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EP0435676A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Liquid crystal display device for displaying multiple or full colors

Assignee: Sharp Corp
•
Filing: 1990-12-27
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Granted: —
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Expires: 2010-12-27
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Abstract

Abstract In a liquid crystal display device which displays multiple colors, a light modulation portion (3) containing a liquid crystal or a mixture of liquid crystals is sandwiched between a pair of transparent substrates (2a, 2b) each having transparent electrodes (1a, 1b) in a striped pattern on an inner surface of each transparent substrate. The electrodes (1b) on one transparent substrate (2b) perpendicularly intersect those (1a) on the other transparent substrate (2a). The light modulation portion (3) includes a plurality of mutually adjacent regions (3a, 3b, 3c) of three different kinds which form a single light modulation layer parallel to the transparent substrates (2a, 2b). Regions (3a) of one kind contain dichroic pigment for displaying a red color, regions (3b) of another kind contain dichroic pigment for displaying a green color, and regions (3c) of the other kind contain dichroic pigment for displaying a blue color, as well as the liquid crystal or the mixture of liquid crystals. This liquid crystal display device can display bright, vivid colors because it is not necessary to provide color filters, and is therefore suitable for use in reflective color displays.

Inventors

  • 👤 Mariko Ban
  • 👤 Naofumi Kimura
  • 👤 Yutaka Ishii

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 12:43
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3607; C; C09; C09K; C09K19/00; C09K19/52; C09K19/54; C09K19/542; C09K19/544; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1334; G02F1/1335; G02F1/133509; G02F1/133514; G02F1/1347; G02F1/13475; G09G3/3611; G09G3/3622; G09G3/3629; G02F2202/00; G02F2202/04

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 208 words
A liquid crystal display device for displaying multiple colors wherein a light modulation portion (3; 13; 23) containing a liquid crystal or a mixture of liquid crystals is sandwiched between a pair of transparent substrates (2a, 2b; 12a, 12b; 22a, 22b) each having electrodes (1a, 1b; 11a, 11b; 21a, 21b) in a striped pattern on an inner surface of each transparent substrate (2a, 2b; 12a, 12b; 22a, 22b), the electrodes (1b; 11b; 21b) on one transparent substrate (2b; 12b; 22b) perpendicularly intersecting those (1a; 11a; 21a) on the other transparent substrate (2a; 12a; 22a), characterized in that: the light modulation portion (3; 13; 23) includes a plurality of mutually adjacent regions (3a, 3b, 3c; 13a, 13b, 13c; 23a, 23b, 23c) of at least two different kinds which form a single light modulation layer (3; 13; 23) parallel to the transparent substrates (2a, 2b; 12a, 12b; 22a, 22b), each of said regions (3a, 3b, 3c; 13a, 13b, 13c; 23a, 23b, 23c) contains dichroic pigment in addition to the liquid crystal or the mixture of liquid crystals, the dichroic pigment contained in the regions (3a; 13a; 23a) of one kind is different from the dichroic pigment contained in the regions (3b, 3c; 13b, 13c; 23b, 23c) of the other kinds.
Claim 2
Dependent Claim 21 words
The liquid crystal display device according to Claim 1, further comprising a reflection plate (20; 30; 40) to reflect incident light.
Claim 3
Dependent Claim 46 words
The liquid crystal display device according to Claim 1, wherein each of said adjacent regions (3a, 3b, 3c; 13a, 13b, 13c; 23a, 23b, 23c) in the light modulation portion (3; 13; 23) contains a polymer resin supporting the liquid crystal or the mixture of liquid crystals.
Claim 4
Dependent Claim 95 words
The liquid crystal display device according to Claim 1, wherein a shutter layer (15; 28) containing a liquid crystal or a mixture of liquid crystals is laminated on said single light modulation layer in the light modulation portion (13; 23), and the liquid crystal or the mixture of liquid crystals contained in the shutter layer (15; 28) is caused to be orientated in a specific direction with a threshold voltage which is different from a threshold voltage for the liquid crystal or the mixture of liquid crystals contained in the light modulation layer (13; 23).
Claim 5
Dependent Claim 20 words
The liquid crystal display device according to Claim 4, further comprising a reflection plate (30; 40) to reflect incident light.
Claim 6
Dependent Claim 38 words
The liquid crystal display device according to Claim 4, wherein a shield layer (16) is formed in the shutter layer (15) at sites corresponding to boundaries of said regions (13a, 13b, 13c) in the light modulation layer (13).
Claim 7
Dependent Claim 56 words
The liquid crystal display device according to Claim 4, wherein the the shutter layer (28) is constituted from a liquid crystal layer (25) and a pair of orientation layers (26) sandwiching the liquid crystal layer (25), and a polarization plate (27a, 27b) is provided on an outer surface of each of the transparent substrates (22a, 22b).
Claim 8
Dependent Claim 19 words
The liquid crystal display device according to Claim 7, further comprising a reflection plate (40) to reflect incident light.
Claim 9
Dependent Claim 48 words
A liquid crystal display device wherein a display area can be provided with a selectable color by selectively enabling combinations of individual differently-colored elements within the area, characterised in that the different colors are achieved by providing different pigments within the liquid crystal material of the respective elements.

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