EP0454480A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Liquid-crystal display device of optical writing type
Assignee: Sharp Corp
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Filing: 1991-04-26
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Granted: —
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Expires: 2011-04-26
Abstract
Abstract A liquid-crystal display device of optical writing type includes a first transparent substrate, a first transparent electrode layer formed on the first transparent substrate, a photoconductive layer (13) formed on the first transparent electrode layer, a light-absorbing layer composed of an organic film, the light-absorbing layer (14) formed on the photoconductive layer, a dielectric layer (15) formed on the light-absorbing layer, 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 dielectric layer.
Inventors
- 👤 Sayuri Fujiwara
- 👤 Naofumi Kimura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 20:08
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/135; G02F1/1351
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
87 words
A liquid-crystal display device 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 composed of an organic film, said light-absorbing layer formed on said photoconductive layer; 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 disposed between said second transparent electrode layer and said dielectric layer.
Claim 2
Dependent Claim
20 words
A liquid-crystal display device according to claim 1, wherein said light-absorbing layer is composed of a carbon-dispersed system coating material.
Claim 3
Dependent Claim
57 words
A liquid-crystal display device according to claim 2, wherein said light-absorbing layer is formed to have a thickness of about 1.5 µm by means of coating carbon-dispersed system coating material with a spinner on said photoconductive layer, photo-polymerizing said carbon-dispersed system coating material by exposing said material, sintering said photo-polymerized coating material for five minutes at 200°C.
Claim 4
Dependent Claim
43 words
A liquid-crystal display device according to claim 2, wherein said carbon-dispersed system coating material is made by dispersing carbon black in an acrylic system resin and has a resistivity of 10⁷Ω·cm and a permeability of about 0.3 % in a visible light range.
Claim 5
Dependent Claim
22 words
A liquid-crystal display device according to claim 3, wherein said carbon-dispersed system coating material is consisted of polyimide, polyamide, or epoxy resin.
Claim 6
Dependent Claim
19 words
A liquid-crystal display device according to claim 1, wherein said first transparent substrate is consisted of a glass plate.
Claim 7
Dependent Claim
22 words
A liquid-crystal display device according to claim 1, wherein said first transparent electrode layer is composed of an ITO transparent conductive film.
Claim 8
Dependent Claim
30 words
A liquid-crystal display device according to claim 1, wherein said photoconductive layer is composed of hydrogenated amorphous silicon (a-Si:H) and is formed to have a thickness of about 3 µm.
Claim 9
Dependent Claim
29 words
A liquid-crystal display device according to claim 1, wherein said dielectric layer is formed by means of alternately laminating silicon dioxide and titanium dioxide with an electron-beam vaporing method.
Claim 10
Dependent Claim
27 words
A liquid-crystal display device according to claim 9, wherein said dielectric-layer is formed to have a thickness of about 2 µm and a reflectance of 99 %.
Claim 11
Dependent Claim
20 words
A liquid-crystal display device according to claim 1, wherein said liquid-crystal layer is formed by nematic liquid-crystal or smectic liquid-crystal.
Claim 12
Dependent Claim
97 words
A liquid-crystal display device according to claim 11, wherein said liquid-crystal layer includes a dispersed type liquid-crystal compound film, said liquid-crystal compound film is formed by means of mixing 30 weight % of bifunctional acrylate consisting of a UV polymerizing compound, 70 weight % of nematic liquid-crystal, and a small amount of polymerization initiator, forming homogeneous solution consisting of said bifunctional acrylate, nematic liquid-crystal and polymerization initiator, filtering said homogeneous solution, coating said filtered solution on said dielectric layer with a thickness of 10 µm by using a spinner, and exposing said coated solution through ultraviolet rays.
Claim 13
Dependent Claim
19 words
A liquid-crystal display device according to claim 1, wherein said second transparent substrate is consisted of a glass plate.
Claim 14
Dependent Claim
28 words
A liquid-crystal display device according to claim 1, wherein said second transparent electrode layer is composed of an ITO transparent conductive film and formed by a sputtering method.
Claim 15
Dependent Claim
29 words
A liquid-crystal display device according to claim 1, wherein said device comprises an a.c. power source for applying an a.c. voltage between said first and second transparent electrode layers.
Claim 16
Dependent Claim
33 words
A liquid-crystal display device according to claim 1, wherein said device comprises a first orientation film formed on said dielectric layer and a second orientation film formed on said second transparent electrode layer.
Claim 17
Dependent Claim
34 words
A liquid-crystal display device according to claim 16, wherein said first orientation film is formed by spin-coating a polyimide film and adjusting a molecular orientation of said polyimide film by using a rubbing method.
Claim 18
Dependent Claim
22 words
A liquid-crystal display device according to claim 16, wherein said device comprises two spacers arranged between said first and second orientation films.
Claim 19
Dependent Claim
91 words
An optical display device comprising a first transparent electrode, a photoconductive layer disposed on one side of the transparent electrode, a light absorbing layer disposed to the side of the photoconductive layer remote from the first transparent electrode, a dielectric layer disposed to the side of the light absorbing layer remote from the first transparent electrode, and a liquid crystal layer disposed to the side of the dielectric layer between the dielectric layer and a second transparent electrode characterised in that the light absorbing layer is formed from an organic film.
Claim 20
Dependent Claim
68 words
An optical display device having a photoconductive layer and a liquid crystal layer so arranged that a display produced by reflection of light through the layer can be changed by the application of light to the photoconductive layer, the device having a light absorbing layer between the liquid crystal layer and the photoconductive layer, characterised in that the light absorbing layer comprises a resin having carbon dispersed therein.
References Cited (Backward Citations)
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