Patent US4930877A successfully refreshed from Google Patents.
US4930877A
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Liquid crystal display
Assignee: Onanovich Group AG LLC
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Filing: 1988-10-27
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Granted: 1990-06-05
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Expires: 2008-10-27
Abstract
Abstract A liquid crystal display includes a pair of substrates and a liquid crystal composition sealed between the substrates. The liquid crystal composition has a twist angle set within a range of 180-300 degrees and a retardation set within a range of 0.45-0.7, wherein when an electric field is applied, the liquid crystal display is in a dark state, while when the electric field is not applied, the liquid crystal display is in a bright state. A filter is laminated on the outside of the substrates, and it has a hue complementary to that of an image color of the liquid crystal display in the bright state.
Inventors
- 👤 Mitsuru Kano
- 👤 Kenji Miyagawa
- 👤 Masahiko Yamaguchi
- 👤 Eiji Imaizumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:16
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/139; G02F1/1396; G02F1/1397; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133509
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A liquid crystal display comprising a pair of substrates; a liquid crystal composition sealed between said substrates, said liquid crystal composition having a twist angle set within a range of 180-300 degrees and a retardation set within a range of 0.45-0.7 μm, wherein when an electric field is applied, said liquid crystal display is in a dark state, while when the electric field is not applied, said liquid crystal display is in a bright state; and a filter laminated on the outside of said substrates, said filter having a hue complementary to that of an image color of said liquid crystal display in the bright state.
Claim 2
Dependent Claim
106 words
A liquid crystal display comprising a pair of substrates; a liquid crystal composition sealed between said substrates, said liquid crystal composition having a twist angle set within a range of 180-300 degrees and a retardation set within a range of 0.45-0.7 μm, wherein when an electric field is applied, said liquid crystal display is in a dark state, while when the electric field is not applied, said liquid crystal display is in a bright state; and a filter laminated on the outside of said substrates, said filter having a hue complementary to that of an image color of said liquid crystal display in the bright state.
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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) | 1993-06-04 | 1993-12-04 | 1994-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-04 | 1997-12-04 | 1998-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-04 | 2001-12-04 | 2002-06-05 | $7700.00 | Window Closed / Lapsed |