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US4080046A
Expired / Lapsed
US
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Field-effect mode liquid crystal display displaying images in complementary colors
Assignee: Sharp Corp
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Filing: 1976-05-24
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Granted: 1978-03-21
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Expires: 1996-05-24
Abstract
Abstract In combination with a field-effect mode liquid crystal display which comprises a pair of polarizers and a field-effect mode liquid crystal display cell containing a liquid crystal composition having positive dielectric anisotropy characteristics, a retardation plate is placed between the liquid crystal display cell and one of the polarizers. The retardation plate creates phase differences of discriminative degrees in dependence on the differences of the wave length of the light passing therethrough. The images appear in one color on the complementary color background.
Inventors
- 👤 Masashi Nishizaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:04
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/13363; G02F1/133637; G02F1/137; G02F1/139; G02F1/1396; G02F2413/00; G02F2413/01; G02F2413/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
123 words
In field-effect mode liquid crystal display which comprises a pair of polarizers and a liquid crystal display cell sandwiched between the pair of polarizers, the liquid crystal display cell exhibiting a molecular alignment of a twisted nematic construction when it is unactivated and a molecular alignment of a homeotropic construction when it is activated, the improvement comprising: a retardation plate disposed between the liquid crystal display cell and one of the polarizers; said retardation plate being corrugated along a predetermined corrugation axis; said display cell being traversed by said corrugation axis and providing display images of contrasting colors at different relative positions thereon; and the contrasting colors of said display images being dependent upon the position of said images on said corrugation axis.
Claim 2
Dependent Claim
123 words
In field-effect mode liquid crystal display which comprises a pair of polarizers and a liquid crystal display cell sandwiched between the pair of polarizers, the liquid crystal display cell exhibiting a molecular alignment of a twisted nematic construction when it is unactivated and a molecular alignment of a homeotropic construction when it is activated, the improvement comprising: a retardation plate disposed between the liquid crystal display cell and one of the polarizers; said retardation plate being corrugated along a predetermined corrugation axis; said display cell being traversed by said corrugation axis and providing display images of contrasting colors at different relative positions thereon; and the contrasting colors of said display images being dependent upon the position of said images on said corrugation axis.
Claim 3
Dependent Claim
55 words
The field-effect mode liquid crystal display of claim 1, wherein the pair of polarizers are linear polarizers having planes of the polarization crossing each other at a right angle, and the retardation plate determines a pair of crossing planes respective of which cross the planes of the polarization determined by the linear polarizers at 45°.
Claim 4
Dependent Claim
27 words
The field-effect mode liquid crystal display of claim 1, wherein the retardation plate creates different phase differences as the wave length of the light passing therethrough varies.
Claim 5
Dependent Claim
21 words
The field-effect mode liquid crystal display of claim 1, wherein the retardation plate is made of a biaxially oriented polyester film.
Claim 6
Dependent Claim
21 words
The field-effect mode liquid crystal display of claim 1, wherein the retardation plate is made of a biaxially oriented polypropylene film.
Claim 7
Dependent Claim
21 words
The field-effect mode liquid crystal display of claim 5, wherein the biaxially oriented polypropylene film has thickness of 20μm to 60μm.
Claim 8
Dependent Claim
20 words
The field-effect mode liquid crystal display of claim 5, wherein the biaxially oriented polypropylene film has thickness of about 60μm.
References Cited (Backward Citations)
US2423371A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-20 | 1981-09-19 | 1982-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-20 | 1985-09-19 | 1986-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-20 | 1989-09-19 | 1990-03-21 | $7700.00 | Window Closed / Lapsed |