US4426133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Twisted nematic liquid crystal display panel
Assignee: Sharp Corp
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Filing: 1980-12-23
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Granted: 1984-01-17
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Expires: 2000-12-23
Abstract
Abstract A twisted nematic liquid crystal is characterized in that the direction of longitudinal axes of liquid crystal molecules adjacent each of a pair of polarizers is deviated with respect to the orientation vector of each of the polarizers in order to improve display contrast ratio.
Inventors
- 👤 Fumiaki Funada
- 👤 Shigehiro Minezaki
- 👤 Syuichi Kozaki
- 👤 Hisashi Uede
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:23
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/139; G02F1/1396; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133528; G02F1/133531
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
173 words
A twisted nematic liquid crystal display cell comprising first and second substrates, first and second polarizers associated with the first and second substrates, respectively, a liquid crystal material between said substrates, wherein the longitudinal axes of molecules of the liquid crystal material are twisted by substantially 90 degrees between the first and the second substrates, characterized in that: a first angle A P is substantially 74° to 84°, a second angle P r p is substantially 3° to 8°, and a third angle A r A is substantially -3° to -8° wherein the positive direction of angular rotation is defined as the direction of the helical angle of the liquid crystal material, P and A are the polarization directions of the first and second polarizers, respectively, r P is the direction of the longitudinal axes of liquid crystal molecules adjacent the first polarizer having the direction of polarization P, and r A is the direction of the longitudinal axes of liquid crystal molecules adjacent the second polarizer having the direction of polarization A.
Claim 2
Dependent Claim
173 words
A twisted nematic liquid crystal display cell comprising first and second substrates, first and second polarizers associated with the first and second substrates, respectively, a liquid crystal material between said substrates, wherein the longitudinal axes of molecules of the liquid crystal material are twisted by substantially 90 degrees between the first and the second substrates, characterized in that: a first angle A P is substantially 74° to 84°, a second angle P r p is substantially 3° to 8°, and a third angle A r A is substantially -3° to -8° wherein the positive direction of angular rotation is defined as the direction of the helical angle of the liquid crystal material, P and A are the polarization directions of the first and second polarizers, respectively, r P is the direction of the longitudinal axes of liquid crystal molecules adjacent the first polarizer having the direction of polarization P, and r A is the direction of the longitudinal axes of liquid crystal molecules adjacent the second polarizer having the direction of polarization A.
Claim 3
Dependent Claim
34 words
The display cell of claim 1, wherein the liquid crystal material is nematic liquid crystal having a positive dielectric anisotropy, or a cholesteric liquid crystal having a helical pitch of at least 40 μm.
Claim 4
Dependent Claim
18 words
The display cell of claim 1, wherein one of the first and second polarizers is a linear polarizer.
Claim 5
Dependent Claim
173 words
A twisted nematic liquid crystal display cell comprising first and second substrates, first and second polarizers associated with the first and second substrates, respectively, a liquid crystal material between said substrates, wherein the longitudinal axes of molecules of the liquid crystal material are twisted by substantially 90 degrees between the first and the second substrates, characterized in that: a first angle A P is substantially 74° to 84°, a second angle P r P is substantially 93° to 98°, and a third angle A r A is substantially 82° to 87°; wherein the positive direction of angular rotation is defined as the direction of the helical angle of the liquid crystal material, P and A are the polarization directions of the first and second polarizers, respectively, r P is the direction of the longitudinal axes of liquid crystal molecules adjacent the first polarizer having the direction of polarization P, and r A is the direction of the longitudinal axes of liquid crystal molecules adjacent the second polarizer having the direction of polarization A.
Claim 6
Dependent Claim
173 words
A twisted nematic liquid crystal display cell comprising first and second substrates, first and second polarizers associated with the first and second substrates, respectively, a liquid crystal material between said substrates, wherein the longitudinal axes of molecules of the liquid crystal material are twisted by substantially 90 degrees between the first and the second substrates, characterized in that: a first angle A P is substantially 74° to 84°, a second angle P r P is substantially 93° to 98°, and a third angle A r A is substantially 82° to 87°; wherein the positive direction of angular rotation is defined as the direction of the helical angle of the liquid crystal material, P and A are the polarization directions of the first and second polarizers, respectively, r P is the direction of the longitudinal axes of liquid crystal molecules adjacent the first polarizer having the direction of polarization P, and r A is the direction of the longitudinal axes of liquid crystal molecules adjacent the second polarizer having the direction of polarization A.
Claim 7
Dependent Claim
34 words
The display cell of claim 4, wherein the liquid crystal material is nematic liquid crystal having a positive dielectric anisotropy, or a cholesteric liquid crystal having a helical pitch of at least 40 μm.
Claim 8
Dependent Claim
18 words
The display cell of claim 4, wherein one of the first and second polarizers is a linear polarizer.
Claim 9
Dependent Claim
173 words
A twisted nematic liquid crystal display cell comprising first and second substrates, first and second polarizers associated with the first and second substrates, respectively, a liquid crystal material between said substrates, wherein the longitudinal axes of molecules of the liquid crystal material are twisted by substantially 90 degrees between the first and the second substrates, characterized in that: a first angle A P is substantially 74° to 84°, a second angle P r P is substantially -82° to -87°, and a third angle A r A is substantially -93° to -98°; wherein the positive direction of angular rotation is defined as the direction of the helical angle of the liquid crystal material, P and A are the polarization directions of the first and second polarizers, respectively, r P is the direction of the longitudinal axes of liquid crystal molecules adjacent the first polarizer having the direction of polarization P, and r A is the direction of the longitudinal axes of liquid crystal molecules adjacent the second polarizer having the direction of polarization A.
Claim 10
Dependent Claim
173 words
A twisted nematic liquid crystal display cell comprising first and second substrates, first and second polarizers associated with the first and second substrates, respectively, a liquid crystal material between said substrates, wherein the longitudinal axes of molecules of the liquid crystal material are twisted by substantially 90 degrees between the first and the second substrates, characterized in that: a first angle A P is substantially 74° to 84°, a second angle P r P is substantially -82° to -87°, and a third angle A r A is substantially -93° to -98°; wherein the positive direction of angular rotation is defined as the direction of the helical angle of the liquid crystal material, P and A are the polarization directions of the first and second polarizers, respectively, r P is the direction of the longitudinal axes of liquid crystal molecules adjacent the first polarizer having the direction of polarization P, and r A is the direction of the longitudinal axes of liquid crystal molecules adjacent the second polarizer having the direction of polarization A.
Claim 11
Dependent Claim
34 words
The display cell of claim 7, wherein the liquid crystal material is nematic liquid crystal having a positive dielectric anisotropy, or a cholesteric liquid crystal having a helical pitch of at least 40 μm.
Claim 12
Dependent Claim
18 words
The display cell of claim 7, wherein one of the first and second polarizers is a linear polarizer.
References Cited (Backward Citations)
US4039252A
Cited
US3947185A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-16 | 1987-07-18 | 1988-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-16 | 1991-07-18 | 1992-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-16 | 1995-07-18 | 1996-01-17 | $7700.00 | Window Closed / Lapsed |