US4579425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiplexable liquid crystal display with reduced hysteresis
Assignee: Sharp Corp
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Filing: 1983-07-26
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Granted: 1986-04-01
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Expires: 2003-07-26
Abstract
Abstract A liquid crystal display with multiplex capability enhanced by decreasing the hysteresis characteristic of the liquid crystal. The hysteresis characteristic of the crystal is reduced by fixing an angle of twist of the liquid crystal molecules in the range of 270 to 315 degrees, by setting a birefringence (ΔN) of the host molecules at less than or equal to 0.14 and by having a crystal layer thickness (d) of less than or equal to 7 μm (Δn·d<1 μm).
Inventors
- 👤 Yutaka Ishii
- 👤 Shuichi Kozaki
- 👤 Kenichi Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:39
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/13725; G02F1/13731; G02F1/13737; G02F1/139; G02F1/1396; G02F1/1397
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
67 words
A liquid crystal display, comprising: first and second substrates; and a liquid crystal layer, between said first and second substrates, having a twist angle in a range of 270 to 315 degrees in the absence of an applied electric field, having host liquid crystal molecules with a birefringence (Δn) less than or equal to 0.14 and having a thickness (d) less than or equal to 7 μm.
Claim 2
Dependent Claim
67 words
A liquid crystal display, comprising: first and second substrates; and a liquid crystal layer, between said first and second substrates, having a twist angle in a range of 270 to 315 degrees in the absence of an applied electric field, having host liquid crystal molecules with a birefringence (Δn) less than or equal to 0.14 and having a thickness (d) less than or equal to 7 μm.
Claim 3
Dependent Claim
30 words
A liquid crystal display as recited in claim 1, wherein said liquid crystal has a positive dielectric anisotropy and has added thereto an optically active material and a dichroic dye.
Claim 4
Dependent Claim
60 words
A liquid crystal display, comprising: first and second substrates; and a field effect mode liquid crystal layer between said first and second substrates having a twist angle in the range of 270 to 315 degrees in the absence of an applied electric field, and said liquid crystal layer having a thickness (d) of less than or equal to 7 μm.
Claim 5
Dependent Claim
60 words
A liquid crystal display, comprising: first and second substrates; and a field effect mode liquid crystal layer between said first and second substrates having a twist angle in the range of 270 to 315 degrees in the absence of an applied electric field, and said liquid crystal layer having a thickness (d) of less than or equal to 7 μm.
Claim 6
Dependent Claim
61 words
A liquid crystal display, comprising: first and second substrates; and a field effect mode liquid crystal layer between said first and second substrates having a twist angle in the range of 270 to 315 degrees in the absence of an applied electric field, and said liquid crystal layer having host molecules with a birefringence (Δn) less than or equal to 0.14.
Claim 7
Dependent Claim
61 words
A liquid crystal display, comprising: first and second substrates; and a field effect mode liquid crystal layer between said first and second substrates having a twist angle in the range of 270 to 315 degrees in the absence of an applied electric field, and said liquid crystal layer having host molecules with a birefringence (Δn) less than or equal to 0.14.
Claim 8
Dependent Claim
66 words
A liquid crystal display, comprising: first and second substrates; and a field effect mode liquid crystal layer between said first and second substrates having a twist angle in the range of 270 to 315 degrees in the absence of an applied electric field, and said liquid crystal layer having Δn·d less than 1.0 μm where Δn indicates a birefringence of host molecules and d indicates thickness.
Claim 9
Dependent Claim
66 words
A liquid crystal display, comprising: first and second substrates; and a field effect mode liquid crystal layer between said first and second substrates having a twist angle in the range of 270 to 315 degrees in the absence of an applied electric field, and said liquid crystal layer having Δn·d less than 1.0 μm where Δn indicates a birefringence of host molecules and d indicates thickness.
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) | 1989-03-31 | 1989-09-30 | 1990-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-31 | 1993-09-30 | 1994-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-31 | 1997-09-30 | 1998-04-01 | $7700.00 | Window Closed / Lapsed |