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US 7,119,868 B2Granted
Liquid crystal display device
AssigneeKabushiki Kaisha Toshiba
InventorToshiya Ootake
Life of this patent
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Abstract
A liquid crystal display device includes an electrode substrate, a liquid crystal layer with no twist, a first retardation plate, a second retardation plate, polarizing plates, and a color filter. The first and second retardation plates have slow axes that are parallel or perpendicular to the alignment direction of liquid crystal molecules. The product of the refractive anisotropy Δn of the liquid crystal layer and the thickness d of the liquid crystal layer, the retardation R1 of the first retardation plate and the retardation R2 of the second retardation plate satisfy at least one of the relational expressions: 530 nm≦Δnd+R1+R2≦570 nm, −20 nm≦Δnd−R1−R2≦20 nm, 255 nm≦Δnd−R1+R2≦295 nm, and 255 nm≦Δnd+R1−R2≦295 nm.
Claims4
A liquid crystal display device comprising:
- first and second electrode substrates;
- a liquid crystal layer held between the first and second electrode substrates and including liquid crystal molecules that are aligned substantially in parallel without twist;
- first and second retardation plates that are disposed on the first and second electrode substrates on sides opposed to the liquid crystal layer;
- first and second polarizing plates disposed on the first and second retardation plates;
- and
- a color filter disposed in one of the first and second electrode substrates;
- wherein the second electrode substrate includes a light transmissive section that passes backlight coming in from the second polarizing plate side, the first and second retardation plates have slow axes that are parallel or perpendicular to the alignment direction of the liquid crystal molecules, and a product of a refractive anisotropy Δn of the liquid crystal layer and a thickness d of the liquid crystal layer, a retardation R1 of the first retardation plate and a retardation R2 of the second retardation plate satisfy at least one of relational expressions:
- 530 nm≦Δnd+R1+R2≦570 nm,
- −20 nm≦Δnd−R1−R2≦20 nm,
- 255 nm≦Δnd−R1+R2≦295 nm, and
- 255 nm≦Δnd+R1−R2≦295 nm,
- wherein chromaticity coordinates (x, y) of transmitted light, when the backlight passes through the color filter layer, are within ranges of 0.290≦x≦0.310, and 0.280≦y≦0.300.
9 more elements
A liquid crystal display device comprising:
- first and second electrode substrates;
- a liquid crystal layer held between the first and second electrode substrates and including liquid crystal molecules that are aligned substantially in parallel without twist;
- a retardation plate that is disposed on the first electrode substrate on a side opposed to the liquid crystal layer;
- a polarizing plate disposed on the retardation plate;
- and
- a color filter disposed in the first electrode substrate;
- wherein the second electrode substrate includes a light reflective section that reflects ambient light coming in from the polarizing plate side, the retardation plate has a slow axis that is parallel or perpendicular to the alignment direction of the liquid crystal molecules, and a product of a refractive anisotropy Δn of the liquid crystal layer and a thickness d of the liquid crystal layer, a retardation R1 of the retardation plate satisfy at least one of relational expressions:
- 265 nm≦Δnd+R1≦285 nm,
- −10 nm≦Δnd−R1≦10 nm,
- wherein chromaticity coordinates (x, y) of transmitted light, when light from a standard D65 light source is twice passed as the ambient light through the color filter layer, are within ranges of 0.290≦x≦0.310, and 0.280≦y≦0.300.
7 more elements
A liquid crystal display device comprising:
- first and second electrode substrates;
- a liquid crystal layer held between the first and second electrode substrates and including liquid crystal molecules that are aligned substantially in parallel without twist;
- first and second retardation plates that are disposed on the first and second electrode substrates on sides opposed to the liquid crystal layer;
- first and second polarizing plates disposed on the first and second retardation plates;
- and
- a color filter disposed in the first electrode substrate;
- wherein the second electrode substrate includes a light transmissive section that passes backlight coming in from the second polarizing plate side, and a light reflective section that reflects ambient light coming in from the first polarizing plate side, the first and second retardation plates have slow axes that are parallel or perpendicular to the alignment direction of the liquid crystal molecules, and a product of a refractive anisotropy Δn of the liquid crystal layer and a thickness d1, d2 of the liquid crystal layer on the light transmissive section and the light reflective section, a retardation R1 of the first retardation plate and a retardation R2 of the second retardation plate satisfy at least one of relational expressions:
- 530 nm≦Δnd1+R1+R2≦570 nm,
- −20 nm≦Δnd1−R1−R2≦20 nm,
- 255 nm≦Δnd1−R1+R2≦295 nm, and
- 255 nm≦Δnd1−R1+R2≦295 nm, and
- satisfy at least one of relational expressions:
- 265 nm≦Δnd2−R1≦285 nm, and
- −10 nm≦Δnd2−R1≦10 nm,
- wherein chromaticity coordinates (x, y) of transmitted light, when the backlight passes through the color filter layer, and transmitted light, when light from a standard D65 light source is twice passed as the ambient light through the color filter layer, are within ranges of 0.290≦x≦0.310, and 0.280≦y≦0.300.
12 more elements
Dependencies are inferred from the claim text.