US4039252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Field-effect liquid crystal-type display device
Assignee: ENERGY SYSTEMS Ltd
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Filing: 1975-04-25
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Granted: 1977-08-02
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Expires: 1995-04-25
Abstract
Abstract A field-effect liquid-crystal type display device employing a twisted alignment method is provided with a pair of electrode glass plates spaced apart from each other and a field-effect type liquid crystal with a positive dielectric anisotropy loaded in the space defined by the plates, the plates being disposed in such a manner that an angle formed by the alignment treatment directions of the plates is changed a proper angle from 90°, so that the twisting direction of molecules in the liquid crystal is unified and the liquid crystal type display device is improved to show homogeneity, and thus to reduce the number of dirty domains or spots in display.
Inventors
- 👤 Fumio Mizuno
- 👤 Fumio Takeuchi
- 👤 Shunsuke Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:20
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/139; G02F1/1396
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A liquid crystal type display device comprising a pair of transparent members provided with transparent electrodes, respectively, and a liquid crystal of a field-effect type loaded in the space formed by the transparent members, said transparent members being disposed in such a manner that the angle formed by the alignment treatment directions of the transparent members is changed by five degrees from ninety degrees, whereby the homogeneity of the display is significantly improved from that obtained when the twist angle is less than five degrees or more than 10°, from 90°.
Claim 2
Dependent Claim
91 words
A liquid crystal type display device comprising a pair of transparent members provided with transparent electrodes, respectively, and a liquid crystal of a field-effect type loaded in the space formed by the transparent members, said transparent members being disposed in such a manner that the angle formed by the alignment treatment directions of the transparent members is changed by five degrees from ninety degrees, whereby the homogeneity of the display is significantly improved from that obtained when the twist angle is less than five degrees or more than 10°, from 90°.
References Cited (Backward Citations)
US3731986A
Cited
US3947185A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |