US5576077A
Expired / Lapsed
US
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Retardation layer having thin glass substrates
Assignee: Akzo Nobel NV
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Filing: 1994-09-26
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Granted: 1996-11-19
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Expires: 2014-09-26
Abstract
Abstract The present invention is in the field of retardation layers for liquid crystalline displays, more particularly in the field of retardation layers based on super-twisted nematic (STN) liquid crystalline layer. In the retardation layers of the present invention the liquid crystalline polymer is placed between glass substrates wherein at least one substrate has a thickness of 20-500 micrometers. The use of such thin glass substrates reduces the weight and thickness of the retardation layer. The LC polymer film may also be placed between the substrate of the display cell and a thin glass substrate or between the polarizer and a thin glass substrate. In these embodiments of the invention a second thin glass substrate is not necessary and the thickness and weight of the retardation layer is further reduced.
Inventors
- 👤 Martin Bosma
- 👤 Jan W. Venema
- 👤 Stephen J. Picken
- 👤 Gustaaf R. Mohlmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:51
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/13363; G02F1/133636; G02B; G02B5/00; G02B5/30; G02B5/3016; G02F1/133528; G02F1/137; G02F1/139; G02F1/1396; G02F1/1397; C; C09; C09K; C09K2323/00; C09K2323/03; C09K2323/031; G02F1/133637
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
43 words
A retardation layer for a liquid crystalline display comprising a twisted nematic or supertwisted nematic liquid crystalline polymer which is placed between glass substrates wherein at least one glass substrate has a thickness of 20-500 micrometers and is provided with an orientation layer.
Claim 2
Dependent Claim
43 words
A retardation layer for a liquid crystalline display comprising a twisted nematic or supertwisted nematic liquid crystalline polymer which is placed between glass substrates wherein at least one glass substrate has a thickness of 20-500 micrometers and is provided with an orientation layer.
Claim 3
Dependent Claim
21 words
A retardation layer according to claim 1 wherein at least one of the substrates has a thickness of 30 -100 micrometers.
Claim 4
Dependent Claim
35 words
A retardation layer according to either claim 1 or 2 wherein the liquid crystalline polymer is placed between a glass substrate with a thickness of 20-500 micrometers and a glass substrate of a display cell.
Claim 5
Dependent Claim
34 words
A retardation layer according to either claim 1 or 2 wherein the liquid crystalline polymer is placed between a glass substrate with a thickness of 20-500 micrometers and a polarizer of a display cell.
Claim 6
Dependent Claim
42 words
A retardation layer for a liquid crystalline display comprising a twisted nematic or supertwisted nematic liquid crystalline polymer structure comprising more than one pitch which is placed between glass substrates wherein at least one glass substrate has a thickness of 20-500 micrometers.
Claim 7
Dependent Claim
42 words
A retardation layer for a liquid crystalline display comprising a twisted nematic or supertwisted nematic liquid crystalline polymer structure comprising more than one pitch which is placed between glass substrates wherein at least one glass substrate has a thickness of 20-500 micrometers.
Claim 8
Dependent Claim
35 words
A polarizer comprising a uniform planar oriented liquid crystalline polymer and a dye, characterized in that the liquid crystalline polymer is placed between substrates wherein at least one substrate has a thickness of 20-500 micrometers.
Claim 9
Dependent Claim
35 words
A polarizer comprising a uniform planar oriented liquid crystalline polymer and a dye, characterized in that the liquid crystalline polymer is placed between substrates wherein at least one substrate has a thickness of 20-500 micrometers.
Claim 10
Dependent Claim
42 words
A retardation layer for a liquid crystalline display comprising a twisted nematic or supertwisted nematic liquid crystalline polymer structure comprising more than one pitch which is placed between glass substrates wherein at least one glass substrate has a thickness of 30-100 micrometers.
Claim 11
Dependent Claim
42 words
A retardation layer for a liquid crystalline display comprising a twisted nematic or supertwisted nematic liquid crystalline polymer structure comprising more than one pitch which is placed between glass substrates wherein at least one glass substrate has a thickness of 30-100 micrometers.
References Cited (Backward Citations)
EP0380338A2
Cited
EP0465107A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-11-19 | 2000-05-20 | 2000-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-11-19 | 2004-05-20 | 2004-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-11-19 | 2008-05-20 | 2008-11-19 | $7700.00 | Window Closed / Lapsed |