Liquid crystal display device
First Claim
1. A liquid crystal display device comprising:
- a liquid crystal display panel comprising a first substrate having a plurality of reflection patterns protruding from a major surface of the first substrate, a second substrate disposed to be opposed to the first substrate, and a liquid crystal layer including liquid crystal molecules, which are twist-aligned at a twist angle of 70°
±
10°
, held between the first substrate and the second substrate; and
an optical element provided on an outer surface of the second substrate,wherein the optical element includes a polarizer plate, a first retardation plate which is disposed between the polarizer plate and the liquid crystal display panel and imparts a phase difference of a ½
wavelength between light rays of a predetermined wavelength, which pass through a fast axis and a slow axis of the first retardation plate, and a second retardation plate which is disposed between the first retardation plate and the liquid crystal display panel and imparts a phase difference of a ¼
A wavelength between light rays of a predetermined wavelength, which pass through a fast axis and a slow axis of the second retardation plate,a retardation value Δ
n·
d of the liquid crystal layer is set at 200 nm ±
30 nm, where Δ
n is a refractive index anisotropy of the liquid crystal layer and d is a thickness of the liquid crystal layer, andwherein a horizontal direction of the major surface of either of the first and second substrates is a reference azimuth, a counterclockwise direction relative to the reference azimuth is a positive direction and a clockwise direction relative to the reference azimuth is a negative direction, a director of the liquid crystal molecules is set within a range of 225°
±
20°
or a range of 315°
±
20°
relative to the reference azimuth.
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Accused Products
Abstract
A liquid crystal display device includes a liquid crystal display panel which is configured such that a liquid crystal layer including liquid crystal molecules, which are twist-aligned at a twist angle of 70°±10°, is held between a first substrate and a second substrate, and an optical element which is provided on an outer surface of the second substrate. The optical element includes a polarizer plate, a first retardation plate which imparts a phase difference of a ½ wavelength, and a second retardation plate which imparts a phase difference of a ¼ wavelength, and a retardation value Δn·d of the liquid crystal layer is set at 200 ±30 nm, where Δn is a refractive index anisotropy of the liquid crystal layer and d is a thickness of the liquid crystal layer.
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Citations
12 Claims
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1. A liquid crystal display device comprising:
-
a liquid crystal display panel comprising a first substrate having a plurality of reflection patterns protruding from a major surface of the first substrate, a second substrate disposed to be opposed to the first substrate, and a liquid crystal layer including liquid crystal molecules, which are twist-aligned at a twist angle of 70°
±
10°
, held between the first substrate and the second substrate; andan optical element provided on an outer surface of the second substrate, wherein the optical element includes a polarizer plate, a first retardation plate which is disposed between the polarizer plate and the liquid crystal display panel and imparts a phase difference of a ½
wavelength between light rays of a predetermined wavelength, which pass through a fast axis and a slow axis of the first retardation plate, and a second retardation plate which is disposed between the first retardation plate and the liquid crystal display panel and imparts a phase difference of a ¼
A wavelength between light rays of a predetermined wavelength, which pass through a fast axis and a slow axis of the second retardation plate,a retardation value Δ
n·
d of the liquid crystal layer is set at 200 nm ±
30 nm, where Δ
n is a refractive index anisotropy of the liquid crystal layer and d is a thickness of the liquid crystal layer, andwherein a horizontal direction of the major surface of either of the first and second substrates is a reference azimuth, a counterclockwise direction relative to the reference azimuth is a positive direction and a clockwise direction relative to the reference azimuth is a negative direction, a director of the liquid crystal molecules is set within a range of 225°
±
20°
or a range of 315°
±
20°
relative to the reference azimuth. - View Dependent Claims (2, 3, 4)
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5. A liquid crystal display device comprising:
-
a liquid crystal display panel comprising a first substrate having a plurality of reflection patterns protruding from a major surface of the first substrate, a second substrate disposed to be opposed to the first substrate, and a liquid crystal layer including liquid crystal molecules, which are twist-aligned at a twist angle of 70°
±
10°
, held between the first substrate and the second substrate; andan optical element provided on an outer surface of the second substrate, wherein the optical element includes a polarizer plate, a first retardation plate which is disposed between the polarizer plate and the liquid crystal display panel and imparts a phase difference of a ½
wavelength between light rays of a predetermined wavelength, which pass through a fast axis and a slow axis of the first retardation plate, and a second retardation plate which is disposed between the first retardation plate and the liquid crystal display panel and imparts a phase difference of a ¼
A wavelength between light rays of a predetermined wavelength, which pass through a fast axis and a slow axis of the second retardation plate,a retardation value Δ
n·
d of the liquid crystal layer is set at 200 nm ±
30 nm, where Δ
n is a refractive index anisotropy of the liquid crystal layer and d is a thickness of the liquid crystal layer, andwherein a horizontal direction of the major surface of either of the first and second substrates is a reference azimuth, a director of the liquid crystal molecules is set at 270°
relative to the reference azimuth, an absorption axis of the polarizer plate is set at 15°
±
0.5°
relative to the reference azimuth, and a slow axis of the second retardation plate is set at 90°
±
0.5°
relative to the reference azimuth. - View Dependent Claims (6, 7, 8)
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9. A liquid crystal display device comprising:
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a liquid crystal display panel comprising a first substrate having a plurality of reflection patterns protruding from a major surface of the first substrate, a second substrate disposed to be opposed to the first substrate, and a liquid crystal layer including liquid crystal molecules, which are twist-aligned at a twist angle of 70°
±
10°
, held between the first substrate and the second substrate; andan optical element provided on an outer surface of the second substrate, wherein the optical element includes a polarizer plate, a first retardation plate which is disposed between the polarizer plate and the liquid crystal display panel and imparts a phase difference of a ½
wavelength between light rays of a predetermined wavelength, which pass through a fast axis and a slow axis of the first retardation plate, and a second retardation plate which is disposed between the first retardation plate and the liquid crystal display panel and imparts a phase difference of a ¼
A wavelength between light rays of a predetermined wavelength, which pass through a fast axis and a slow axis of the second retardation plate,a retardation value Δ
n·
d of the liquid crystal layer is set at 200 nm 30 nm, where Δ
n is a refractive index an isotropy of the liquid crystal layer and d is a thickness of the liquid crystal layer, andwith respect to at least one of the first retardation plate and the second retardation plate, an Nz coefficient, which is defined by (nx−
nz)/(nx−
ny), is set in a range of less than 1, where nx and ny are refractive indices in mutually perpendicular directions in a plane of said at least one of the first retardation plate and the second retardation plate, and nz is a refractive index in a normal direction to the plane. - View Dependent Claims (10, 11, 12)
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Specification