Patent US4642619A successfully refreshed from Google Patents.
US4642619A
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Non-light-emitting liquid crystal color display device
Assignee: Citizen Watch Co Ltd
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Filing: 1983-12-14
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Granted: 1987-02-10
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Expires: 2003-12-14
Abstract
Abstract A color display device of the type having a plurality of light-transmissible and non-light-emitting picture elements such as liquid crystal display. The plurality of non-light-emitting picture elements for red, green and blue are arranged in checked arrangement. The number of the picture elements for green is larger than each of the other picture elements for red and blue and the total intensity of transmitting light at each of picture elements for said three colors is equal to each of the other picture elements, respectively. The number of picture elements for green is, for example, twice as many as either one of the other picture elements.
Inventors
- 👤 Seigo Togashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:18
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133509; G02F1/133514; G02F2201/00; G02F2201/52
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
106 words
In a color display device of the type having a plurality of light-transmissible picture elements for red, green and blue and means for selectively driving each element according to picture signals, wherein the improvement comprises: the number of picture elements for green on the entire display being larger than each of the other picture elements for red and blue on the entire display, the total intensity of transmitting light in the green picture elements being equal to each of the other picture elements, the surface of each picture element for green being square and the surface of each of the other picture elements being octagonal, and
Claim 2
Dependent Claim
106 words
In a color display device of the type having a plurality of light-transmissible picture elements for red, green and blue and means for selectively driving each element according to picture signals, wherein the improvement comprises: the number of picture elements for green on the entire display being larger than each of the other picture elements for red and blue on the entire display, the total intensity of transmitting light in the green picture elements being equal to each of the other picture elements, the surface of each picture element for green being square and the surface of each of the other picture elements being octagonal, and
Claim 3
Dependent Claim
16 words
the picture elements for green being disposed in a checkered arrangement interposing the other picture elements.
Claim 4
Dependent Claim
16 words
the picture elements for green being disposed in a checkered arrangement interposing the other picture elements.
Claim 5
Dependent Claim
55 words
The color display device according to claim 1, wherein the total number of picture elements for green is twice that of either one of the other total picture element colors, wherein the total area of the picture elements for green being approximately one-half the sum total of the areas of red and blue picture elements.
Claim 6
Dependent Claim
19 words
The color display device according to claim 1, wherein said picture elements are filters for red, green, and blue.
Claim 7
Dependent Claim
27 words
The color display device according to claim 3, wherein the transmission coefficient of the filter for green is lower than the filters for either red or blue.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-09 | 1990-08-11 | 1991-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-09 | 1994-08-11 | 1995-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-09 | 1998-08-11 | 1999-02-10 | $7700.00 | Window Closed / Lapsed |