Elliptically polarizing plate and liquid crystal display in which a compensation sheet direction of non-zero minimum retardation is inclined at 5 to 50 degrees
First Claim
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1. An elliptically polarizing plate comprising a polarizing film and an optical compensatory sheet provided thereon, wherein said sheet has a direction of a minimum retardation in the range of 2 to 20 nm which is inclined at 5 to 50 degrees from the normal of the sheet.
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Abstract
Disclosed is an elliptically polarizing plate comprising a polarizing film and an optical compensatory sheet provided, in which the compensatory sheet has a direction of a minimum retardation inclined at 5 to 50 degrees from the normal of the sheet. A process for preparation of the elliptically polarizing plate, and a liquid crystal display provided with the elliptically polarizing plate are also disclosed.
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Citations
19 Claims
- 1. An elliptically polarizing plate comprising a polarizing film and an optical compensatory sheet provided thereon, wherein said sheet has a direction of a minimum retardation in the range of 2 to 20 nm which is inclined at 5 to 50 degrees from the normal of the sheet.
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13. An elliptically polarizing plate comprising a polarizing film and an optical compensatory sheet provided thereon, wherein said sheet has a direction of a minimum retardation inclined at 5 to 50 degrees from the normal of the sheet and comprises a transparent film and an oriented layer of a discotic liquid crystal provided thereon, said transparent film having a light transmittance of not less than 80%, showing optically isotropy on the plane of the film, and satisfying the condition of:
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space="preserve" listing-type="equation">30{(nx+ny)/2-nz}×
d 23 150in which nx and ny are main refractive indices on the plane of the support, nz is a main refractive index in the thickness direction, and d is the thickness of the film, unit of d being nm. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification