US5518783A
Expired / Lapsed
US
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Optical compensatory sheet and liquid crystal display
Assignee: Fujifilm Holdings Corp
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Filing: 1995-04-10
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Granted: 1996-05-21
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Expires: 2015-04-10
Abstract
Abstract Disclosed is an optical compensatory sheet comprising a transparent support and an optically anisotropic layer provided thereon and having an optic axis inclined at 20 to 34 degrees from the normal of the sheet, wherein the optically anisotropic layer is formed from a discotic compound capable of forming a discotic nematic phase and an organic compound which has compatibility with the discotic compound and is capable of lowering a transition temperature of the discotic nematic phase by at least 10° C. Further, a liquid crystal display provided with the optical compensatory sheet is disclosed.
Inventors
- 👤 Ken Kawata
- 👤 Masaki Okazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:39
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/13363; G02F1/133632; C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/32; G02B; G02B5/00; G02B5/30; G02B5/3016; C09K2019/328; C09K2323/00
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
79 words
An optical compensatory sheet comprising a transparent support and an optically anisotropic layer provided thereon and having an optic axis inclined at 20 to 34 degrees from the normal of the sheet, wherein the optically anisotropic layer is formed from a discotic compound capable of forming a discotic nematic phase and an organic compound which has compatibility with the discotic compound and is capable of lowering a transition temperature to the discotic nematic phase by at least 10° C.
Claim 2
Dependent Claim
79 words
An optical compensatory sheet comprising a transparent support and an optically anisotropic layer provided thereon and having an optic axis inclined at 20 to 34 degrees from the normal of the sheet, wherein the optically anisotropic layer is formed from a discotic compound capable of forming a discotic nematic phase and an organic compound which has compatibility with the discotic compound and is capable of lowering a transition temperature to the discotic nematic phase by at least 10° C.
Claim 3
Dependent Claim
24 words
The optical compensatory sheet as defined in claim 1, wherein an orientation layer is provided between the transparent support and the optically anisotropic layer.
Claim 4
Dependent Claim
23 words
The optical compensatory sheet as defined claim 2, wherein the orientation layer is a polymer layer which has been subjected to rubbing treatment.
Claim 5
Dependent Claim
23 words
The optical compensatory sheet as defined claim 2, wherein the orientation layer is prepared by obliquely depositing an inorganic compound on the support.
Claim 6
Dependent Claim
23 words
The optical compensatory sheet as defined in claim 1, wherein the optically anisotropic layer is in the condition of the discotic nematic phase.
Claim 7
Dependent Claim
24 words
The optical compensatory sheet as defined in claim 1, wherein the organic compound is a discotic compound capable of forming no discotic nematic phase.
Claim 8
Dependent Claim
38 words
The optical compensatory sheet as defined in claim 1, wherein the discotic compound capable of forming a discotic nematic phase has one structure selected from a benzene structure, a triphenylene structure, a truxene structure and a phthalocyanine structure.
Claim 9
Dependent Claim
35 words
The optical compensatory sheet as defined in claim 1, wherein the organic compound is a discotic compound having one structure selected from a benzene structure, a triphenylene structure, a truxene structure and a phthalocyanine structure.
Claim 10
Dependent Claim
24 words
The optical compensatory sheet as defined in claim 1, wherein the discotic compound capable of forming a discotic nematic phase has a triphenylene structure.
Claim 11
Dependent Claim
21 words
The optical compensatory sheet as defined in claim 1, wherein the organic compound is a discotic compound having a triphenylene structure.
Claim 12
Dependent Claim
96 words
The optical compensatory sheet as defined in claim 1, wherein the discotic compound capable of forming a discotic nematic phase has the formula (1): ##STR12## in which R 11 represents the group (1a): ##STR13## wherein R 12 represents an alkoxy group, Y 1 represents a halogen atom, an alkyl group of 1 to 3 carbon atoms or an alkoxy group of 1 to 3 carbon atoms, m1 represents 0 or 1 and n1 represents 0, 1 or 2, the number of the carbon atom of R 12 being not less than that of Y 1 .
