US5151808A
Expired / Lapsed
US
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Chiral smectic liquid crystal electro-optical device having domains for alignment smaller than a pixel
Assignee: Semiconductor Energy Laboratory Co Ltd
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Filing: 1990-10-31
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Granted: 1992-09-29
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Expires: 2010-10-31
Abstract
Abstract A liquid crystal display comprises a pair of substrates provided with an electrode arrangement in matrix form. A chiral smectic C phase liquid crystal material is interposed between the substrates. In the liquid crystal layer, each pixel consists of a number of micro-domains which can be compared to polycrystalline structures. Interaction between adjacent pixels through well ordered liquid crystal structure is suppressed by virtue of the micro-domains.
Inventors
- 👤 Shunpei Yamazaki
- 👤 Masahiko Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:52
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/139; G02F1/141
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
77 words
A liquid crystal device comprising: a pair of substrates; a chiral smectic liquid crystal layer interposed between said substrates; an electrode arrangement for applying an electric field to said liquid crystal layer; and an orientation control surface formed on at least one inside surface of said substrates; wherein said liquid crystal layer comprises a plurality of domains in each of which liquid crystal molecules are aligned in a direction which is determined by said orientation control surface.
Claim 2
Dependent Claim
77 words
A liquid crystal device comprising: a pair of substrates; a chiral smectic liquid crystal layer interposed between said substrates; an electrode arrangement for applying an electric field to said liquid crystal layer; and an orientation control surface formed on at least one inside surface of said substrates; wherein said liquid crystal layer comprises a plurality of domains in each of which liquid crystal molecules are aligned in a direction which is determined by said orientation control surface.
Claim 3
Dependent Claim
14 words
The device of claim 1 wherein said electrode arrangement defines pixels in matrix form.
Claim 4
Dependent Claim
38 words
The device of claim 2 wherein said matrix form includes a plurality of rows and columns and wherein said orientation control surface is adapted to orient the molecules of said liquid crystal layer in parallel with the columns.
Claim 5
Dependent Claim
31 words
The device of claim 3 wherein the average dimension of said domains with reference to the row direction is one or more orders of magnitude smaller than that of said pixel.
Claim 6
Dependent Claim
15 words
The device of claim 1 wherein said orientation control surface is given a rubbing treatment.
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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) | 1995-09-29 | 1996-03-30 | 1996-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-29 | 2000-03-30 | 2000-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-29 | 2004-03-30 | 2004-09-29 | $7700.00 | Window Closed / Lapsed |