Patent EP0338412A2 successfully refreshed from Google Patents.
EP0338412A2
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EP
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Color liquid crystal display device and method for driving same
Assignee: AGC Inc
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Filing: 1989-04-13
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Granted: —
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Expires: 2009-04-13
Abstract
Abstract A color liquid crystal display device comprising light shielding layers (4) and color filters (3) on the inner surface of a cell, wherein similar light shielding layers and color filters are disposed also in a peripheral region outside of a display region which is equipped with groups of striped row and column electrodes (10) opposed mutually to form pixels for display. The respective patterns of the light shielding layers and the color filters are the same in both the display region and the peripheral region. A liquid crystal layer formed in the display device has a twist angle of 160° to 300°, and a retardation compensator composed of a film is superposed on such layer so as to compensate the elliptical polarization. And a non-selective voltage is applied continuously to the scanning electrodes in the peripheral region so as to maintain the peripheral pixels in a light-shielded state, thereby rendering the display easier to be seen. Furthermore, due to overlaps of the color filters and the light shielding layers in both the display region and the peripheral region, the gap between the substrates (8) is retained substantially uniform to minimize the nonuniformity of the backgroud color.
Inventors
- 👤 Masao Ohgawara
- 👤 Hiroyoshi Tsubota
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 09:58
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133509; G02F1/133512; G02F1/133514; G02F1/1343; G02F1/134309; G02F1/134336
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
50 words
A color liquid crystal display device comprising light shielding layers and color filters on the inner surface of a cell, wherein similar light shielding layers and color filters are disposed also in a peripheral region outside of a display region equipped with groups of mutually opposed electrodes to perform display.
Claim 2
Dependent Claim
50 words
A color liquid crystal display device comprising light shielding layers and color filters on the inner surface of a cell, wherein similar light shielding layers and color filters are disposed also in a peripheral region outside of a display region equipped with groups of mutually opposed electrodes to perform display.
Claim 3
Dependent Claim
54 words
The color liquid crystal display device according to Claim 1, wherein said display region is a dot matrix type with striped electrode groups opposed to each other to form individual pixels and has color filters of at least two colors, and the adjacent pixels of different colors serve as one set to perform display.
Claim 4
Dependent Claim
126 words
The color liquid crystal display device according to Claim 1, wherein the light shielding layers are composed of thin films while the color filters are composed of thick films; and said display region equipped with groups of mutually opposed electrodes to perform display includes color filters disposed in the pixel portions thereof and also light shielding layers disposed between the pixels; and said peripheral region outside of said display region includes, over the entire surfce thereof, light shielding layers similar to those between the pixels in said display region and also color filters which are similar to those in the pixel portions of said display region and have an area corresponding to 50 to 100% of the area of the color filters in said display region.
Claim 5
Dependent Claim
84 words
The color liquid crystal display device according to Claim 1, wherein both the light shielding layers ard the color filters are composed of thick films; and said display region equipped with groups of mutually opposed electrodes to perform display includes color filters disposed in the pixel portions thereof and also light shielding layers disposed between the pixels; and said peripheral region outside of said display region includes similar light shielding layers and color filters of the same patterns as those in said display region.
Claim 6
Dependent Claim
122 words
The color liquid crystal dispaly device according to Claim 1, wherein both the light shielding layers and the color filters are composed of thick films; and said display region equipped with groups of mutually opposed electrodes to perform display includes color filters disposed in the pixel portions thereof and also light shielding layers disposed between the pixels; and said peripheral region outside of said display region includes, over the entire surface thereof, light shielding layers similar to those between the pixels in said display region and also color filters which are similar to those in the pixel portions of said display region and have an area corresponding to 5 to 50% of the area of the color filters in said display region.
Claim 7
Dependent Claim
29 words
The color liquid crystal display device according to Claim 1, wherein the substrates employed in said peripheral region are furnished with electrodes similar to those in said dispaly region.
Claim 8
Dependent Claim
46 words
The color liquid crystal display device according to Claim 1, wherein the liquid crystal layer thereof has a twist angle of 160° to 300°, and a retardation compensator is superposed on said liquid crystal layer so as to compensate the elliptical polarization derived from said layer.
Claim 9
Dependent Claim
21 words
The color liquid crystal display device according to Claim 7, wherein said retardation compensator is composed of a liquid crystal layer.
Claim 10
Dependent Claim
20 words
The color liquid crystal display device according to Claim 7, wherein said retardation compensator is composed of a retardation film.
Claim 11
Dependent Claim
50 words
A color liquid crystal display device comprising light shielding layers and color filters on the inner surface of a cell, wherein electrodes, light shielding layers and color filters are disposed also in a peripheral region outside of a display region euqipped with groups of mutually opposed electrodes to perform display.
Claim 12
Dependent Claim
50 words
A color liquid crystal display device comprising light shielding layers and color filters on the inner surface of a cell, wherein electrodes, light shielding layers and color filters are disposed also in a peripheral region outside of a display region euqipped with groups of mutually opposed electrodes to perform display.
Claim 13
Dependent Claim
35 words
The color liquid crystal display device according to Claim 10, wherein the electrodes, the light shielding layers and the color filters disposed in said display region and said peripheral region have the same pattern respectively.
Claim 14
Dependent Claim
34 words
A method for driving the color liquid crystal display device defined in Claim 10, wherein a voltage is applied continuously to said peripheral region so as to maintain the same in a light-shielded state.
Claim 15
Dependent Claim
27 words
The color liquid crystal display device driving method according to Claim 12, wherein a non-selective voltage is applied continuously to the scanning electrodes in said peripheral region.
Claim 16
Dependent Claim
109 words
A color liquid crystal display device comprising light shielding layers and color filters on the inner surface of a cell with a driving circuit, wherein a display region equipped with groups of mutually opposed electrodes to perform display includes color filters disposed in the pixel portions thereof and also light shielding layers disposed between the pixels; and a peripheral region outside of said display region includes light shielding layers and color filters of the same patterns as those in said display region, said peripheral region further including electrodes to which a voltage is applied continuously in such a manner as to maintain the peripheral pixels in a light-shielded state.
Claim 17
Dependent Claim
109 words
A color liquid crystal display device comprising light shielding layers and color filters on the inner surface of a cell with a driving circuit, wherein a display region equipped with groups of mutually opposed electrodes to perform display includes color filters disposed in the pixel portions thereof and also light shielding layers disposed between the pixels; and a peripheral region outside of said display region includes light shielding layers and color filters of the same patterns as those in said display region, said peripheral region further including electrodes to which a voltage is applied continuously in such a manner as to maintain the peripheral pixels in a light-shielded state.
Claim 18
Dependent Claim
45 words
The color liquid crystal display device according to Claim 14, wherein a back light is provided on the reverse side thereof, and a non-selective voltage is applied to the electrodes in said peripheral region for enabling said LCD device to function as a negative type.
References Cited (Backward Citations)
No citation records indexed.
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