US5337174A
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Optical compensator and liquid crystal display
Assignee: Seiko Epson Corp
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Filing: 1992-06-15
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Granted: 1994-08-09
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Expires: 2012-06-15
Abstract
Abstract PCT No. PCT/JP92/00762 Sec. 371 Date Apr. 14, 1993 Sec. 102(e) Date Apr. 14, 1993 PCT Filed Jun. 15, 1992 PCT Pub. No. WO92/22836 PCT Pub. Date Dec. 23, 1992.There is provided a laminate consisting of a first oriented film (1) obtainable by drawing, at least in one direction, a polymer film having a refractive index of nD>/=1.60, an Abbe number of nu D>/=30.0 and a glass transition temperature of Tg=60 DEG to 160 DEG C. and a second oriented film (2) obtainable by drawing, at least in one direction, a polymer film having a refractive index of nD<1.60. The laminate has a retardation value R of 60-1000 nm and a wavelength dispersion value nu RF of not less than 1.10. This oriented film either as it is or as laminated with an optically isotropic film at least on one side is used to fabricate an optical compensator for color compensation in a liquid crystal panel. In this manner, there can be obtained a liquid crystal display panel which solves the long-standing problems of coloration and low contrast ratio.
Inventors
- 👤 Hiroshi Wada
- 👤 Shinji Wada
- 👤 Osamu Okumura
- 👤 Rinjiro Ichikawa
- 👤 Kenji Hashimoto
- 👤 Takashi Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:36
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/30; G02B5/3083; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/13363; G02F1/133637; G02F2202/00; G02F2202/40; G02F2413/00; G02F2413/02; G02F2413/08
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
130 words
An optical compensator comprising a laminate, wherein the laminate comprises: (1) at least one oriented film of a first type obtained by stretching, in at least one axis, a polymer film having a refractive index n D ≧1.60, an Abbe number ν D ≦30.0 and a glass transition temperature Tg=60° to 160° C., and (2) at least one oriented film of a second type laminated to said oriented film of the first type, said oriented film of the second type being obtained by stretching, in at least one axis, a polymer film having a refractive index n D <1.60, wherein the oriented film of the first type has at least one axis of orientation which is parallel to an axis of orientation of the oriented film of the second type.
Claim 2
Dependent Claim
130 words
An optical compensator comprising a laminate, wherein the laminate comprises: (1) at least one oriented film of a first type obtained by stretching, in at least one axis, a polymer film having a refractive index n D ≧1.60, an Abbe number ν D ≦30.0 and a glass transition temperature Tg=60° to 160° C., and (2) at least one oriented film of a second type laminated to said oriented film of the first type, said oriented film of the second type being obtained by stretching, in at least one axis, a polymer film having a refractive index n D <1.60, wherein the oriented film of the first type has at least one axis of orientation which is parallel to an axis of orientation of the oriented film of the second type.
Claim 3
Dependent Claim
75 words
The optical compensator of claim 1, wherein the laminate film has a retardation value R=60 to 1000 nm, and the oriented film of the first type has a wavelength dispersion value ν RF of not less than 1.10, wherein ν RF is defined by the following equation: ##EQU1## wherein Δn is the refractive index of the oriented film of the first type and d is the thickness of the oriented film of the first type.
Claim 4
Dependent Claim
35 words
The optical compensator of claim 1, wherein the laminate has a structure represented by (1)/(2), wherein (1) is an oriented film of the first type and (2) is an oriented film of the second type.
Claim 5
Dependent Claim
35 words
The optical compensator of claim 1, wherein the laminate has a structure represented by (1)/(2)/(1), wherein (1) is an oriented film of the first type and (2) is an oriented film of the second type.
Claim 6
Dependent Claim
35 words
The optical compensator of claim 1, wherein the laminate has a structure represented by (1)/(1)/(2), wherein (1) is an oriented film of the first type and (2) is an oriented film of the second type.
Claim 7
Dependent Claim
35 words
The optical compensator of claim 1, wherein the laminate has a structure represented by (2)/(1)/(2), wherein (1) is an oriented film of the first type and (2) is an oriented film of the second type.
Claim 8
Dependent Claim
35 words
The optical compensator of claim 1, wherein the laminate has a structure represented by (2)/(1)/(2)/(2), wherein (1) is an oriented film of the first type and (2) is an oriented film of the second type.
Claim 9
Dependent Claim
44 words
The optical compensator of claim 1, wherein the laminate has a structure represented by (1a)/(2a)/(1b), wherein (1a) is an oriented film of the first type, (1b) is an oriented film of the first type, and (2a) is an oriented film of the second type.
