US5329390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display element of optical writing type with light absorbing layer including inorganic pigment and leveling layer
Assignee: Sharp Corp
•
Filing: 1992-05-22
•
Granted: 1994-07-12
•
Expires: 2012-05-22
Abstract
Abstract A liquid crystal display element of optical writing type is arranged to have a first transparent substrate, a first transparent electrode layer formed on the first substrate, a photoconductive layer formed on the electrode layer, a light absorbing layer formed on the photoconductive layer, a dielectric layer formed on the light absorbing layer, a second transparent substrate, a second transparent electrode layer formed on the second substrate, and a liquid crystal layer sealed between the second transparent electrode layer and the dielectric layer. The light absorbing layer is formed of a material having pigment dispersed in an organic material, so as to eliminate the necessity of patterning the light absorbing layer. The pigment may be a carbon black or an inorganic material in an acrylic resin, for example. The liquid crystal display element further includes a leveling layer formed on the light absorbing layer.
Inventors
- 👤 Sayuri Fujiwara
- 👤 Akitsugu Hatano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:34
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/135; G02F1/1351
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
136 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, said layer being formed of pigment dispersed in an organic material; a leveling layer formed on said light absorbing layer, said leveling layer being not more than 1.5 μm in thickness; a dielectric layer formed on said light absorbing layer; a second transparent substrate; a second transparent electrode layer formed on said second transparent substrate; and a liquid crystal layer sealed between said second transparent electrode layer and said dielectric layer; wherein said pigment contained in said light absorbing layer is inorganic pigment having a larger resistivity than 10 11 Ω cm.
Claim 2
Dependent Claim
136 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, said layer being formed of pigment dispersed in an organic material; a leveling layer formed on said light absorbing layer, said leveling layer being not more than 1.5 μm in thickness; a dielectric layer formed on said light absorbing layer; a second transparent substrate; a second transparent electrode layer formed on said second transparent substrate; and a liquid crystal layer sealed between said second transparent electrode layer and said dielectric layer; wherein said pigment contained in said light absorbing layer is inorganic pigment having a larger resistivity than 10 11 Ω cm.
Claim 3
Dependent Claim
21 words
A liquid crystal display element according to claim 1, wherein said organic material is a photo-polymerizing material or a heat-polymerizing material.
Claim 4
Dependent Claim
26 words
A liquid crystal display element according to claim 2, wherein said organic material is an acrylic resin, polyimide, polyamide, an epoxy resin or a melamine resin.
Claim 5
Dependent Claim
32 words
A liquid crystal display element according to claim 1, further comprising a first orientation film formed on said dielectric layer and a second orientation film formed on the second transparent electrode film.
Claim 6
Dependent Claim
76 words
A liquid crystal display element according to claim 4, further comprising a pair of spacers through which the combination of said first transparent substrate, said first transparent electrode layer, said photoconductive layer, said light absorbing layer, said leveling layer, and said dielectric layer, and said first orientation film is attached to the combination of said second transparent substrate, said second transparent electrode layer, and said second orientation film with said liquid crystal layer being located therebetween.
Claim 7
Dependent Claim
27 words
A liquid crystal display element according to claim 5, wherein said liquid crystal layer is formed of a phenylcyclohexane type nematic liquid crystal mixed with chiral material.
Claim 8
Dependent Claim
25 words
A liquid crystal display element according to claim 1, further comprising an a.c. power source for applying an a.c. voltage between said transparent electrode films.
Claim 9
Dependent Claim
19 words
A liquid crystal display element according to claim 1, wherein said first and second transparent substrates are glass substrates.
Claim 10
Dependent Claim
28 words
A liquid crystal display element according to claim 8, wherein reflection preventing film is vapor-deposited on the outer side of each of said first and second glass substrates.
Claim 11
Dependent Claim
22 words
A liquid crystal display element according to claim 1, wherein said liquid crystal layer is formed of a liquid crystal compound film.
Claim 12
Dependent Claim
27 words
A liquid crystal display element according to claim 1, wherein said liquid crystal layer uses any one of a dynamic scattering mode or a guest host mode.
Claim 13
Dependent Claim
20 words
A liquid crystal display element according to claim 11, wherein said liquid crystal layer is formed of nematic liquid crystal.
Claim 14
Dependent Claim
46 words
A liquid crystal display element according to claim 1, wherein said liquid crystal layer is formed of nematic liquid crystal and uses any one of the phase transition mode, a twisted nematic mode, an electric field effect induced birefringence mode, or a hybrid field effect mode.
Claim 15
Dependent Claim
34 words
A liquid crystal display element according to claim 1, wherein said liquid crystal layer is formed of a ferroelectric liquid crystal, an anti-ferroelectric liquid crystal, or a smectic liquid crystal having an electroclinic effect.
Claim 16
Dependent Claim
42 words
A liquid crystal display element according to claim 1, wherein said first transparent electrode is formed of an ITO transparent conductive film and an SnO 2 transparent conductive film and said second transparent electrode is formed of an ITO transparent conductive film.
Claim 17
Dependent Claim
24 words
A liquid crystal display element according to claim 1, wherein said photoconductive layer is formed of hydrogenated amorphous silicon or hydrogenated amorphous silicon carbide.
References Cited (Backward Citations)
GB2161952A
Cited
EP0329428A2
Cited
EP0329427A2
Cited
US5084777A
Cited
EP0454480A2
Cited
US5142391A
Cited
US5056895A
Cited
US5233450A
Cited
JPH04134324A
Cited
US5153759A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-07-11 | 1998-01-10 | 1998-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-11 | 2002-01-10 | 2002-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-11 | 2006-01-10 | 2006-07-12 | $7700.00 | Window Closed / Lapsed |