US4877309A
Expired / Lapsed
US
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Color liquid crystal display unit
Assignee: Sharp Corp
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Filing: 1987-12-08
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Granted: 1989-10-31
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Expires: 2007-12-08
Abstract
Abstract A color liquid crystal display device is composed of first and second liquid crystal display cells aligned over each other, in which each cell includes a pair of color polarizers having respective polarization axes which are oriented at right angles to each other. The color polarizers of each cell contain at least one color which is the complement of the color contained in the other color polarizer. In this way, display contrast and brightness can be enhanced by allowing a higher ratio of picture elements to be utilized for monochromatic displays.
Inventors
- 👤 Toshiaki Takamatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:10
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133509; G02F1/133514; G02F1/1347; G02F1/13471; G02F1/13473; G02F1/13475; G02F1/133528; G02F1/133533
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
203 words
A color liquid crystal display device, comprising: a first liquid crystal display cell having a liquid crystal material disposed between first and second substrates; first and second color polarizers disposed over said second substrate, said first and second color polarizers each containing at least one color which is the complement of the color contained by the other color polarizer, and having polarization axes oriented at right angles to each other; a second liquid crystal display cell having a liquid crystal material disposed between said second substrate and a third substrate and having picture elements aligned with said first display cell; third and fourth color polarizers disposed over said third substrate, said third and fourth color polarizers each containing at least one color which is the complement of the color contained by the other color polarizer and which is different from the colors contained by said first and second color polarizers of corresponding picture elements, and having polarization axes oriented at right angles to each other; and a neutral polarizer having a polarization axis parallel to a predetermined polarization axis of one of said first and second, and said third and fourth color polarizers, disposed on an incident light side of said first substrate.
Claim 2
Dependent Claim
203 words
A color liquid crystal display device, comprising: a first liquid crystal display cell having a liquid crystal material disposed between first and second substrates; first and second color polarizers disposed over said second substrate, said first and second color polarizers each containing at least one color which is the complement of the color contained by the other color polarizer, and having polarization axes oriented at right angles to each other; a second liquid crystal display cell having a liquid crystal material disposed between said second substrate and a third substrate and having picture elements aligned with said first display cell; third and fourth color polarizers disposed over said third substrate, said third and fourth color polarizers each containing at least one color which is the complement of the color contained by the other color polarizer and which is different from the colors contained by said first and second color polarizers of corresponding picture elements, and having polarization axes oriented at right angles to each other; and a neutral polarizer having a polarization axis parallel to a predetermined polarization axis of one of said first and second, and said third and fourth color polarizers, disposed on an incident light side of said first substrate.
Claim 3
Dependent Claim
20 words
The color liquid crystal display device of claim 1, wherein said first through fourth color polarizers each comprises two colors.
Claim 4
Dependent Claim
20 words
The color liquid crystal display device of claim 1, wherein said first through fourth color polarizers each comprises three colors.
Claim 5
Dependent Claim
20 words
The color liquid crystal display device of claim 1, wherein said first through fourth color polarizers each comprises one color.
Claim 6
Dependent Claim
147 words
A color liquid crystal display device, comprising: a first liquid crystal display cell having a liquid crystal material diposed between first and second substrates; a second liquid crystal display cell having a liquid crystal material disposed between said second substrate and a third substrate; picture elements of said first and second display cells being aligned; a pair of color polarizers disposed on each of said second and third substrates, each pair of color polarizers having polarization axes oriented at right angles to each other, each of said pair of color polarizers disposed on said second substrate containing at least one color which is complementary to a color contained by a corresponding color polarizer disposed on said third substrate; and a neutral polarizer having a polarization axis parallel to a predetermined one of said pairs of color polarizers disposed on an incident light side of said first substrate.
Claim 7
Dependent Claim
147 words
A color liquid crystal display device, comprising: a first liquid crystal display cell having a liquid crystal material diposed between first and second substrates; a second liquid crystal display cell having a liquid crystal material disposed between said second substrate and a third substrate; picture elements of said first and second display cells being aligned; a pair of color polarizers disposed on each of said second and third substrates, each pair of color polarizers having polarization axes oriented at right angles to each other, each of said pair of color polarizers disposed on said second substrate containing at least one color which is complementary to a color contained by a corresponding color polarizer disposed on said third substrate; and a neutral polarizer having a polarization axis parallel to a predetermined one of said pairs of color polarizers disposed on an incident light side of said first substrate.
Claim 8
Dependent Claim
45 words
The color liquid crystal display device of claim 5, wherein the pair of color polarizers disposed on said second substrate comprise the colors red, green and blue, and the pair of color polarizers disposed on said third substrate comprise the colors cyan, magenta and yellow.
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) | 1992-10-30 | 1993-05-01 | 1993-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-30 | 1997-05-01 | 1997-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-30 | 2001-05-01 | 2001-10-31 | $7700.00 | Window Closed / Lapsed |