Patent US5790219A successfully refreshed from Google Patents.
US5790219A
Expired / Lapsed
US
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Color liquid-crystal display panel with black-mask overlapping color-filter more on downwardly rubbing side of switching element
Assignee: Japan Display Central Inc
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Filing: 1995-10-12
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Granted: 1998-08-04
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Expires: 2015-10-12
Abstract
Abstract A color liquid-crystal display panel comprising switching elements, pixel electrodes, and feed wirings made of plural thinfilm layers deposited on the internal surface of one of the substrates, a color filter having an unevenness of more than 0.3 μm, a black mask, and a liquid-crystal layer disposed between said two substrates, wherein the length of overlap of the black-mask over the color filter for every pixel is slightly different at least in a direction within a plane parallel to said substrate in order to prevent the generation of inverse tilt domain in the rub-down area caused by an application of rubbing, attaining a high image quality without light leakage.
Inventors
- 👤 Nobuyasu Yamagishi
- 👤 Yoshitaka Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:15
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133509; G02F1/133512; G02F1/1337; G02F1/13373; G02F1/136; G02F1/1362; G02F1/136213
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
234 words
A color liquid-crystal display panel comprising: a first substrate having an inner surface; a second substrate having an inner surface facing the inner surface of the first substrate; switching elements; pixel electrodes on the inner surface of the first substrate; feed wiring disposed on the inner surface of the first substrate; color-filters having an unevenness of more than 0.3 μm disposed adjacent to each other on the inner surface of the second substrate, each color-filter facing a corresponding pixel electrode; a black-mask disposed on the inner surface of the second substrate, with black-mask sections between adjacent color-filters; and an orientation layer disposed on the inner surface of each of the two substrates; a liquid-crystal molecule layer sandwiched between the inner surfaces of the first and second substrates, wherein molecules in the liquid-crystal molecule layer are oriented along a predetermined direction by applying a rubbing to the orientation layer; and wherein for each pixel electrode the length of an overlap of the black-mask section on at least one side of the pixel electrode over the color-filter corresponding to the pixel electrode, in a cross-sectional view perpendicular to the inner surface of the first substrate, is greater than on the side opposite to the at least one side of said pixel electrode; and wherein the length of each overlap on the side of the protrusion where the rubbing is performed downwardly is greater than 10 μm.
Claim 2
Dependent Claim
234 words
A color liquid-crystal display panel comprising: a first substrate having an inner surface; a second substrate having an inner surface facing the inner surface of the first substrate; switching elements; pixel electrodes on the inner surface of the first substrate; feed wiring disposed on the inner surface of the first substrate; color-filters having an unevenness of more than 0.3 μm disposed adjacent to each other on the inner surface of the second substrate, each color-filter facing a corresponding pixel electrode; a black-mask disposed on the inner surface of the second substrate, with black-mask sections between adjacent color-filters; and an orientation layer disposed on the inner surface of each of the two substrates; a liquid-crystal molecule layer sandwiched between the inner surfaces of the first and second substrates, wherein molecules in the liquid-crystal molecule layer are oriented along a predetermined direction by applying a rubbing to the orientation layer; and wherein for each pixel electrode the length of an overlap of the black-mask section on at least one side of the pixel electrode over the color-filter corresponding to the pixel electrode, in a cross-sectional view perpendicular to the inner surface of the first substrate, is greater than on the side opposite to the at least one side of said pixel electrode; and wherein the length of each overlap on the side of the protrusion where the rubbing is performed downwardly is greater than 10 μm.
Claim 3
Dependent Claim
248 words
A color liquid-crystal display panel comprising: a first substrate having an inner surface; a second substrate having an inner surface facing the inner surface of the first substrate; pixel electrodes on the inner surface of the first substrate: protrusions on the inner surface of the first substrate, each protrusion containing a switching element; color-filters provided adjacent to each other on the inner surface of the second substrate, each color-filter facing a corresponding pixel electrode; a black-mask disposed on the inner surface of the second substrate, with black-mask sections between adjacent color-filters, and with each black mask section facing a corresponding protrusion; a liquid-crystal molecule layer sandwiched between the inner surface of the first substrate and the inner surface of the second substrate; and an orientation layer disposed over the inner surface of the first substrate and over the inner surface of the second substrate; and wherein molecules in the liquid-crystal molecule layer are oriented in a predetermined direction by applying a rubbing to the orientation layers; and wherein at each protrusion, in a cross-sectional view perpendicular to the inner surface of the first substrate, an overlap of the corresponding black-mask section over the color-filter on a side of the protrusion where the rubbing is performed downwardly is longer than over the color-filter on a side of the protrusion where the rubbing is performed upwardly; and wherein the length of each overlap on the side of the protrusion where the rubbing is performed downwardly is greater than 10 μm.
Claim 4
Dependent Claim
248 words
A color liquid-crystal display panel comprising: a first substrate having an inner surface; a second substrate having an inner surface facing the inner surface of the first substrate; pixel electrodes on the inner surface of the first substrate: protrusions on the inner surface of the first substrate, each protrusion containing a switching element; color-filters provided adjacent to each other on the inner surface of the second substrate, each color-filter facing a corresponding pixel electrode; a black-mask disposed on the inner surface of the second substrate, with black-mask sections between adjacent color-filters, and with each black mask section facing a corresponding protrusion; a liquid-crystal molecule layer sandwiched between the inner surface of the first substrate and the inner surface of the second substrate; and an orientation layer disposed over the inner surface of the first substrate and over the inner surface of the second substrate; and wherein molecules in the liquid-crystal molecule layer are oriented in a predetermined direction by applying a rubbing to the orientation layers; and wherein at each protrusion, in a cross-sectional view perpendicular to the inner surface of the first substrate, an overlap of the corresponding black-mask section over the color-filter on a side of the protrusion where the rubbing is performed downwardly is longer than over the color-filter on a side of the protrusion where the rubbing is performed upwardly; and wherein the length of each overlap on the side of the protrusion where the rubbing is performed downwardly is greater than 10 μm.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-08-03 | 2002-02-02 | 2002-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-08-03 | 2006-02-02 | 2006-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-08-03 | 2010-02-02 | 2010-08-04 | $7700.00 | Window Closed / Lapsed |