US4711530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal device having birefringent plate next to polarizer
Assignee: Alps Alpine Co Ltd
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Filing: 1986-09-24
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Granted: 1987-12-08
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Expires: 2006-09-24
Abstract
Abstract A liquid crystal device comprising a liquid crystal cell in which a ferroelectric liquid crystal are put between two sheets transparent substrates each formed with a transparent electrode to the inside thereof with the peripheral edges of the transparent substrates being sealed, a polymer film having a birefringent property appended on one side of the liquid crystal cell and two polarizing plates disposed on both sides of the liquid crystal cell and such that the polarizing directions thereof are in perpendicular to or in parallel with each other. Coloring for the transmission light is suppressed, by which the display quality can be improved.
Inventors
- 👤 Jun Nakanowatari
- 👤 Mitsuru Kano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:05
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; G02F2413/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
87 words
A liquid crystal device comprising a liquid crystal cell in which a ferroelectric liquid crystal is put between two transparent substrates each formed with a transparent electrode to the inside thereof with the peripheral edges of said transparent substrates being sealed, a polymer film having a birefringent property appended on one side of said liquid crystal cell and two sheet polarizing plates disposed on both sides of said liquid crystal cell and such that the polarizing directions thereof are perpendicular to or in parallel with each other.
Claim 2
Dependent Claim
87 words
A liquid crystal device comprising a liquid crystal cell in which a ferroelectric liquid crystal is put between two transparent substrates each formed with a transparent electrode to the inside thereof with the peripheral edges of said transparent substrates being sealed, a polymer film having a birefringent property appended on one side of said liquid crystal cell and two sheet polarizing plates disposed on both sides of said liquid crystal cell and such that the polarizing directions thereof are perpendicular to or in parallel with each other.
Claim 3
Dependent Claim
54 words
The liquid crystal device as defined in claim 1, wherein the polymer film is disposed such that the optical axis thereof is deviated from the direction in parallel with or perpendicular to the polarizing axis of one of the polarizing plates by preferably from 1° to 20° and, more preferably, from 2° to 7°.
Claim 4
Dependent Claim
23 words
The liquid crystal device as defined in claim 1, wherein the film thickness of the polymer film is from 1 to 100 μm.
Claim 5
Dependent Claim
23 words
The liquid crystal device as defined in claim 3, wherein the film thickness of the polymer film is from 10 to 50 μm.
Claim 6
Dependent Claim
22 words
The liquid crystal device as defined in claim 1, wherein the polymer film is made of a monoaxially stretched polyethylene terephthalate film.
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) | 1990-12-07 | 1991-06-08 | 1991-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-07 | 1995-06-08 | 1995-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-07 | 1999-06-08 | 1999-12-08 | $7700.00 | Window Closed / Lapsed |