Claim 10
Dependent Claim
53 words
The optical compensator of claim 1, wherein the laminate has a structure represented by (1a)/(2a)/(1b)/(2b), wherein (1a) is an oriented film of the first type, (1b) is an oriented film of the first type, (2a) is an oriented film of the second type, and (2b) is an oriented film of the second type.
Claim 11
Dependent Claim
53 words
The optical compensator of claim 1, wherein the laminate has a structure represented by (1a)/(1b)/(2a)/(2b), wherein (1a) is an oriented film of the first type, (1b) is an oriented film of the first type, (2a) is an oriented film of the second type, and (2b) is an oriented film of the second type.
Claim 12
Dependent Claim
173 words
A liquid crystal display comprising: (a) a liquid crystal cell, (b) a pair of polarizers disposed on respective sides of said liquid crystal cell; and (c) at least one optical compensator interposed between said liquid crystal cell and one polarizer of said pair of polarizers, said optical compensator comprising a laminate which comprises: (1) at least one oriented film of a first type obtained by stretching, in at least one axis, a polymer film having a refractive index n D ≧1.60, an Abbe number ν D ≦30.0 and a glass transition temperature Tg=60° to 160° C., and (2) at least one oriented film of a second type laminated to said oriented film of the first type, said oriented film of the second type being obtained by stretching, in at least one axis, a polymer film having a refractive index n D <1.60, wherein the oriented film of the first type has at least one axis of orientation which is parallel to an axis of orientation of the oriented film of the second type.
Claim 13
Dependent Claim
173 words
A liquid crystal display comprising: (a) a liquid crystal cell, (b) a pair of polarizers disposed on respective sides of said liquid crystal cell; and (c) at least one optical compensator interposed between said liquid crystal cell and one polarizer of said pair of polarizers, said optical compensator comprising a laminate which comprises: (1) at least one oriented film of a first type obtained by stretching, in at least one axis, a polymer film having a refractive index n D ≧1.60, an Abbe number ν D ≦30.0 and a glass transition temperature Tg=60° to 160° C., and (2) at least one oriented film of a second type laminated to said oriented film of the first type, said oriented film of the second type being obtained by stretching, in at least one axis, a polymer film having a refractive index n D <1.60, wherein the oriented film of the first type has at least one axis of orientation which is parallel to an axis of orientation of the oriented film of the second type.
Claim 14
Dependent Claim
76 words
The liquid crystal display of claim 11, wherein the laminate film has a retardation value R=60 to 1000 nm, and the oriented film of the first type has a wavelength dispersion value ν RF of not less than 1.10, wherein ν RF is defined by the following equation: ##EQU2## wherein Δn is the refractive index of the oriented film of the first type and d is the thickness of the oriented film of the first type.
Claim 15
Dependent Claim
36 words
The liquid crystal display of claim 12, wherein the laminate has a structure represented by (1)/(2), wherein (1) is an oriented film of the first type and (2) is an oriented film of the second type.
Claim 16
Dependent Claim
36 words
The liquid crystal display of claim 12, wherein the laminate has a structure represented by (1)/(2)/(1), wherein (1) is an oriented film of the first type and (2) is an oriented film of the second type.
Claim 17
Dependent Claim
36 words
The liquid crystal display of claim 12, wherein the laminate has a structure represented by (1)/(1)/(2), wherein (1) is an oriented film of the first type and (2) is an oriented film of the second type.
Claim 18
Dependent Claim
36 words
The liquid crystal display of claim 12, wherein the laminate has a structure represented by (2)/(1)/(2), wherein (1) is an oriented film of the first type and (2) is an oriented film of the second type.
Claim 19
Dependent Claim
36 words
The liquid crystal display of claim 12, wherein the laminate has a structure represented by (2)/(1)/(2)/(2), wherein (1) is an oriented film of the first type and (2) is an oriented film of the second type.
Claim 20
Dependent Claim
45 words
The liquid crystal display of claim 12, wherein the laminate has a structure represented by (1a)/(2a)/(1b), wherein (1a) is an oriented film of the first type, (1b) is an oriented film of the first type, and (2a) is an oriented film of the second type.
Claim 21
Dependent Claim
54 words
The liquid crystal display of claim 12, wherein the laminate has a structure represented by (1a)/(2a)/(1b)/(2b), wherein (1a) is an oriented film of the first type, (1b) is an oriented film of the first type, (2a) is an oriented film of the second type, and (2b) is an oriented film of the second type.
Claim 22
Dependent Claim
54 words
The liquid crystal display of claim 12, wherein the laminate has a structure represented by (1a)/(1b)/(2a)/(2b), wherein (1a) is an oriented film of the first type, (1b) is an oriented film of the first type, (2a) is an oriented film of the second type, and (2b) is an oriented film of the second type.
References Cited (Backward Citations)
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