US5121238A
Expired / Lapsed
US
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Liquid crystal device
Assignee: Semiconductor Energy Laboratory Co Ltd
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Filing: 1989-10-11
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Granted: 1992-06-09
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Expires: 2009-10-11
Abstract
Abstract A liquid crystal display wherein chromatic aberration is reduced by superimposing an anisotropic film on a ferroelectric liquid crystal where the anisotropic film is located between a pair of polarizing plates and is selected from the group consisting of polycarbonates, polyvinylalcohol, polyacetates, polyethylene, polyester, polyimides, polyamides, polyvinylchloride, and polystyrene.
Inventors
- 👤 Akio Osabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:04
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/13363; G02F1/137; G02F1/139; G02F1/141; G02F2413/00; G02F2413/01
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
97 words
A liquid crystal device comprising: (a) a liquid crystal cell comprising: a pair of substrates at least one of which is transparent; a ferroelectric liquid crystal layer disposed between said substrates; and an electrode arrangement formed on the inside surfaces of said substrates in order to apply an electric field to said liquid crystal layer; (b) a pair of polarizing plates disposed on both sides of said liquid crystal cell; and (c) at least one anisotropic film disposed between at least one of the polarizing plates and said liquid crystal cell, wherein said anisotropic film comprises polycarbonate.
Claim 2
Dependent Claim
97 words
A liquid crystal device comprising: (a) a liquid crystal cell comprising: a pair of substrates at least one of which is transparent; a ferroelectric liquid crystal layer disposed between said substrates; and an electrode arrangement formed on the inside surfaces of said substrates in order to apply an electric field to said liquid crystal layer; (b) a pair of polarizing plates disposed on both sides of said liquid crystal cell; and (c) at least one anisotropic film disposed between at least one of the polarizing plates and said liquid crystal cell, wherein said anisotropic film comprises polycarbonate.
Claim 3
Dependent Claim
27 words
The display of claim 1 wherein said anisotropic film is a polymer film which have been elongated in one direction in order to possess a birefringence property.
Claim 4
Dependent Claim
21 words
The display of claim 1 wherein said thickness of said liquid crystal layer is from 2 micrometers to 5 PG,14 micrometers.
Claim 5
Dependent Claim
29 words
The display of claim 1 wherein the total phase difference of said liquid crystal layer and said anisotropic film is from 2.0 to 3.14 with respect to visual light.
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) | 1995-06-09 | 1995-12-09 | 1996-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-09 | 1999-12-09 | 2000-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-09 | 2003-12-09 | 2004-06-09 | $7700.00 | Window Closed / Lapsed |