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US 2013/0077028 A1Published application
Liquid crystal display device
AssigneeJapan Display Inc.
InventorsKayoko MIYAZAKI, Keiji Tago
Life of this patent
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Abstract
According to one embodiment, a liquid crystal display device includes a first substrate, a second substrate, a liquid crystal layer, pixels a first polarizer having a first absorption axis, a second polarizer having a second absorption axis, a first retardation film having a first slow axis, and a second retardation film having a second slow axis. Each of the pixels includes a primary pixel electrode and a pair of primary common electrodes. Re1<Re2 holds, Re1+Re2=150±50 nm holds for light having a wavelength of 550 nm, and Rth1+Rth2=−10±50 nm holds for the light having the wavelength of 550 nm.
Claims13
A liquid crystal display device comprising:
- a first substrate;
- a second substrate arranged opposite to the first substrate with a gap;
- a liquid crystal layer held between the first substrate and the second substrate, a liquid crystal molecule in the liquid crystal layer being initially aligned in a direction substantially parallel to a Y-axis;
- a plurality of pixels provided in a two-dimensional matrix in a first direction and a second direction orthogonal to the first direction, a length in the first direction being less than a length in the second direction in each of the pixels;
- a first polarizer disposed in an outer surface of the first substrate and having a first absorption axis parallel to the Y-axis;
- a second polarizer disposed in an outer surface of the second substrate and having a second absorption axis parallel to an X-axis orthogonal to the Y-axis, the first polarizer and the second polarizer being disposed at a crossed nicols angle;
- a first retardation film disposed between the second substrate and the second polarizer and having a first slow axis parallel to the Y-axis;
- and
- a second retardation film disposed between the first retardation film and the second polarizer and having a second slow axis parallel to the Y-axis, wherein
- the X-axis is parallel to the first direction,
- the Y-axis is parallel to the second direction,
- each of the pixels comprises a primary pixel electrode that is provided on the first substrate and extends in the second direction, and a pair of primary common electrodes provided on the second substrate, the primary pixel electrode being interposed between the primary common electrodes in the first direction, the primary common electrodes extending in the second direction,
- assuming that nx1 is a refractive index in the X-axis, that ny1 is a refractive index in the Y-axis, that nz1 is a refractive index in a Z-axis orthogonal to the X-axis and the Y-axis, that d1 is a thickness, that Re1=(nx1−ny1)·d1 is a horizontal retardation defined by the X-axis and the Y-axis, and that Rth1=((nx1+ny1)/2−nz1)·d1 is a vertical retardation along the Z-axis in the first retardation film,
- assuming that nx2 is a refractive index in the X-axis, that ny2 is a refractive index in the Y-axis, that nz2 is a refractive index in the Z-axis, that d2 is a thickness, that Re2=(nx2−ny2)·d2 is a horizontal retardation value, and that Rth2=((nx2+ny2)/2−nz2)·d2 is a vertical retardation value in the second retardation film,
- Re1<Re2 holds,
- Re1+Re2=150±50 nm holds for light having a wavelength of 550 nm, and
- Rth1+Rth2=−10±50 nm holds for the light having the wavelength of 550 nm.
14 more elements
A liquid crystal display device comprising:
- a first substrate;
- a second substrate arranged opposite to the first substrate with a gap;
- a liquid crystal layer held between the first substrate and the second substrate, a liquid crystal molecule in the liquid crystal layer being initially aligned in a direction substantially parallel to a Y-axis;
- a plurality of pixels provided in a two-dimensional matrix in a first direction and a second direction orthogonal to the first direction, a length in the first direction being less than a length in the second direction in each of the pixels;
- a first polarizer disposed in an outer surface of the first substrate and having a first absorption axis parallel to the Y-axis;
- a second polarizer disposed in an outer surface of the second substrate and having a second absorption axis parallel to an X-axis orthogonal to the Y-axis, the first polarizer and the second polarizer being disposed at a crossed nicols angle;
- a first retardation film disposed between the first substrate and the first polarizer and having a first slow axis parallel to the Y-axis;
- and
- a second retardation film disposed between the first retardation film and the first polarizer and having a second slow axis parallel to the Y-axis, wherein
- the X-axis is parallel to the first direction,
- the Y-axis is parallel to the second direction,
- each of the pixels comprises a primary pixel electrode that is provided on the first substrate and extends in the second direction, and a pair of primary common electrodes provided on the second substrate, the primary pixel electrode being interposed between the primary common electrodes in the first direction, the primary common electrodes extending in the second direction,
- assuming that nx1 is a refractive index in the X-axis, that ny1 is a refractive index in the Y-axis, that nz1 is a refractive index in a Z-axis orthogonal to the X-axis and the Y-axis, that d1 is a thickness, that Re1=(nx1−ny1)·d1 is a horizontal retardation defined by the X-axis and the Y-axis, and that Rth1=((nx1+ny1)/2−nz1)·d1 is a vertical retardation along the Z-axis in the first retardation film,
- assuming that nx2 is a refractive index in the X-axis, that ny2 is a refractive index in the Y-axis, that nz2 is a refractive index in the Z-axis, that d2 is a thickness, that Re2=(nx2−ny2)·d2 is a horizontal retardation value, and that Rth2=((nx2+ny2)/2−nz2)·d2 is a vertical retardation value in the second retardation film,
- Re1<Re2 holds,
- Re1+Re2=150±50 nm holds for light having a wavelength of 550 nm, and
- Rth1+Rth2=−10±50 nm holds for the light having the wavelength of 550 nm.
