US4643530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reflective, thin film transistor addressed, matrix liquid crystal display
Assignee: Seiko Instruments Inc
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Filing: 1983-05-25
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Granted: 1987-02-17
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Expires: 2003-05-25
Abstract
Abstract A matrix liquid crystal display device comprising a reflecting plate and a polarizing plate coated on an insulating substrate, a thin film transistor arranged on the insulating substrate in matrix configuration, and a liquid crystal sandwiched between the insulating substrate and a glass plate. A cross-talk between picture elements caused by transmission or reflection of light on the substrate is prevented. The thin film transistor is formed by a semiconductor film made of amorphous silicon or a gate insulating film made of silicon dioxide which is easily formed at low temperature under 40° C. by plasma CVD method or the like.
Inventors
- 👤 Tsuneo Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:23
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/136; G02F1/1362; G02F1/1368; G02F1/1333; G02F1/1335; G02F1/133528; G02F1/136213; G02F2202/00; G02F2202/10; G02F2202/103
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
143 words
A matrix liquid crystal display device comprising: a reflecting layer formed on a substrate; a first polarizing layer formed on said reflecting layer, said reflecting layer being sandwiched between said first polarizing layer and said substrate; thin film transistors and condensers arranged on said first polarizing layer in a two-dimensional matrix configuration, said first polarizing layer being sandwiched between said reflecting layer and said matrix configuration of thin film transistors and condensers; a transparent plate having opposed major surfaces and being spaced from the matrix configuration of thin film transistors and condensers; a transparent electrode formed on the major surface of said transparent plate which faces said first polarizing layer; a liquid crystal layer sandwiched between said first polarizing layer and said transparent electrode; and a second polarizing layer disposed on the same side of the liquid crystal layer as said transparent plate.
Claim 2
Dependent Claim
143 words
A matrix liquid crystal display device comprising: a reflecting layer formed on a substrate; a first polarizing layer formed on said reflecting layer, said reflecting layer being sandwiched between said first polarizing layer and said substrate; thin film transistors and condensers arranged on said first polarizing layer in a two-dimensional matrix configuration, said first polarizing layer being sandwiched between said reflecting layer and said matrix configuration of thin film transistors and condensers; a transparent plate having opposed major surfaces and being spaced from the matrix configuration of thin film transistors and condensers; a transparent electrode formed on the major surface of said transparent plate which faces said first polarizing layer; a liquid crystal layer sandwiched between said first polarizing layer and said transparent electrode; and a second polarizing layer disposed on the same side of the liquid crystal layer as said transparent plate.
Claim 3
Dependent Claim
25 words
A matrix liquis crystal display device as claimed in claim 1; wherein said liquid crystal comprises an electric field effect twisted nematic type liquid crystal.
Claim 4
Dependent Claim
28 words
A matrix liquid crystal display device as claimed in claim 1; wherein each thin film transistor comprises an insulating gate type field effect transistor composed of amorphous silicon.
Claim 5
Dependent Claim
28 words
A matrix liquid crystal display device as claimed in claim 1; wherein each thin film transistor comprises an insulating gate type field effect transistor composed of polycrystalline silicon.
Claim 6
Dependent Claim
18 words
A matrix liquid crystal display device as claimed in claim 1; wherein said substrate comprises a glass plate.
Claim 7
Dependent Claim
24 words
A matrix liquid crystal display device as claimed in claim 4; wherein said reflecting layer comprises a metal plate having a reflecting inner surface.
Claim 8
Dependent Claim
19 words
A matrix liquid crystal display device as claimed in claim 4; wherein said reflecting layer comprises a metal film.
Claim 9
Dependent Claim
145 words
In a matrix liquid crystal display device: means defining a light-reflecting surface; a first polarizing layer formed on the light-reflecting surface; an array of thin film transistors and driving elements arranged in a two-dimensional matrix on the first polarizing layer, the first polarizing layer being sandwiched between the light-reflecting surface and the array of thin film transistors and driving elements, each driving element corresponding to one thin film transistor and having a first transparent electrode; a transparent plate having opposed major surfaces and being spaced-apart from the array of thin film transistors and driving elements; a second transparent electrode formed on the major surface of the transparent plate which faces the first polarizing layer; a liquid crystal material interposed between the first and second transparent electrodes; and a second polarizing layer disposed on the same side of the liquid crystal material as the transparent plate.
Claim 10
Dependent Claim
145 words
In a matrix liquid crystal display device: means defining a light-reflecting surface; a first polarizing layer formed on the light-reflecting surface; an array of thin film transistors and driving elements arranged in a two-dimensional matrix on the first polarizing layer, the first polarizing layer being sandwiched between the light-reflecting surface and the array of thin film transistors and driving elements, each driving element corresponding to one thin film transistor and having a first transparent electrode; a transparent plate having opposed major surfaces and being spaced-apart from the array of thin film transistors and driving elements; a second transparent electrode formed on the major surface of the transparent plate which faces the first polarizing layer; a liquid crystal material interposed between the first and second transparent electrodes; and a second polarizing layer disposed on the same side of the liquid crystal material as the transparent plate.
Claim 11
Dependent Claim
25 words
A matrix liquid crystal display device according to claim 8; wherein the liquid crystal material comprises an electric field effect twisted nematic type liquid crystal.
Claim 12
Dependent Claim
21 words
A matrix liquid crystal display device according to claim 8; wherein the liquid crystal material comprises a guest-host type liquid crystal.
Claim 13
Dependent Claim
23 words
A matrix liquid crystal display device according to claim 8; wherein the first polarizing layer has a thickness no greater than 10 μm.
Claim 14
Dependent Claim
25 words
A matrix liquid crystal display device according to claim 11; including a substrate having an inner major surface on which is formed the light-reflecting surface.
Claim 15
Dependent Claim
17 words
A matrix liquid crystal display device according to claim 9; wherein the substrate comprises a glass plate.
Claim 16
Dependent Claim
33 words
A matrix liquid crystal display device according to claim 12; wherein the substrate comprises a metal plate, and the means defining a light-reflecting surface comprises a light-reflecting major surface of the metal plate.
Claim 17
Dependent Claim
24 words
A matrix liquid crystal display device according to claim 8; including a substrate having a major surface on which is formed the light-reflecting surface.
Claim 18
Dependent Claim
17 words
A matrix liquid crystal display device according to claim 15; wherein the substrate comprises a glass plate.
Claim 19
Dependent Claim
33 words
A matrix liquid crystal display device according to claim 15; wherein the substrate comprises a metal plate, and the means defining a light-reflecting surface comprises a light-reflecting major surface of the metal plate.
Claim 20
Dependent Claim
27 words
A matrix liquid crystal display device according to claim 8; wherein each thin film transistor comprises an insulating gate type field effect transistor composed of amorphous silicon.
Claim 21
Dependent Claim
27 words
A matrix liquid crystal display device according to claim 8; wherein each thin film transistor comprises an insulating gate type field effect transistor composed of polycrystalline silicon.
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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) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |