US5805243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal projector using a spatial light modulator and two rotating color filters
Assignee: Sharp Corp
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Filing: 1996-04-05
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Granted: 1998-09-08
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Expires: 2016-04-05
Abstract
Abstract A liquid crystal display apparatus which includes: a light-addressed liquid crystal light valve including a photoconductive layer and a liquid crystal layer between a pair of light transmitting substrates, each of the light transmitting substrates having an electrode for applying a voltage across the photoconductive layer and the liquid crystal layer; a writing unit for writing an image of a display medium in the light-addressed liquid crystal light valve with writing light from the display medium through a writing lens; a projecting unit for projecting the image written in the light-addressed liquid crystal light valve by irradiating reading light from a projection light source to the light-addressed liquid crystal light valve; and a controlling unit for controlling at least one of operational characteristics of the light-addressed liquid crystal light valve and a luminance of the writing light in accordance with a luminance of the display medium, is disclosed.
Inventors
- 👤 Akitsugu Hatano
- 👤 Hiroshi Hamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:41
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3102; H04N9/312
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
163 words
A liquid crystal apparatus, comprising: a light-addressed liquid crystal light valve including a photoconductive layer and a liquid crystal layer between a pair of light transmitting substrates, each of the light transmitting substrates having an electrode for applying a voltage across the photoconductive layer and the liquid crystal layer; writing means for writing an image of a display medium in the light-addressed liquid crystal light valve with writing light from the display medium through a writing lens; projecting means for projecting the image written in the light-addressed liquid crystal light valve by irradiating reading light from a projection light source to the light-addressed liquid crystal light valve; and color separating means for separating the writing light and the reading light into three primary color beams in a time dividing manner, wherein the color separating means comprises at least two rotating color filters, the rotating color filters each including three primary color filters, each of the rotating color filters being synchronized with each other.
Claim 2
Dependent Claim
163 words
A liquid crystal apparatus, comprising: a light-addressed liquid crystal light valve including a photoconductive layer and a liquid crystal layer between a pair of light transmitting substrates, each of the light transmitting substrates having an electrode for applying a voltage across the photoconductive layer and the liquid crystal layer; writing means for writing an image of a display medium in the light-addressed liquid crystal light valve with writing light from the display medium through a writing lens; projecting means for projecting the image written in the light-addressed liquid crystal light valve by irradiating reading light from a projection light source to the light-addressed liquid crystal light valve; and color separating means for separating the writing light and the reading light into three primary color beams in a time dividing manner, wherein the color separating means comprises at least two rotating color filters, the rotating color filters each including three primary color filters, each of the rotating color filters being synchronized with each other.
Claim 3
Dependent Claim
175 words
A liquid crystal display apparatus, comprising: a light-addressed liquid crystal light valve including a photoconductive layer and a liquid crystal layer between a pair of light transmitting substrates, each of the light transmitting substrates having an electrode for applying a voltage across the photoconductive layer and the liquid crystal layer; writing means for writing an image of a display medium in the light-addressed liquid crystal light valve with writing light from the display medium through a writing lens; projecting means for projecting the image written in the light-addressed liquid crystal light valve by irradiating reading light from a projection light source to the light-addressed liquid crystal light valve; color separating means for separating the writing light and reading light into three primary color beams, wherein the color separating means comprises at least two rotating color filters, the rotating color filters each including three primary color filters, each of the rotating color filters being synchronized with each other; and color combining means for combining three primary color beams reflected by the light-addressed liquid crystal light valve.
Claim 4
Dependent Claim
175 words
A liquid crystal display apparatus, comprising: a light-addressed liquid crystal light valve including a photoconductive layer and a liquid crystal layer between a pair of light transmitting substrates, each of the light transmitting substrates having an electrode for applying a voltage across the photoconductive layer and the liquid crystal layer; writing means for writing an image of a display medium in the light-addressed liquid crystal light valve with writing light from the display medium through a writing lens; projecting means for projecting the image written in the light-addressed liquid crystal light valve by irradiating reading light from a projection light source to the light-addressed liquid crystal light valve; color separating means for separating the writing light and reading light into three primary color beams, wherein the color separating means comprises at least two rotating color filters, the rotating color filters each including three primary color filters, each of the rotating color filters being synchronized with each other; and color combining means for combining three primary color beams reflected by the light-addressed liquid crystal light valve.
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) | 2001-09-07 | 2002-03-09 | 2002-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-07 | 2006-03-09 | 2006-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-07 | 2010-03-09 | 2010-09-08 | $7700.00 | Window Closed / Lapsed |