Light diffusion sheet, back-light unit, liquid crystal display device, information apparatus, and method for manufacturing back-light unit
AssigneeKeiwa Inc.
InventorChengheng Tsai
Life of this patent
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Abstract
A light diffusion sheet is incorporated in a backlight unit using a plurality of light sources arranged in a two-dimensional matrix. The light diffusion sheet has surfaces, on at least one of which a plurality of recesses having a substantially inverted quadrangular pyramid shape are arranged in a two-dimensional matrix. An intersecting angle between an arrangement direction of the plurality of recesses and an arrangement direction of the plurality of light sources is 30° or more and 60° or less.
Claims11
A light diffusion sheet capable of being incorporated into a backlight unit using a plurality of light sources arranged in a two-dimensional matrix, the light diffusion sheet comprising:
- surfaces on at least one of which a plurality of recesses having a substantially inverted quadrangular pyramid shape are arranged in a two-dimensional matrix,
- wherein an intersecting angle between an arrangement direction of the plurality of recesses and an arrangement direction of the plurality of light sources is 30° or more and 60° or less;
- wherein the light diffusion sheet has a luminance uniformity of 150 or more, the luminance uniformity determined based on an average value of luminance divided by a standard deviation of luminance.
A method for manufacturing a backlight unit incorporated in a liquid crystal display device and leading light emitted from a plurality of light sources arranged in a two-dimensional matrix to a display screen, comprising:
- arranging the plurality of light sources;
- and
- arranging a light diffusion sheet having surfaces, on at least one of which a plurality of recesses having a substantially inverted quadrangular pyramid shape are arranged in a two-dimensional matrix,
- wherein the plurality of light sources and the light diffusion sheet are arranged so that an intersecting angle between an arrangement direction of the plurality of recesses and an arrangement direction of the plurality of light sources is 30° or more and 60° or less,
- wherein the light diffusion sheet has a luminance uniformity of 150 or more, the luminance uniformity determined based on an average value of luminance divided by a standard deviation of luminance.
Dependencies are inferred from the claim text.