Optical Sheet Laminate, Backlight Unit, Liquid Crystal Display Device, Information Equipment, And Production Method For Backlight Unit
AssigneeKeiwa Inc.
InventorChengheng TSAI
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Abstract
An optical sheet laminate 100 to be incorporated into a backlight unit 40 includes a plurality of diffusion sheets 43 having a first surface 21a having a plurality of recesses 22 having a substantially inverted polygonal pyramid shape, and a pair of prism sheets 44 and 45 having prism extending directions perpendicular to each other. An arrangement direction of the recesses 22 of one of the plurality of diffusion sheets 43 closest to the prism sheets 44 and 45 intersects with the prism extending directions at an angle of 0° or more and 20° or less, or 70° or more and 90° or less.
Claims10
An optical sheet laminate to be incorporated into a backlight unit, comprising:
- a plurality of diffusion sheets each comprising surfaces, at least one of which has a plurality of recesses comprising a substantially inverted polygonal pyramid shape and arranged in a two-dimensional matrix;
- and
- a pair of prism sheets comprising prism extending directions perpendicular to each other,
- wherein a first arrangement direction of the plurality of recesses of a first diffusion sheet that is one of the plurality of diffusion sheets closest to the pair of prism sheets intersects with the prism extending directions at an angle of 0° or more and 20° or less, or 70° or more and 90° or less.
A method for manufacturing a backlight unit to be built in a liquid crystal display device and leading light emitted from light sources toward a display screen, the method comprising:
- arranging a plurality of diffusion sheets between the light sources and the display screen, where the diffusion sheets each comprise surfaces, at least one of which has a plurality of recesses comprising a substantially inverted polygonal pyramid shape and arranged in a two-dimensional matrix;
- and
- arranging a pair of prism sheets between the plurality of diffusion sheets and the display screen, where the pair of prism sheets comprise prism extending directions perpendicular to each other,
- wherein in arranging the plurality of diffusion sheets, luminance uniformity is evaluated with various intersecting angles between an arrangement direction of the plurality of recesses of each of the plurality of diffusion sheets and the prism extending directions;
- and based on an evaluation result, the arrangement direction of the plurality of recesses of each of the plurality of diffusion sheets is determined.
Dependencies are inferred from the claim text.