Liquid crystal display device
AssigneeJapan Display Inc.
InventorsTatsuya SUGITA, Masaya ADACHI
Life of this patent
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Abstract
The backlight has an anisotropic diffusion sheet disposed between the reflective polarizing plate and the optical path converter. The anisotropic diffusion sheet includes a refractive index anisotropic diffusion sheet stretched in an absorption axis direction in which a concave-convex portion is formed on a surface of the reflective polarized plate, and an isotropic material part laminated on a surface of the concave-convex part. The isotropic material part has an isotropic reflective index. The refractive index of the isotropic material part is the same as the refractive index in the transmission axis direction perpendicular to a stretching direction of the refractive index anisotropic sheet.
Claims8
A liquid crystal display device comprising:
- a reflective polarizing plate provided on a back side of a liquid crystal panel, to reflect linearly polarized light in an absorption axis direction of the polarizing plate towards a direction of a backlight, and transmit linearly polarized light in a transmission axis direction of the polarizing plate;
- and
- an optical path converter in which a prism row is formed to direct light output from a light guide plate towards the liquid crystal panel,
- wherein the backlight has an anisotropic diffusion sheet disposed between the reflective polarizing plate and the optical path converter,
- wherein the anisotropic diffusion sheet includes:
- a refractive index anisotropic sheet stretched in the abruption axis direction, in which a concave-convex portion is formed in a concave convex shape on a surface on the side of the reflective polarizing plate;
- and
- an isotropic material part laminated on a surface of the concave-convex portion, having an isotropic refractive index, and
- wherein the refractive index of the isotropic material part is the same as a refractive index in the transmission axis direction perpendicular to a stretching direction of the refractive index anisotropic sheet.
A liquid crystal display device comprising:
- a reflective polarizing plate provided on a back side of a liquid crystal panel, to reflect linearly polarized light in an absorption axis direction of the polarizing plate towards a direction of a backlight, and transmit linearly polarized light in a transmission axis direction of the polarizing plate;
- and
- an optical path converter in which a prism row is formed to direct light output from a light guide plate towards the liquid crystal panel,
- wherein the backlight has an anisotropic diffusion sheet disposed between the reflective polarizing plate and the optical path converter,
- wherein the anisotropic diffusion sheet has a diffraction grating formed in a concave convex shape on a surface of the anisotropic diffusion sheet, and
- wherein the anisotropic diffusion sheet is arranged so that a grooves of the diffraction grating are parallel to the absorption axis direction.
Dependencies are inferred from the claim text.