EP0644452A2
Expired / Lapsed
EP
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Liquid crystal display device
Assignee: Hitachi Ltd
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Filing: 1994-09-20
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Granted: —
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Expires: 2014-09-20
Abstract
Abstract The invention relates to a liquid crystal display device having electrodes (3,4,5) which form a picture element matrix and generate an electric field (3) substantially parallel to the substrate (1); it is characterized in that it has a brightness recovering time of not greater than 5 min, the brightness recovering time being the time until the brightness of a displayed portion that has been displayed for 30 min and is turned off, returns to the background brightness. The products (ε r ρ) LC , (ε r ρ) AF and/or (ε r ρ) PAS of the specific dielectric constant ε r and the specific resistivity ρ of the liquid crystal layer (LC), the orienting film (AF) and/or the insulating film (PAS) are preferably within the range of 1 x 10⁹ to 8 x 10¹⁵ Ω·cm.
Inventors
- 👤 Masahito Ohe
- 👤 Katsumi Kondo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 17:29
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/133345; G02F1/1337; G02F1/133711; G02F1/1343; G02F1/134309; G02F1/134363; G02F1/133357; G02F1/1335; G02F1/133509; G02F1/133514; G02F1/136; G02F1/1362; G02F2201/00; G02F2201/12; G02F2201/122
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
170 words
Liquid crystal display device, comprising: display picture elements each being composed of electrodes (3, 4, 5) on a substrate (1), an orienting film (8) for the liquid crystal layer (12) formed on the substrate (1) directly or via an insulating layer (7), said substrate (1) being arranged such as to face another substrate (1) on which another orienting film (8) is formed, the liquid crystal layer (12) being held between the two substrates (1), the electrodes being arranged such as to generate an electric field (9) substantially parallel to the substrate (1) and to the liquid crystal layer (12), and being connected to external control means (20, 21, 22), and polarizing means (2) for changing the optical characteristics of the liquid crystal layer (12), characterized in that it has a brightness recovering time of not greater than 5 min, the brightness recovering time being the time until the brightness of a displayed portion that has been displayed for 30 min and is then turned off, returns to the background brightness.
Claim 2
Dependent Claim
69 words
The liquid crystal display device according to claim 1, characterized in that the respective products (ε r ρ) LC , (ε r ρ) AF and/or (ε r ρ) PAS of the specific dielectric constant ε r and the specific resistivity ρ of the liquid crystal layer (12), the orienting film (8) and/or the insulating film (7) are within the range of 1 x 10⁹ to 8 x 10¹⁵ Ω·cm.
Claim 3
Dependent Claim
36 words
The liquid crystal display device according to claim 1 and/or 2, characterized in that the orienting film (8) and/or the insulating film (7) have a surface resistance of 3.0 x 10¹¹ to 2.5 x 10¹⁸ Ω/□.
Claim 4
Dependent Claim
68 words
The liquid crystal display device according to one or more of claims 1 to 3, characterized in that it has approximately similar values of the products (ε r ρ) LC , (ε r ρ) AF and/or (ε r ρ) PAS of the specific dielectric constant ε r and the specific resistivity ρ of the respective liquid crystal layer (12), the orienting film (8) and/or the insulating film (7).
Claim 5
Dependent Claim
77 words
The liquid crystal display device according to one or more of claims 1 to 4, characterized in that the ratio of the maximum value to the minimum value of the respective products (ε r ρ) LC , (ε r ρ) AF and/or (ε r ρ) PAS of the specific dielectric constant ε r and the specific resistivity ρ of the liquid crystal layer (12), the orienting film (8) and/or the insulating film (7) is 1 to 100.
Claim 6
Dependent Claim
112 words
The liquid crystal display device according to one or more of claims 1 to 5, characterized in that the respective products (ε r ρ) LC , (ε r ρ) AF and/or (ε r ρ) PAS of the specific dielectric constant ε r and the specific resistivity ρ of the liquid crystal layer (12), the orienting film (8) and/or the insulating film (7) have a relationship expressed by the following equations (1) to (3): 0.1 ≦ (ε r ρ) LC /(ε r ρ) AF ≦ 10 (1) 0.1 ≦ (ε r ρ) LC /(ε r ρ) PAS ≦ 10 (2) 0.1 ≦ (ε r ρ) AF /(ε r ρ) PAS ≦ 10 (3).
Claim 7
Dependent Claim
39 words
The liquid crystal display device according to one or more of claims 1 to 6, wherein the display picture elements are composed of scanning signal electrodes, image signal electrodes, picture element electrodes, and active elements on the substrate (1).
Claim 8
Dependent Claim
281 words
The liquid crystal display device according to one or more of claims 1 to 7, characterized by one or more of the following features: The sum of the film thickness of the orienting film (8) and of the insulating film (7) on the substrate (1) is 0.5 to 3 µm; the film thickness of the insulating film (7) is 0.4 to 2 µm; the orienting film (8) is made of an organic material, and the insulating film (7) is made of an inorganic material; the orienting film (8) is made of an organic material, and the insulating film (7) has a double-layer structure of an inorganic material and an organic material; the orienting film (8) is made of an organic material; and the insulating film (7) is made of an inorganic material, and the layer composed of the organic material is thicker than the layer composed of the inorganic material; both the orienting film (8) and the insulating film (7) are made of an organic material; the surface plane of the orienting film (8) abutting on the liquid crystal layer (12) is flat; both the orienting film (8) and the insulating film (7) are made of the same material; a color filter is provided on either one of the substrates (1), and the insulating film (7) is provided between the color filter and the liquid crystal layer (12); a flattening film having the function to flatten steps on the color filter surface made of an organic material is provided and an inorganic film is formed on the flattening film; an orienting film (8) on a substrate (1) having a color filter is formed via a layer composed of an inorganic material.
Claim 9
Dependent Claim
62 words
The liquid crystal display device according to one or more of claims 1 to 8, characterized in that a color filter is formed on the substrate (1) which has scanning signal electrodes, image signal electrodes, picture element electrodes, and active elements forming the picture elements, and the insulating film (7) is provided between the color filter and the liquid crystal layer (12).
Claim 10
Dependent Claim
56 words
The liquid crystal display device according to one or more of claims 1 to 9, characterized in that means for inputting information, means for calculating or processing that information in a predetermined manner, a device for the output of the processed information, a device for storing the processed information, and an internal power source are provided.
References Cited (Backward Citations)
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