a heat sink substrate for supporting said .i liquid crystal layer together with said transparent substrate therebetween, and having a reflection plane for reflecting a light directed thereto through said transparent substrate and said liquid crystal layer to said transparent substrate, on a plane thereof facing said liquid crystal layer; and drive means for driving liquid crystal molecules of said liquid crystal layer in accordance with a video signal for modulating the light to generate the image.
Claim 24
Dependent Claim
128 words
A projector comprising: means for supplying a light; and means for modulating and reflecting the light to generate an image, including; a transparent substrate having a transparent electrode; a liquid crystal layer; a conductive heat sink substrate for supporting said liquid crystal layer together with said transparent substrate therebetween and having a reflection plane for reflecting a light directed thereto through said transparent substrate and said liquid crystal layer to said transparent substrate, on a plane thereof facing said liquid crystal layer; and drive means for applying an electric field to said liquid crystal layer through said transparent electrode and said heat sink substrate in accordance with a video signal to drive liquid crystal molecules of said liquid crystal layer to modulate the light to generate the image.
Claim 25
Dependent Claim
128 words
A projector comprising: means for supplying a light; and means for modulating and reflecting the light to generate an image, including; a transparent substrate having a transparent electrode; a liquid crystal layer; a conductive heat sink substrate for supporting said liquid crystal layer together with said transparent substrate therebetween and having a reflection plane for reflecting a light directed thereto through said transparent substrate and said liquid crystal layer to said transparent substrate, on a plane thereof facing said liquid crystal layer; and drive means for applying an electric field to said liquid crystal layer through said transparent electrode and said heat sink substrate in accordance with a video signal to drive liquid crystal molecules of said liquid crystal layer to modulate the light to generate the image.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-12-08 | 1996-06-08 | 1996-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-08 | 2000-06-08 | 2000-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-08 | 2004-06-08 | 2004-12-08 | $7700.00 | Window Closed / Lapsed |