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Prism sheet and backlight unit using same

A prism sheet, prism technology, applied in prisms, optical components, optics, etc., can solve the problem of reducing frontal brightness, and achieve the effect of improving frontal brightness, reducing light-gathering characteristics, and reducing the number of

Active Publication Date: 2015-11-18
KEIWA INCORPORATED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, if a diffusion sheet is provided on the surface side of the prism sheet as in the above-mentioned publication, not only the front luminance improved by the prism sheet is reduced, but also the requirement of thinning the backlight unit for liquid crystal display devices is contrary to the requirement of increasing the number of optical sheets.

Method used

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  • Prism sheet and backlight unit using same
  • Prism sheet and backlight unit using same

Examples

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Embodiment Construction

[0040] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. figure 1 The prism sheet 1 has in order from the back side to the front side: a transparent base material layer 2, a microparticle coating layer 3 in which microparticles 7 are dispersed in an adhesive 6, and a sheet-like portion where the surface of the microparticle coating layer 3 is laminated. 4 and a plurality of strip-shaped protruding prism parts 5 .

[0041] Since it is necessary to transmit light, the base material layer 2 may be formed of a transparent, especially colorless and transparent synthetic resin. The synthetic resin used for the base material layer 2 is not particularly limited, and examples thereof include polyethylene terephthalate, polyethylene naphthalate, acrylic resin, polycarbonate, polystyrene, polyolefin, Cellulose acetate, weather-resistant vinyl chloride, active energy ray-curable resin, etc.

[0042] The average thickness of th...

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Abstract

PROBLEM TO BE SOLVED: To provide a prism sheet which can prevent glaring of a screen and generation of an interference pattern, and can promote improvement of front brightness and reduction in size, and to provide a backlight unit for a liquid crystal display device using the same. SOLUTION: A prism sheet 1 includes: a transparent substrate layer 2; a bead-coated layer 3 which is stacked on the surface side of the substrate layer and has beads 7 dispersed in a binder 6; and a plurality of projecting prism portions 5 which are arranged in a stripe shape on the surface side of the bead-coated layer. A sheet-shaped portion 4 is arranged between the bead-coated layer and the projecting prism portions, and the sheet-shaped portion and the projecting prism portions are integrally formed with each other.

Description

technical field [0001] The invention relates to a prism sheet suitable for a backlight unit of a liquid crystal display device and a backlight unit for a liquid crystal display device using the prism sheet. Background technique [0002] A liquid crystal display device widely uses a backlight light source system that emits light from the back of the liquid crystal layer, and is equipped with a backlight unit such as an edge-light type or a direct-type type on the lower side of the liquid crystal layer. Equipped with an edge-type backlight unit 50 basically as figure 2 As shown, there is a linear lamp 51 as a light source, a square plate-shaped light guide plate 52 disposed along the end of the lamp 51, a light diffusion sheet 53 provided on the surface side of the light guide plate 52, and a light diffusion sheet 53 provided on the surface side of the light diffusion sheet 53. The prism sheet 54. [0003] The function of the backlight unit 50 will be described. First, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/04F21V5/02G02F1/13357
CPCG02B5/0242G02B5/045G02B6/0053
Inventor 原田贤一
Owner KEIWA INCORPORATED
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