Liquid crystal display device
View Patent ↗A liquid crystal display device includes: a liquid crystal layer which contains a liquid crystal composition; a pair of substrates opposed to each other across the liquid crystal layer; alignment layers placed on liquid crystal layer sides of the pair of substrates, respectively; and polarization plates placed on opposite sides from the liquid crystal layer sides, respectively. The pair of substrates includes a thin-film transistor substrate including a thin-film transistor for controlling molecule alignment of the liquid crystal composition, and a color filter substrate including a color layer containing pixels of different colors. A blue pixel, which is one of the pixels of different colors, is larger in area than any of the pixels of other colors. A loss of light in a short-wavelength range is thus reduced.
1. A liquid crystal display device, comprising:
a liquid crystal layer which contains a liquid crystal composition;
a pair of substrates opposed to each other across the liquid crystal layer;
alignment layers placed on liquid crystal layer sides of the pair of substrates, respectively;
polarization plates placed on opposite sides from the liquid crystal layer sides of the pair of substrates, respectively; and
a uniaxis absorption anisotropy layer which exhibits dichroism in a wavelength range equal to or lower than 500 nm disposed at a position between at least one of the pair of substrates and the liquid crystal layer,
wherein the pair of substrates comprises:
a thin-film transistor substrate comprising a thin-film transistor for controlling molecule alignment of the liquid crystal composition; and
a color filter substrate comprising a color layer containing pixels of different colors,
wherein one of the pixels of different colors is a blue pixel for displaying blue, and
wherein the blue pixel is larger in area than any of the pixels of other colors.
2. The liquid crystal display device according to claim 1 , wherein a colorant of the blue pixel is an organic solvent-soluble dye.
3. The liquid crystal display device according to claim 1 , wherein at least one of the alignment layers is formed from a polyamic acid varnish composed of a diamine that is prepared by mixing 4,4′-diaminoazobenzene and 4,4′-diaminobenzophenone and an acid anhydride that is prepared by mixing pyromellitic dianhydride and 1,2,3,4-cyclobutanetetracarboxylic acid dianhydride.
4. The liquid crystal display device according to claim 1 , wherein at least one of the alignment layers functions as the uniaxis absorption anisotropy layer.
5. The liquid crystal display device according to claim 4 , wherein a colorant of the blue pixel is an organic solvent-soluble dye.
6. The liquid crystal display device according to claim 4 , wherein at least one of the alignment layers is formed from a polyamic acid varnish composed of a diamine that is prepared by mixing 4,4′-diaminoazobenzene and 4,4′-diaminobenzophenone and an acid anhydride that is prepared by mixing pyromellitic dianhydride and 1,2,3,4-cyclobutanetetracarboxylic acid dianhydride.
7. The liquid crystal display device according to claim 4 , further comprising a light source unit for illuminating the thin-film transistor substrate and the color filter substrate,
wherein, in the light source unit, a color temperature of a surface luminance is 13,000 K or lower.
8. The liquid crystal display device according to claim 4 , wherein the liquid crystal composition contained in the liquid crystal layer has a refractive index anisotropy of 0.07 to 0.085.
9. The liquid crystal display device according to claim 4 ,
wherein the pixels of different colors comprise a green pixel for displaying green and a red pixel for displaying red, and
wherein the green pixel is larger in area than the red pixel.
10. The liquid crystal display device according to claim 1 , wherein the uniaxis absorption anisotropy layer is formed in at least either one of the color layer of the color filter substrate or an overcoat layer provided to protect the color layer, and contains an organic compound that has a linear rodlike molecular structure being high in uniaxis anisotropy.
11. The liquid crystal display device according to claim 1 , further comprising a light source unit for illuminating the thin-film transistor substrate and the color filter substrate,
wherein, in the light source unit, a color temperature of a surface luminance is 13,000 K or lower.
12. The liquid crystal display device according to claim 1 , wherein the liquid crystal composition contained in the liquid crystal layer has a refractive index anisotropy of 0.07 to 0.085.
13. The liquid crystal display device according to claim 1 ,
wherein the pixels of different colors comprise a green pixel for displaying green and a red pixel for displaying red, and
wherein the green pixel is larger in area than the red pixel.
14. A liquid crystal display device, comprising:
a liquid crystal layer which contains a liquid crystal composition;
a pair of substrates opposed to each other across the liquid crystal layer;
alignment layers placed on liquid crystal layer sides of the pair of substrates, respectively; and
polarization plates placed on opposite sides from the liquid crystal layer sides of the pair of substrates, respectively,
wherein at least one of the polarization plates comprises a composite polarization layer comprising a positive uniaxial polarization layer made from a dichroic dye having positive uniaxial and a negative uniaxial polarization layer made from a dichroic dye having negative uniaxial,
wherein the pair of substrates comprises:
a thin-film transistor substrate comprising a thin-film transistor for controlling molecule alignment of the liquid crystal composition; and
a color filter substrate comprising a color layer containing pixels of different colors,
wherein one of the pixels of different colors is a blue pixel for displaying blue, and
wherein the blue pixel is larger in area than any of the pixels of other colors.
15. The liquid crystal display device according to claim 14 , further comprising a light source unit for illuminating the thin-film transistor substrate and the color filter substrate,
wherein, in the light source unit, a color temperature of a surface luminance is 13,000 K or lower.
16. The liquid crystal display device according to claim 14 , wherein the negative uniaxial polarization layer comprises a polarization layer formed by applying a material that has a chromonic liquid crystal phase.
17. The liquid crystal display device according to claim 14 , wherein the liquid crystal composition contained in the liquid crystal layer has a refractive index anisotropy of 0.07 to 0.085.
18. The liquid crystal display device according to claim 14 ,
wherein the pixels of different colors comprise a green pixel for displaying green and a red pixel for displaying red, and
wherein the green pixel is larger in area than the red pixel.
19. The liquid crystal display device according to claim 14 , wherein a colorant of the blue pixel is an organic solvent-soluble dye.
20. The liquid crystal display device according to claim 14 , wherein at least one of the alignment layers has a uniaxis absorption anisotropy.