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US4842377A
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Liquid crystal device having "dummy" thin-film transistors as spacers
Assignee: Alps Alpine Co Ltd
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Filing: 1988-04-12
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Granted: 1989-06-27
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Expires: 2008-04-12
Abstract
Abstract A liquid crystal device includes a pair of first and second opposed substrates, a ferroelectric liquid crystal filled in a space defined between both the substrates, and a thin film transistor formed on at least one of the substrates. The thin film transistor is used as a spacer between the substrates, and the spacer is bonded to the first substrate opposed to the second substrate on which the spacer is formed. In another aspect, a dummy corresponding to the thin film transistor is further provided on the substrate on which the thin film transistor is formed, wherein the dummy is used as a spacer.
Inventors
- 👤 Jun Nakanowatari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:15
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1339; G02F1/13394; G02F1/136; G02F1/1362; G02F1/1368; G02F1/13392
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
In a liquid crystal device having a pair of first and second opposed substrates, a ferroelectric liquid crystal filled in a space defined between said substrates, and a thin film transistor formed on at least one of said substrates; the improvement comprising a dummy corresponding to said thin film transistor being formed on said substrate on which said thin film transistor is formed comprising a pseudo pixel electrode electrically insulated from said thin film transistor, and a pseudo thin film transistor; a thickness of said dummy is equal to the sum of a thickness of said thin film transistor and thickness of said pseudo pixel electrode, wherein said dummy is used as a spacer between said substrates, and said dummy is bonded to said first substrate opposed to said second substrate on which said dummy is formed.
Claim 2
Dependent Claim
137 words
In a liquid crystal device having a pair of first and second opposed substrates, a ferroelectric liquid crystal filled in a space defined between said substrates, and a thin film transistor formed on at least one of said substrates; the improvement comprising a dummy corresponding to said thin film transistor being formed on said substrate on which said thin film transistor is formed comprising a pseudo pixel electrode electrically insulated from said thin film transistor, and a pseudo thin film transistor; a thickness of said dummy is equal to the sum of a thickness of said thin film transistor and thickness of said pseudo pixel electrode, wherein said dummy is used as a spacer between said substrates, and said dummy is bonded to said first substrate opposed to said second substrate on which said dummy is formed.
References Cited (Backward Citations)
US4448491A
Cited
US4561726A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |