Patent EP0488164A2 successfully refreshed from Google Patents.
EP0488164A2
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EP
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Liquid crystal display device and display apparatus using same
Assignee: Hitachi Ltd
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Filing: 1991-11-26
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Granted: —
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Expires: 2011-11-26
Abstract
Abstract A liquid crystal display device, comprising a set of substrates (1A, 1B) facing each other at least one of which is transparent, transparent electrodes (2A, 2B) provided respectively to each facing plane of the substrates (1A, 1B), a light absorbing layer held between the transparent electrodes (2A, 2B), and an electric power source (5) for applying an electric field to the light absorbing layer, characterized in that the light absorbing layer is composed of two layers (3A, 3B), each of the layers has dichroism, and average light absorbing axis of the each layers (3A, 3B) without electric field is approximately parallel to the substrate plane and crossing each other almost orthogonally, and the average light absorbing axis of the each layers changes the axis direction by applying said electric field. In accordance with the present invention, the liquid crystal display device has eye-tireless bright display, long life time, and an electric power saving character is realized.
Inventors
- 👤 Masato Isogai
- 👤 Teruo Kitamura
- 👤 Katsumi Kondo
- 👤 Junichi Hirakata
- 👤 Shinichi Komura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 14:15
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1347; G02F1/13475; G02F1/1334
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
135 words
A liquid crystal display device, comprising: a set of substrates (1A, 1B) facing each other at least one of which is transparent, transparent electrodes (2A, 2B) provided respectively to each facing plane of said substrates (1A, 1B), a light absorbing layer held between said transparent electrodes (2A, 2B), and an electric power source (5) for applying an electric field to said light absorbing layer through said transparent electrodes (2A, 2B), characterized in that said light absorbing layer is composed of two layers (3A, 3B), each of the layers has dichroism, average light absorbing axis of the each layers (3A, 3B) without electric field is approximately parallel to the substrate plane and crossing each other almost orthogonally, and said average light absorbing axis of the each layers changes the axis direction by applying of electric field.
Claim 2
Dependent Claim
172 words
A liquid crystal display device, comprising: a set of substrates (1A, 1B) facing each other at least one of which is transparent, transparent electrodes (2A, 2B) provided respectively to each facing plane of said substrates (1A, 1B), a light absorbing layer held between said transparent electrodes (2A, 2B), and an electric power source (5) for applying an electric field to said light absorbing layer through said transparent electrodes (2A, 2B), characterized in that said light absorbing layer is composed of two layers (3A, 3B), each of the layers has dichroism, an average light absorbing axis of the each layers (3A, 3B) without electric field is approximately parallel to the substrate plane and crossing each other almost orthogonally, the one of said light absorbing layers is composed of polymer layer and liquid crystal, that is, nematic liquid crystal having dichroism and positive dielectric anisotropy is dispersed in transparent polymer matrix, and the other light absorbing layer is a nematic liquid crystal layer surrounded with seal members and having dichroism and positive dielectric anisotropy.
Claim 3
Dependent Claim
71 words
The liquid crystal display device as claimed in claim 2, wherein the contacting portion of said polymer layer with said liquid crystal layer and the portion of said transparent electrode formed plane of said liquid crystal layer have alignment control layer for orientation of said liquid crystal parallel of same direction or reverse direction, and the alignment of said liquid crystal layer is directed approximately in same direction or reverse direction.
Claim 4
Dependent Claim
123 words
A liquid crystal display device, comprising: a set of substrates (1A, 1B) facing each other at least one of which is transparent, transparent electrodes (2A, 2B) provided respectively to each facing plane of said substrates, and a polymer layer held between said transparent electrodes (2A, 2B), characterized in that said polymer layer is composed of two layers, each of the layers is composed of nematic liquid crystal particles having dichroism and positive dielectric anisotropy dispersed in transparent polymer matrix, said nematic liquid crystals in each of said layers are aligned approximately parallel to the plane of said substrate in a specific orientation, and the orientation of the alignment of said two layers are so determined as to cross over each other almost orthogonally.
Claim 5
Dependent Claim
59 words
The liquid crystal display device as claimed in any of claims from 2 to 4, wherein the relationship, n o ≦n p ≦n e , is established among the refractive indexes, n o and n e , of said nematic liquid crystal to ordinary light and extraordinary light and the refractive index, n p , of the polymer matrix.
Claim 6
Dependent Claim
38 words
The liquid crystal display device as claimed in any of claims from 2 to 4, wherein an anisotropy of refractive index Δn (= n e - n o ) of said nematic liquid crystal is at most 0.1.
Claim 7
Dependent Claim
23 words
The liquid crystal display device as claimed in any of claims from 2 to 6, wherein said transparent polymer matrix is stretched uniaxially.
Claim 8
Dependent Claim
24 words
The liquid crystal display device as claimed in any of claims from 2 to 6, wherein said transparent polymer matrix is liquid crystalline polymer.
