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US5305129A
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US
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Liquid crystal display device of optical writing type having a carbon dispersed light absorbing layer and a cholesteric reflector
Assignee: Sharp Corp
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Filing: 1991-09-24
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Granted: 1994-04-19
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Expires: 2011-09-24
Abstract
Abstract A liquid crystal display element of optical writing type, includes: a first transparent substrate; a first transparent electrode layer formed on the first transparent substrate; a photoconductive layer formed on the first transparent electrode layer; a light absorbing layer formed on the photoconductive layer; a light reflecting layer formed on the light absorbing layer and composed of a macro molecular film of cholesteric liquid crystal; a second transparent substrate; a second transparent electrode layer formed on the second transparent substrate; and a liquid crystal layer disposed between the second transparent electrode layer and the light reflecting layer.
Inventors
- 👤 Sayuri Fujiwara
- 👤 Naofumi Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:35
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/135; G02F1/1333; G02F1/1335; G02F1/133553; G02F1/1352; G02F2201/00; G02F2201/34; G02F2201/343
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
114 words
A liquid crystal display element of optical writing type, comprising: a first transparent substrate; a first transparent electrode layer formed on said first transparent substrate; a photoconductive layer formed on said first transparent electrode layer; a light absorbing layer formed on said photoconductive layer and composed of a coating material of a carbon dispersed type; a light reflecting layer for reflecting light of a predetermined wavelength formed on said light absorbing layer and comprising a macro molecular film of cholesteric liquid crystal a second transparent substrate; a second transparent electrode layer formed on said second transparent substrate; and a liquid crystal layer disposed between said second transparent electrode layer and said light reflecting layer.
Claim 2
Dependent Claim
114 words
A liquid crystal display element of optical writing type, comprising: a first transparent substrate; a first transparent electrode layer formed on said first transparent substrate; a photoconductive layer formed on said first transparent electrode layer; a light absorbing layer formed on said photoconductive layer and composed of a coating material of a carbon dispersed type; a light reflecting layer for reflecting light of a predetermined wavelength formed on said light absorbing layer and comprising a macro molecular film of cholesteric liquid crystal a second transparent substrate; a second transparent electrode layer formed on said second transparent substrate; and a liquid crystal layer disposed between said second transparent electrode layer and said light reflecting layer.
Claim 3
Dependent Claim
18 words
A liquid crystal element according to claim 1, wherein said light reflecting layer includes two macro molecular films.
Claim 4
Dependent Claim
29 words
A liquid crystal element according to claim 2, wherein one of said macro molecular films is levorotatory type and the other of said macro molecular films is dextrorotatory type.
Claim 5
Dependent Claim
42 words
A liquid crystal display element according to claim 1, wherein said liquid crystal layer comprises a low molecular film of cholesteric liquid crystal, which spiral direction is opposite of that of said macro molecular film and reflects light of said predetermined wavelength.
Claim 6
Dependent Claim
41 words
A liquid crystal display element according to claim 4, wherein a product of a pitch and a refractive index of said low molecular film is equal to a product of a pitch and a refractive index of said macro molecular film.
Claim 7
Dependent Claim
22 words
A liquid crystal display element according to claim 1, wherein said liquid crystal layer comprises a scattering type liquid crystal compound film.
Claim 8
Dependent Claim
33 words
A liquid crystal display element according to claim 1, further comprising: a first orientation film formed on said light reflecting layer; and a second orientation film formed on said second transparent electrode layer.
Claim 9
Dependent Claim
19 words
A liquid crystal display element according to claim 7, wherein said liquid crystal layer comprises a nematic liquid crystal.
Claim 10
Dependent Claim
50 words
A liquid crystal display element according to claim 1, further comprising: a first reflection preventing film formed on said first substrate at the outer side of said second transparent substrate; and a second reflection preventing film formed on said second substrate at the outer side of said first transparent substrate.
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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) | 1997-04-18 | 1997-10-18 | 1998-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-04-18 | 2001-10-18 | 2002-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-04-18 | 2005-10-18 | 2006-04-19 | $7700.00 | Window Closed / Lapsed |