Phase difference plate comprising polymer film containing compound having rod-shaped molecular structure
First Claim
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1. A cellulose ester film comprising a compound which exhibits a maximum absorption wavelength (λ
- max) of shorter than 250 nm in an ultraviolet absorption spectrum measured in a solution of the compound, wherein the compound is represented by the following formula (II);
Ar1—
L2—
X—
L3—
Ar2
(II)in which each of Ar1 and Ar2 is independently a phenyl substituted in one position with an alkyl group;
each of L2 and L3 is independently —
OCO—
or —
COO—
; and
X is 1,4-cyclohexylene.
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Abstract
A phase difference plate which comprises one sheet of polymer film containing a compound having a rod-shaped molecular structure and exhibiting a maximum absorption wavelength (λmax) of less than 250 nm in an ultraviolet spectrum of its solution and which exhibits a retardation value as measured at a wavelength of 450 nm (Re450) of 60 to 135 nm and a retardation value as measured at a wavelength of 590 nm (Re590) of 100 to 170 nm, where the relationship: Re590−Re450≧2 nm is satisfied. The phase difference plate functions as a λ/4 plate.
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7 Claims
-
1. A cellulose ester film comprising a compound which exhibits a maximum absorption wavelength (λ
- max) of shorter than 250 nm in an ultraviolet absorption spectrum measured in a solution of the compound, wherein the compound is represented by the following formula (II);
Ar1—
L2—
X—
L3—
Ar2
(II)in which each of Ar1 and Ar2 is independently a phenyl substituted in one position with an alkyl group;
each of L2 and L3 is independently —
OCO—
or —
COO—
; and
X is 1,4-cyclohexylene.- View Dependent Claims (2, 3, 4, 5, 6, 7)
- max) of shorter than 250 nm in an ultraviolet absorption spectrum measured in a solution of the compound, wherein the compound is represented by the following formula (II);
Specification