Claim 13
Dependent Claim
93 words
The optical compensatory sheet as defined in claim 1, wherein the organic compound has the formula (2): ##STR14## in which R 21 represents the group (2a): ##STR15## wherein R 22 represents an alkyl group or an alkoxy group, Y 2 represents a halogen atom, an alkyl group of 1 to 7 carbon atoms or an alkoxy group of 1 to 7 carbon atoms, m2 represents 0 or 1 and n2 represents 0, 1 or 2, the number of the carbon atom of R 22 being not less than that of Y 2 .
Claim 14
Dependent Claim
36 words
The optical compensatory sheet as defined in claim 1, the ratio between the discotic compound capable of forming a discotic nematic phase and the organic compound is in the range of 50:50 to 99:1, by weight.
Claim 15
Dependent Claim
74 words
The optical compensatory sheet as defined claim 1, wherein the transparent support has a light transmittance of not less than 80%, shows optically isotropy on the plane of the film, and satisfies the condition of: 30≦[(nx+ny)/2-nz]×d≦150 in which nx and ny are main refractictive indices on the plane of the support, nz is a main refractive index in the thickness direction, and d is the thickness of the support, unit of d being nm.
Claim 16
Dependent Claim
133 words
A liquid crystal display comprising a liquid crystal cell which comprises a pair of substrates provided with a transparent electrode and twist-oriented nematic liquid crystal sealed therebetween, a pair of polarizing sheets arranged on both sides of the cell, and an optical compensatory sheet provided between the liquid crystal cell and the polarizing sheet; wherein the optical compensatory sheet comprises a transparent support and an optically anisotropic layer provided thereon and has an optic axis inclined at 20 to 34 degrees from the normal of the sheet, the optically anisotropic layer being formed from a discotic compound capable of forming a discotic nematic phase and an organic compound which has compatibility with the discotic compound and is capable of lowering a transition temperature to the discotic nematic phase by at least 10° C.
Claim 17
Dependent Claim
133 words
A liquid crystal display comprising a liquid crystal cell which comprises a pair of substrates provided with a transparent electrode and twist-oriented nematic liquid crystal sealed therebetween, a pair of polarizing sheets arranged on both sides of the cell, and an optical compensatory sheet provided between the liquid crystal cell and the polarizing sheet; wherein the optical compensatory sheet comprises a transparent support and an optically anisotropic layer provided thereon and has an optic axis inclined at 20 to 34 degrees from the normal of the sheet, the optically anisotropic layer being formed from a discotic compound capable of forming a discotic nematic phase and an organic compound which has compatibility with the discotic compound and is capable of lowering a transition temperature to the discotic nematic phase by at least 10° C.
Claim 18
Dependent Claim
24 words
The liquid crystal display as defined in claim 15, wherein an orientation layer is provided between the transparent support and the optically anisotropic layer.
Claim 19
Dependent Claim
24 words
The liquid crystal display sheet as defined in claim 15, wherein the optically anisotropic layer is in the condition of the discotic nematic phase.
Claim 20
Dependent Claim
24 words
The liquid crystal display as defined in claim 15, wherein the organic compound is a discotic compound capable of forming no discotic nematic phase.
Claim 21
Dependent Claim
24 words
The liquid crystal display as defined in claim 15, wherein the discotic compound capable of forming a discotic nematic phase has a triphenylene structure.
Claim 22
Dependent Claim
21 words
The liquid crystal display as defined in claim 15, wherein the organic compound is a discotic compound having a triphenylene structure.
References Cited (Backward Citations)
US5308535A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-05-21 | 1999-11-20 | 2000-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-05-21 | 2003-11-20 | 2004-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-05-21 | 2007-11-20 | 2008-05-21 | $7700.00 | Window Closed / Lapsed |