US4217035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display
Assignee: Asulab AG
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Filing: 1977-06-10
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Granted: 1980-08-12
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Expires: 1997-06-10
Abstract
Abstract A liquid crystal display, and process of manufacture therefor, emloying an integrated reflector internal to the liquid crystal cell, and consisting of a guest-host liquid crystal layer sandwiched between two cell plates and located between front and rear electrodes. At least the front electrode is composed of segments and parts of the reflector and/or rear electrode that lie opposite the conduction paths leading to these segments are at an electrical potential whose difference from the potential of the conduction paths is smaller than the threshold voltage of the liquid crystal layer used.
Inventors
- 👤 Rino Doriguzzi
- 👤 Markus Egloff
- 👤 Meinolph Kaufmann
- 👤 Terry J. Scheffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:29
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133553; G04; G04G; G04G9/00; G04G9/0023; G02F1/137; G02F1/13725
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
106 words
In a liquid crystal display including a guest-host liquid crystal layer located between front and rear electrodes of front and rear cell plates, and an integrated reflector located between the front and rear cell plates, the improvement comprising: at least said front electrode composed of segments and conduction paths leading thereto, and said reflector comprising mutually insulating metal particles, each having an insulating oxide coating, deposited on the inner surface of the rear cell plate and the rear electrode, said insulated metal particles forming said reflector having a surface conductivity of at most 10 uS (micro Siemens) per square in the plane of the electrode surface.
Claim 2
Dependent Claim
106 words
In a liquid crystal display including a guest-host liquid crystal layer located between front and rear electrodes of front and rear cell plates, and an integrated reflector located between the front and rear cell plates, the improvement comprising: at least said front electrode composed of segments and conduction paths leading thereto, and said reflector comprising mutually insulating metal particles, each having an insulating oxide coating, deposited on the inner surface of the rear cell plate and the rear electrode, said insulated metal particles forming said reflector having a surface conductivity of at most 10 uS (micro Siemens) per square in the plane of the electrode surface.
Claim 3
Dependent Claim
32 words
A liquid crystal display as recited in claim 1, wherein: said insulating metal particles are aluminum pigment particles which are deposited in a coating that is from 0.2 to 50 μm thick.
Claim 4
Dependent Claim
53 words
A liquid crystal display as recited in claim 2, further comprising: a reflector which transmits at least a portion of any light impinging thereon, wherein said inuslating metal particles are from 2 to 12 μm long aluminum pigment particles which are deposited in a coating that is from 0.2 to 5 μm thick.
Claim 5
Dependent Claim
34 words
A liquid crystal display as recited in claim 1 wherein: from 1 to 5% glass frit powder having a particle size of from 0.1 to 5 μm is mixed with the insulating metal particles.
Claim 6
Dependent Claim
61 words
A liquid crystal display as recited in claim 1 wherein: non-conducting particles from the group consisting of CeO 2 , MgO, SiO 2 , SiO, TiO, TiO 2 , ZrO 2 , Al 2 O 3 , are mixed with the insulating metal particles; and, the largest dimension of said non-conducting particles corresponds to at least approximately the nominal cell spacing.
Claim 7
Dependent Claim
35 words
A liquid crystal display as recited in claim 1 wherein: 20 to 100 μm long glass fibers whose diameters correspond to the nominal spacing of the cell plates are mixed with the insulating metal particles.
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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) | 1983-08-12 | 1984-02-11 | 1984-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-12 | 1988-02-11 | 1988-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-12 | 1992-02-11 | 1992-08-12 | $7700.00 | Window Closed / Lapsed |