Patent US4991223A successfully refreshed from Google Patents.
US5305129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display device of optical writing type having a carbon dispersed light absorbing layer and a cholesteric reflector
Assignee: Sharp Corp
•
Filing: 1991-09-24
•
Granted: 1994-04-19
•
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 05:55
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.
References Cited (Backward Citations)
US3848965A
Cited
US4246302A
Cited
JPS6143702A
Cited
JPS61213803A
Cited
US4726660A
Cited
JPS6418130A
Cited
EP0329427A2
Cited
US4941735A
Cited
US5193015A
Cited
US5142391A
Cited
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 |