Claim 9
Dependent Claim
47 words
The liquid crystal display device as claimed in any of claims from 1 to 8, wherein said light absorbing layer is transparent polymer matrix in which nematic liquid crystal is dispersed particlewise, and the average particle size of said nematic liquid crystal is at least 1 µm.
Claim 10
Dependent Claim
28 words
The liquid crystal display device as claimed in any of claims from 2 to 9, wherein the thickness of said transparent polymer layer is at most 30 µm.
Claim 11
Dependent Claim
130 words
A liquid crystal display device, comprising: a set of substrates (1A, 1B) facing each other at least one of which is transparent, transparent electrodes (2A, 2B) provided respectively to each facing plane of said substrates, liquid crystal alignment control layers provided on said transparent electrodes (2A, 2B), two liquid crystal layers separated by a polymer layer and held between said set of substrates (1A, 1B), and seal portions surrounding a vicinity of said liquid crystal layer, characterized in that said liquid crystal layer is nematic liquid crystal having dichroism and positive dielectric anisotropy, said nematic liquid crystal is approximately parallel to the substrate plane and is aligned to a designated orientation, and the orientation of alignment in said two layers of liquid crystal layers are crossing each other almost orthogonally.
Claim 12
Dependent Claim
21 words
The liquid crystal display device as claimed in claim 11, wherein said liquid crystal is nematic liquid crystal including dichromatic dye.
Claim 13
Dependent Claim
73 words
The liquid crystal display device as claimed in claim 11, wherein liquid crystal alignment control layers are formed on both sides of said polymer layer, orientating directions of alignment of said liquid crystal alignment control layers on both sides mutually cross over almost orthogonally and are approximately parallel or reverse parallel to orientating direction of the alignment formed in said liquid crystal alignment control layer at opposite side beyond said liquid crystal layer.
Claim 14
Dependent Claim
61 words
The liquid crystal display device as claimed in claim 11, wherein said polymer layer has double structure comprising polymer materials which are stretched uniaxially, said stretched directions mutually cross over almost orthogonally, and the orientating direction of the alignment formed in said liquid crystal alignment control layer at opposite side beyond said liquid crystal layer approximately coincides with the stretched direction.
Claim 15
Dependent Claim
43 words
The liquid crystal display device as claimed in claim 11, wherein the thicknesses of said two layers of liquid crystal are approximately equal, and the thickness of said polymer layer is at most 10 times of the thickness of said liquid crystal layers.
Claim 16
Dependent Claim
34 words
The liquid crystal display device as claimed in any of claims 1, 2, 4, and 11, wherein transistors (11) are formed on one of transparent electrodes (2A, 2B) formed on said substrates (1A, 1B).
Claim 17
Dependent Claim
28 words
The liquid crystal display device as claimed in any of claims 1, 2, 4, and 11, wherein a reflector (10) is provided outside of said substrates (1A, 1B).
Claim 18
Dependent Claim
218 words
A projection type display apparatus, comprising: a white light source (7), dichroic mirrors (101A, 101B) for dividing white light outgoing from said white light source (7) into three primary colors, elements for forming images by being driven and controlled in accordance with external signal of designated light divided by said mirrors (101A, 101B), mirrors (102B, 101C, 101D) for reflecting image light passing through said elements, and lenses (103D) for projection of said reflected images by said mirrors to a screen (105), characterized in that said elements are liquid crystal display devices (100A, 100B, 100C) comprising: a set of substrates (1A, 1B) facing each other at least one of which is transparent, transparent electrodes (2A, 2B) provided respectively to each facing plane of said substrates (1A, 1B), a light absorbing layer held between said transparent electrodes, and an electric power source (5) for applying an electric field to said light absorbing layer through said transparent electrodes (2A, 2B), wherein said light absorbing layer is composed of two layers (3A, 3B), each of the layers has dichroism, average light absorbing axis of the each layers without electric field is approximately parallel to the substrate plane and crossing each other almost orthogonally, and said average light absorbing axis of the each layers changes the axis direction by applying said electric field.
Claim 19
Dependent Claim
153 words
A display apparatus comprising: a liquid crystal display device having a set of substrates (1A, 1B) facing each other at least one of which is transparent, transparent electrodes (2A, 2B) provided respectively to each facing plane of said substrates (1A, 1B), a light absorbing layer held between said transparent electrodes (2A, 2B), and an electric power source (5) for applying an electric field to said light absorbing layer through said transparent electrodes (2A, 2B), characterized in that said light absorbing layer is composed of two layers (3A, 3B), each of the layers has dichroism, average light absorbing axis of the each layers without electric field is approximately parallel to the substrate plane and crossing each other almost orthogonally, said average light absorbing axis of the each layers changes the axis direction by applying said electric field, and a matrix electrode serves as said transparent electrode (2A, 2B) for operation of said display device.
References Cited (Backward Citations)
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