14 more elements
A liquid crystal display device comprising:
- a first substrate;
- a second substrate arranged opposite to the first substrate with a gap;
- a liquid crystal layer held between the first substrate and the second substrate, a liquid crystal molecule in the liquid crystal layer being initially aligned in a direction substantially parallel to a Y-axis;
- a plurality of pixels provided in a two-dimensional matrix in a first direction and a second direction orthogonal to the first direction, a length in the first direction being less than a length in the second direction in each of the pixels;
- a first polarizer disposed in an outer surface of the first substrate and having a first absorption axis parallel to an X-axis orthogonal to the Y-axis;
- a second polarizer disposed in an outer surface of the second substrate and having a second absorption axis parallel to the Y-axis, the first polarizer and the second polarizer being disposed at a crossed nicols angle;
- a first retardation film disposed between the second substrate and the second polarizer and having a first slow axis parallel to the Y-axis;
- and
- a second retardation film disposed between the first retardation film and the second polarizer and having a second slow axis parallel to the Y-axis, wherein
- the X-axis is parallel to the second direction,
- the Y-axis is parallel to the first direction,
- each of the pixels comprises a primary pixel electrode that is provided on the first substrate and extends in the second direction, and a pair of primary common electrodes provided on the second substrate, the primary pixel electrode being interposed between the primary common electrodes in the first direction, the primary common electrodes extending in the second direction,
- assuming that nx1 is a refractive index in the X-axis, that ny1 is a refractive index in the Y-axis, that nz1 is a refractive index in a Z-axis orthogonal to the X-axis and the Y-axis, that d1 is a thickness, that Re1=(nx1−ny1)·d1 is a horizontal retardation defined by the X-axis and the Y-axis, and that Rth1=((nx1+ny1)/2−nz1)·d1 is a vertical retardation along the Z-axis in the first retardation film,
- assuming that nx2 is a refractive index in the X-axis, that ny2 is a refractive index in the Y-axis, that nz2 is a refractive index in the Z-axis, that d2 is a thickness, that Re2=(nx2−ny2)·d2 is a horizontal retardation value, and that Rth2=((nx2+ny2)/2−nz2)·d2 is a vertical retardation value in the second retardation film,
- Re1<Re2 holds,
- Re1+Re2=150±50 nm holds for light having a wavelength of 550 nm, and
- Rth1+Rth2=−10±50 nm holds for the light having the wavelength of 550 nm.
14 more elements
A liquid crystal display device comprising:
- a first substrate;
- a second substrate arranged opposite to the first substrate with a gap;
- a liquid crystal layer held between the first substrate and the second substrate, a liquid crystal molecule in the liquid crystal layer being initially aligned in a direction substantially parallel to a Y-axis;
- a plurality of pixels provided in a two-dimensional matrix in a first direction and a second direction orthogonal to the first direction, a length in the first direction being less than a length in the second direction in each of the pixels;
- a first polarizer disposed in an outer surface of the first substrate and having a first absorption axis parallel to an X-axis orthogonal to the Y-axis;
- a second polarizer disposed in an outer surface of the second substrate and having a second absorption axis parallel to the Y-axis, the first polarizer and the second polarizer being disposed at a crossed nicols angle;
- a first retardation film disposed between the first substrate and the first polarizer and having a first slow axis parallel to the Y-axis;
- and
- a second retardation film disposed between the first retardation film and the first polarizer and having a second slow axis parallel to the Y-axis, wherein
- the X-axis is parallel to the second direction,
- the Y-axis is parallel to the first direction,
- each of the pixels comprises a primary pixel electrode that is provided on the first substrate and extends in the second direction, and a pair of primary common electrodes provided on the second substrate, the primary pixel electrode being interposed between the primary common electrodes in the first direction, the primary common electrodes extending in the second direction,
- assuming that nx1 is a refractive index in the X-axis, that ny1 is a refractive index in the Y-axis, that nz1 is a refractive index in a Z-axis orthogonal to the X-axis and the Y-axis, that d1 is a thickness, that Re1=(nx1−ny1)·d1 is a horizontal retardation defined by the X-axis and the Y-axis, and that Rth1=((nx1+ny1)/2−nz1)·d1 is a vertical retardation along the Z-axis in the first retardation film,
- assuming that nx2 is a refractive index in the X-axis, that ny2 is a refractive index in the Y-axis, that nz2 is a refractive index in the Z-axis, that d2 is a thickness, that Re2=(nx2−ny2)·d2 is a horizontal retardation value, and that Rth2=((nx2+ny2)/2−nz2)·d2 is a vertical retardation value in the second retardation film,
- Re1<Re2 holds,
- Re1+Re2=150±50 nm holds for light having a wavelength of 550 nm, and
- Rth1+Rth2=−10±50 nm holds for the light having the wavelength of 550 nm.
14 more elements
Dependencies are inferred from the claim text.