RETARDATION FILM, BRIGHTNESS ENHANCEMENT FILM, POLARIZING PLATE, PRODUCING METHOD OF A RETARDATION FILM, AND LIQUID CRYSTAL DISPLAY
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Accused Products
Abstract
A retardation film that is used as a polarizing plate protective film, thereby making it possible to yield a polarizing plate which is very good in durability and has a viewing angle compensation function. The retardation film has: an optical anisotropic film, in which a relation of nx>ny is realized between a refractive index “nx” in a slow axis direction of an in-plane direction and a refractive index “ny” in a fast axis direction of the in-plane direction; and a retardation layer formed on the optical anisotropic film and containing a liquid crystalline material, in which a relation of nx≦ny<nz is realized between refractive indexes “nx” and “ny” in arbitrary directions “x” and “y” of an in-plane direction which are perpendicular to each other and a refractive index “nz” in a thickness direction. The optical anisotropic film uses a transparent substrate having a cellulose derivative.
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Citations
53 Claims
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1-20. -20. (canceled)
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21. A retardation film, comprising:
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an optical anisotropic film, in which a relation of nx>
ny is realized between a refractive index “
nx”
in a slow axis direction of an in-plane direction and a refractive index “
ny”
in a fast axis direction of the in-plane direction; anda retardation layer formed on the optical anisotropic film and containing a liquid crystalline material, in which a relation of nx≦
ny<
nz is realized between refractive indexes “
nx” and
“
ny”
in arbitrary directions “
x” and
“
y”
of an in-plane direction which are perpendicular to each other and a refractive index “
nz”
in a thickness direction,wherein the optical anisotropic film uses a transparent substrate comprising a cellulose derivative. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 46, 47, 48, 49)
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30. A producing method of a retardation film, comprising steps of:
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an optical anisotropic film forming step of using a transparent substrate comprising a cellulose derivative, coating on the transparent substrate an optical-anisotropic-layer-forming coating solution in which an optical anisotropic material having a retardation exhibiting a wavelength dependency of a normal dispersion type is dissolved in a solvent, and thereby forming an optical anisotropic film in which an optical anisotropic layer is formed on the transparent substrate; a stretching step of stretching the optical anisotropic film formed in the optical anisotropic film forming step; and a retardation layer forming step of forming, on the optical anisotropic layer of the optical anisotropic film stretched in the stretching step, a retardation layer containing a liquid crystalline material, in which a relation of nx≦
ny<
nz is realized between refractive indexes “
nx” and
“
ny”
in arbitrary directions “
x” and
“
y”
of an in-plane direction which are perpendicular to each other and a refractive index “
nz”
in a thickness direction. - View Dependent Claims (34, 38, 42, 50)
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31. A producing method of a retardation film, comprising steps of:
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an optical anisotropic film forming step of using a transparent substrate comprising a cellulose derivative, coating on the transparent substrate an optical-anisotropic-layer-forming coating solution in which an optical anisotropic material having a retardation exhibiting a wavelength dependency of a normal dispersion type is dissolved in a solvent, and thereby forming an optical anisotropic film in which an optical anisotropic layer is formed on the transparent substrate; a retardation layer forming step of forming, on the optical anisotropic layer of the optical anisotropic film formed in the optical anisotropic film forming step, a retardation layer containing a liquid crystalline material, in which a relation of nx≦
ny<
nz is realized between refractive indexes “
nx” and
“
ny”
in arbitrary directions “
x” and
“
y”
of an in-plane direction which are perpendicular to each other and a refractive index “
nz”
in a thickness direction, thereby forming an optical laminate in which the retardation layer is formed on the optical anisotropic layer; anda stretching step of stretching the optical laminate formed in the retardation layer forming step. - View Dependent Claims (35, 39, 43, 51)
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32. A producing method of a retardation film, comprising steps of:
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an optical anisotropic film forming step of using a transparent substrate comprising a cellulose derivative, coating on the transparent substrate an optical-anisotropic-layer-forming coating solution in which an optical anisotropic material having a retardation exhibiting a wavelength dependency of a normal dispersion type is dissolved in a solvent, and thereby forming an optical anisotropic film in which an optical anisotropic layer is formed on the transparent substrate; a stretching step of stretching the optical anisotropic film formed in the optical anisotropic film forming step; and a retardation layer forming step of forming, on a surface opposite to the optical-anisotropic-layer-formed surface of the optical anisotropic film stretched in the stretching step, a retardation layer containing a liquid crystalline material, in which a relation of nx≦
ny<
nz is realized between refractive indexes “
nx” and
“
ny”
in arbitrary directions “
x” and
“
y”
of an in-plane direction which are perpendicular to each other and a refractive index “
nz”
in a thickness direction. - View Dependent Claims (36, 40, 44, 52)
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33. A producing method of a retardation film, comprising steps of:
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an optical anisotropic film forming step of using a transparent substrate comprising a cellulose derivative, coating on the transparent substrate an optical-anisotropic-layer-forming coating solution in which an optical anisotropic material having a retardation exhibiting a wavelength dependency of a normal dispersion type is dissolved in a solvent, and thereby forming an optical anisotropic film in which an optical anisotropic layer is formed on the transparent substrate; a retardation layer forming step of forming, on a surface opposite to the optical-anisotropic-layer-formed surface of the optical anisotropic film formed in the optical anisotropic film forming step, a retardation layer containing a liquid crystalline material, in which a relation of nx≦
ny<
nz is realized between refractive indexes “
nx” and
“
ny”
in arbitrary directions “
x” and
“
y”
of an in-plane direction which are perpendicular to each other and a refractive index “
nz”
in a thickness direction, and thereby forming an optical laminate in which the retardation layer is formed on the optical anisotropic layer; anda stretching step of stretching the optical laminate formed in the retardation layer forming step. - View Dependent Claims (37, 41, 45, 53)
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Specification