EP0407164A2
Expired / Lapsed
EP
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Liquid crystal display device
Assignee: Sharp Corp
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Filing: 1990-07-04
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Granted: —
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Expires: 2010-07-04
Abstract
Abstract The invention presents a liquid crystal display device (1) characterized by forming pixel portions (15) of transparent electrodes (5), (6) in part of the confronting surface of a pair of light-transmissive substrates, (2), (3) forming orientation films (10), (11) on the pixel portions (15) and non-pixel portions (14) in the remaining surface of the light-transmissive substrates (2), (3) by way of insulation films, (7), (8), (9) and filling the gap of the light-transmissive substrates (2), (3) with liquid crystal, (4) wherein at least on one of the light-transmissive substrates, (2), (3) insulation films (7), (8), (9) of different materials are formed in the pixel portions (15) and non-pixel portions (14), or the insulation film (7) is formed only in the pixel portions (15). According to the invention, therefore, the asymmetricity of liquid crystal molecular orientation is weak in the pixel portions (15), and a bistable memory effect may be obtained, whereas in the non-pixel portions (14) the orientation asymmetricity is intensified, so that a uniform clarity may be obtained.
Inventors
- 👤 Nobuyuki Itoh
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 00:30
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133345
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
115 words
A liquid crystal display device (1) characterized by forming pixel portions (15) of transparent electrodes (5), (6) in part of the confronting surface of a pair of light-transmissive substrates, (2), (3) forming orientation films (10), (11) on the pixel portions (15) and non-pixel portions (14) in the remaining surface of the light-transmissive substrates (2), (3) by way of insulation films, (7), (8), (9) and filling the gap of the light-transmissive substrates (2), (3) with liquid crystal (4), wherein at least on one of the light-transmissive substrates, (2), (3) insulation films (7), (8), (9) of different materials are formed at the orientation film (10), (11) contacting sides of the pixel portions (15) and non-pixel portions (14).
Claim 2
Dependent Claim
115 words
A liquid crystal display device (1) characterized by forming pixel portions (15) of transparent electrodes (5), (6) in part of the confronting surface of a pair of light-transmissive substrates, (2), (3) forming orientation films (10), (11) on the pixel portions (15) and non-pixel portions (14) in the remaining surface of the light-transmissive substrates (2), (3) by way of insulation films, (7), (8), (9) and filling the gap of the light-transmissive substrates (2), (3) with liquid crystal (4), wherein at least on one of the light-transmissive substrates, (2), (3) insulation films (7), (8), (9) of different materials are formed at the orientation film (10), (11) contacting sides of the pixel portions (15) and non-pixel portions (14).
Claim 3
Dependent Claim
58 words
A liquid crystal display device (1) according to claim 1, wherein the insulation film (7) formed in the pixel portions (15) is the film for decreasing the asymmetricity of the liquid crystal molecular orientation, and the insulation film (8) formed in the non-pixel portions (14) is the film for increasing the asymmetricity of the liquid crystal molecular orientation.
Claim 4
Dependent Claim
43 words
A liquid crystal display device (1) according to claim 1, wherein the insulation film (7) formed in the pixel protions (15) is Ta₂O₅, Al₂O₃, SiN x , ZnO or Y₂O₃, and the insulation film (8) formed in the non-pixel portions (14) is SiO₂.
Claim 5
Dependent Claim
24 words
A liquid crystal display device (1) according to claim 1, wherein the thickness of the orientation film (10), (11) is 500 Å or less.
Claim 6
Dependent Claim
99 words
A liquid crystal display device (1) characterized by forming pixel portions (15) of transparent electrodes (5), (6) in part of the confronting surface of a pair of light-transmissive substrates, (2), (3) forming orientation films (10), (11) on the pixel portions (15) and non-pixel portions (14) in the remaining surface of the light-transmissive substrates (2), (3) by way of insulation films, (7), (9) and filling the gap of the light-transmissive substrates (2), (3) with liquid crystal, (4) wherein at least on one of the light-transmissive substrates, (2), (3) the insulation film (7) is formed only on the pixel portions (15).
Claim 7
Dependent Claim
99 words
A liquid crystal display device (1) characterized by forming pixel portions (15) of transparent electrodes (5), (6) in part of the confronting surface of a pair of light-transmissive substrates, (2), (3) forming orientation films (10), (11) on the pixel portions (15) and non-pixel portions (14) in the remaining surface of the light-transmissive substrates (2), (3) by way of insulation films, (7), (9) and filling the gap of the light-transmissive substrates (2), (3) with liquid crystal, (4) wherein at least on one of the light-transmissive substrates, (2), (3) the insulation film (7) is formed only on the pixel portions (15).
Claim 8
Dependent Claim
29 words
A liquid crystal display device (1) according to claim 5, wherein the insulation film (7), (9) formed in the pixel portions (15) is SiO₂, Ta₂O₅, Al₂O₃, ZnO or Y₂O₃.
Claim 9
Dependent Claim
24 words
A liquid crystal display device (1) according to claim 5, wherein the thickness of the orientation film (10), (11) is 500 Å or less.
Claim 10
Dependent Claim
22 words
A liquid crystal display device (1) according to claim 1 or 5, wherein the liquid crystal (4) is a ferrodielectric liquid crystal.
Claim 11
Dependent Claim
95 words
A liquid crystal display device in which an array of pixels is defined by a first set of parallel transparent electrodes on one of a pair of opposed light-transmissive substrates and a second set of parallel transparent electrodes provided on the other substrate, and extending in a direction across the first set of electrodes, each said substrate carrying an orientation film over the respective set of electrodes, wherein on at least one of said substrate means is provided to create a difference in insulation under the orientation film on pixel areas and on non-pixel areas.
Claim 12
Dependent Claim
95 words
A liquid crystal display device in which an array of pixels is defined by a first set of parallel transparent electrodes on one of a pair of opposed light-transmissive substrates and a second set of parallel transparent electrodes provided on the other substrate, and extending in a direction across the first set of electrodes, each said substrate carrying an orientation film over the respective set of electrodes, wherein on at least one of said substrate means is provided to create a difference in insulation under the orientation film on pixel areas and on non-pixel areas.
References Cited (Backward Citations)
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