US5054889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display having an alignment layer in the form of a porous alumina layer
Assignee: Yamaha Corp
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Filing: 1990-02-08
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Granted: 1991-10-08
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Expires: 2010-02-08
Abstract
Abstract In construction of a liquid crystal display including an alignment film and generally used for video display panels such as television sets, the orientation wafer is given in the form of a porous alumina layer. Substantially vertical molecular orientation is resulted from penetration of liquid crystal molecules into pores in the alignment film. Optical application of rubbing process in production enables free adjustment of the value of pretilt angle. Good reproduction and stability is assured even in the case of large fields of vision.
Inventors
- 👤 Masao Imanishi
- 👤 Atsushi Ohtaka
- 👤 Kunio Hiyama
- 👤 Takanori Kawamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:03
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
48 words
A liquid crystal display comprising: a substrate; an electrode layer; and an alignment layer given in the form of a porous alumina layer; a liquid crystal layer, said substrate, electrode layer, liquid crystal layer and alignment layer being coupled to one another to form a liquid crystal display.
Claim 2
Dependent Claim
48 words
A liquid crystal display comprising: a substrate; an electrode layer; and an alignment layer given in the form of a porous alumina layer; a liquid crystal layer, said substrate, electrode layer, liquid crystal layer and alignment layer being coupled to one another to form a liquid crystal display.
Claim 3
Dependent Claim
22 words
A liquid crystal display as claimed in claim 1 in which said alignment layer is subjected to rubbing process during its production.
Claim 4
Dependent Claim
27 words
A liquid crystal display as claimed in claim 1 in which the thickness of said alignment layer is in a range from 5 nm to 5 μm.
Claim 5
Dependent Claim
35 words
A liquid crystal display as claimed in claim 1 in which said porous alumina layer has pores formed therein and the diameter of said pores is in a range from 10 to several ten nm.
Claim 6
Dependent Claim
27 words
A liquid crystal display as claimed in claim 2 in which the thickness of said alignment layer is in a range from 5 nm to 5 μm.
Claim 7
Dependent Claim
25 words
A liquid crystal display as claimed in claim 2 in which said porous alumina layer has pores formed therein and the diameter of said pores
References Cited (Backward Citations)
US4883344A
Cited
US4917472A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-10-07 | 1995-04-08 | 1995-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-07 | 1999-04-08 | 1999-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-07 | 2003-04-08 | 2003-10-08 | $7700.00 | Window Closed / Lapsed |