Phase difference plate comprising polymer film containing compound having rod- shaped molecular structure
First Claim
1. A phase retarder comprising a single polymer film which contains a rod-like compound exhibiting a maximum absorption wavelength (λ
- max) of shorter than 250 nm in an ultraviolet absorption spectrum measured in a form of a solution of the compound, wherein the film has a retardation value of Re450 in the range of 60 to 135 nm measured at a wavelength of 450 nm, and a retardation value of Re590 in the range of 100 to 170 nm measured at a wavelength of 590 nm, said Re450 and Re590 satisfying a condition of Re590-Re450≧
2 nm.
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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 wave-length 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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Citations
20 Claims
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1. A phase retarder comprising a single polymer film which contains a rod-like compound exhibiting a maximum absorption wavelength (λ
- max) of shorter than 250 nm in an ultraviolet absorption spectrum measured in a form of a solution of the compound, wherein the film has a retardation value of Re450 in the range of 60 to 135 nm measured at a wavelength of 450 nm, and a retardation value of Re590 in the range of 100 to 170 nm measured at a wavelength of 590 nm, said Re450 and Re590 satisfying a condition of Re590-Re450≧
2 nm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- max) of shorter than 250 nm in an ultraviolet absorption spectrum measured in a form of a solution of the compound, wherein the film has a retardation value of Re450 in the range of 60 to 135 nm measured at a wavelength of 450 nm, and a retardation value of Re590 in the range of 100 to 170 nm measured at a wavelength of 590 nm, said Re450 and Re590 satisfying a condition of Re590-Re450≧
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11. A phase retarder comprising a single polymer film which contains a rod-like compound exhibiting a maximum absorption wavelength (λ
- max) of shorter than 250 nm in an ultraviolet absorption spectrum measured in a form of a solution of the compound, wherein the film has a retardation value of Re450 in the range of 120 to 270 nm measured at a wavelength of 450 nm, and a retardation value of Re590 in the range of 200 to 340 nm measured at a wavelength of 590 nm, said Re450 and Re590 satisfying a condition of Re590-Re450≧
2 nm.
- max) of shorter than 250 nm in an ultraviolet absorption spectrum measured in a form of a solution of the compound, wherein the film has a retardation value of Re450 in the range of 120 to 270 nm measured at a wavelength of 450 nm, and a retardation value of Re590 in the range of 200 to 340 nm measured at a wavelength of 590 nm, said Re450 and Re590 satisfying a condition of Re590-Re450≧
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12. A circularly polarizing plate comprising a phase retarder and a polarizing membrane, said polarizing membrane having a polarizing axis essentially at an angle of 45°
- to a slow axis in a plane of the phase retarder, and said phase retarder comprising a single polymer film which contains a rod-like compound exhibiting a maximum absorption wavelength (λ
max) of shorter than 250 nm in an ultraviolet absorption spectrum measured in a form of a solution of the compound, wherein the film has a retardation value of Re450 in the range of 60 to 135 nm measured at a wavelength of 450 nm, and a retardation value of Re590 in the range of 100 to 170 nm measured at a wavelength of 590 nm, said Re450 and Re590 satisfying a condition of Re590-Re450≧
2 nm. - View Dependent Claims (13)
- to a slow axis in a plane of the phase retarder, and said phase retarder comprising a single polymer film which contains a rod-like compound exhibiting a maximum absorption wavelength (λ
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14. A touch panel comprising two transparent electrically conductive substrates each of which has a transparent electrically conductive membrane on one surface, said two substrates being so arranged that the surfaces on which the membrane is provided face to each other, wherein at least one of the substrates is a λ
- /4 plate or is laminated on a λ
/4 plate, said λ
/4 plate comprising a single polymer film which contains a rod-like compound exhibiting a maximum absorption wavelength (λ
max) of shorter than 250 nm in an ultraviolet absorption spectrum measured in a form of a solution of the compound, wherein the film has a retardation value of Re450 in the range of 60 to 135 nm measured at a wavelength of 450 nm, and a retardation value of Re590 in the range of 100 to 170 nm measured at a wavelength of 590 nm, said Re450 and Re590 satisfying a condition of Re590-Re450≧
2 nm. - View Dependent Claims (15, 16, 17, 18)
- /4 plate or is laminated on a λ
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19. A cellulose ester film containing a compound represented by the following formula (II):
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Ar1—
L2—
X—
L3—
Ar2
(II)[in which each of Ar1 and Ar2 is independently an aromatic group;
each of L2 and L3 is independently a divalent linking group selected from the group consisting of an alkylene group, —
O—
, —
CO— and
combinations thereof; and
X is 1,4-cyclohexylene, vinylene or ethynylene].- View Dependent Claims (20)
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Specification