US5380459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display device with improved viewing angle dependence of color
Assignee: Ricoh Co Ltd
•
Filing: 1991-04-19
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Granted: 1995-01-10
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Expires: 2011-04-19
Abstract
Abstract The present invention discloses a liquid crystal display device with improved viewing angle dependency upon contrast and color, comprising a liquid crystal cell having a pair of substrates each equipped with transparent electrodes and a liquid crystal layer positioned therebetween, polarizers disposed on opposite sides of the cell and a compensation plate disposed between at least one of the polarizers and the cell, in which at least one layer of the compensation plate is an aligned film comprising a liquid crystalline polymer or a polymer having a specific molecular structure, and a refractive index in a direction perpendicular to a plane of the film is larger than the minimum refractive index in a direction parallel to the plane.
Inventors
- 👤 Akihiko Kanemoto
- 👤 Haruo Iimura
- 👤 Yasuyuki Takiguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:12
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/38; C09K19/3833; C09K19/3842; C09K19/3852; C09K19/40; C09K19/406; C09K19/408; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/13363; G02F1/133634; G02F2202/00; G02F2202/40; G02F2413/00; G02F2413/02; G02F2413/08; G02F2413/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
86 words
A liquid crystal display device comprising a liquid crystal cell comprising (a) a pair of substrates each provided with transparent electrodes and (b) a liquid crystal layer positioned between the substrates; polarizers disposed on opposite sides of the cell; and a compensation plate disposed between at least one of the polarizers and the cell, wherein at least one layer of said compensation plate is an aligned film consisting essentially of a polysiloxane type liquid crystalline polymer having a repeating unit represented by the formula (XIX) ##STR14##
Claim 2
Dependent Claim
86 words
A liquid crystal display device comprising a liquid crystal cell comprising (a) a pair of substrates each provided with transparent electrodes and (b) a liquid crystal layer positioned between the substrates; polarizers disposed on opposite sides of the cell; and a compensation plate disposed between at least one of the polarizers and the cell, wherein at least one layer of said compensation plate is an aligned film consisting essentially of a polysiloxane type liquid crystalline polymer having a repeating unit represented by the formula (XIX) ##STR14##
Claim 3
Dependent Claim
47 words
The liquid crystal display device according to claim 1, wherein said at least one layer of said compensation plate comprises a polymer film prepared by aligning a group showing liquid crystalline property of a liquid crystalline polymer in a direction perpendicular to a plane of the layer.
Claim 4
Dependent Claim
84 words
The liquid crystal display device according to claim 2, wherein said compensation plate comprises at least a liquid crystalline polymer film prepared by aligning a group showing liquid crystalline property of a liquid crystalline polymer in a direction perpendicular to a plane of the plate and an aligned film prepared by monoaxially stretching an optional stretchable polymer film, in which the refractive index in a direction perpendicular to the plane is between the maximum refractive index and the minimum refractive index within the plane.
Claim 5
Dependent Claim
51 words
The liquid crystal display device according to claim 3, wherein said liquid crystalline polymer film is monoaxially stretched along to a plans of the film so that a refractive index in a direction perpendicular to the plane is between the maximum refractive index and the minimum refractive index within the plane.
Claim 6
Dependent Claim
64 words
The liquid crystal display device according to claim 1, wherein said compensation plate is comprised a solid phase polymer film obtained by heating a liquid crystalline polymer film to a liquid crystal phase forming temperature, aligning a group exhibiting liquid crystalline property of the liquid crystalline polymer substantially perpendicular to the plane of the film by an external power field and quenching the same.
Claim 7
Dependent Claim
18 words
The liquid crystal display device according to claim 5, wherein said external power field is an electric field.
Claim 8
Dependent Claim
18 words
The liquid crystal display device according to claim 5, wherein said external power field is an magnetic field.
Claim 9
Dependent Claim
61 words
The liquid crystal display device according to claim 1, wherein said compensation plate is comprised a solid phase polymer film obtained by heating a liquid crystalline polymer film to a liquid crystal phase forming temperature, aligning a group exhibiting liquid crystalline property of the liquid crystalline polymer substantially perpendicular to the plane of the film by using a homeotropically aligning agent.
Claim 10
Dependent Claim
26 words
The liquid crystal display device according to claim 1, wherein a liquid crystal transition temperature of said liquid crystalline polymer is not lower than 60° C.
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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) | 1998-01-09 | 1998-07-11 | 1999-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-09 | 2002-07-11 | 2003-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-09 | 2006-07-11 | 2007-01-10 | $7700.00 | Window Closed / Lapsed |