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Optical sheet and backlight unit using the same

A technology of optical sheets and optical layers, applied in optical components, optics, nonlinear optics, etc., to achieve excellent anti-adhesive properties, high anti-adhesive properties, and promote high brightness effects

Active Publication Date: 2010-01-20
KEIWA INCORPORATED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The disadvantages of the light diffusion sheet 53 also occur in optical sheets such as the prism sheet 54, or other microlens sheets, lenticular (lenticular) lens sheets, and Fresnel (Fresnel) lens sheets.

Method used

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  • Optical sheet and backlight unit using the same
  • Optical sheet and backlight unit using the same
  • Optical sheet and backlight unit using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0144] Polyethylene terephthalate (hereinafter referred to as "PET") is supplied to a T-die, extruded to form a PET film extruded body, and the PET film extruded body is stretched along the film length direction for 3 times. Next, in terms of solid content, 100 parts of polyester polyol ("Vylonal MD1250" manufactured by Toyobo Co., Ltd.), 120 parts of blocked isocyanate ("Elastron H-3" manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), and 50 parts of a composition for a release layer of colloidal silicon dioxide having an average particle diameter of 100 nm, which is coated on a PET film extruded body by a roll coating method to form the release layer A laminate of a layer of the layer composition and the extruded PET film. Next, the laminate was stretched 3 times in the film width direction to obtain a substrate sheet for an optical sheet with an average thickness of 188 μm (the average thickness of the release layer was 100 nm). The above steps are carried out conti...

Embodiment 2

[0147] The same release layer composition and PET as those used in Example 1 were respectively supplied to a multilayer mold and co-extruded to form an extrusion layer composed of a release layer composition layer and a PET film. A co-extruded body composed of a body. Then, the coextruded product was simultaneously biaxially stretched at a stretching ratio of 3 times in the film length direction and 3 times in the film width direction, thereby obtaining a substrate sheet for an optical sheet with an average thickness of 188 μm ( The average thickness of the release layer is 100 nm). The above steps are carried out continuously on the same production line.

[0148] Next, in the same manner as in Example 1, the above-mentioned composition for an optical layer was coated on the surface of the substrate sheet for an optical sheet to form an optical layer, and cut into a 20 cm square, thereby obtaining the composition of Example 2. optical sheet.

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Abstract

The invention provides an optical sheet having excellent viscosity resistance, high total light transmission ratio, capability of suppressing interference phenomenon and illumination unevenness and thereby having high economical efficiency and film property, and a backlight unit using the same. The optical sheet of the invention comprises a transparent substrate film, an optical layer laminated on one side of the substrate film, and an anti-adhesion layer laminated on the other side of the substrate film, wherein the anti-adhesion layer contains filler and resin bonding agent thereof; the average thickness of a flat part of the anti-adhesion layer is more than 50 nm but less than 150 nm; the average particle diameter of the filler is more than 70 nm but smaller than 200 nm; a small-diameter filler containing main ingredients and a big-diameter filler containing auxiliary ingredients are used as filler; the average particle diameter of the small-diameter filler can be set to be more than 50 nm but less than 150 nm.

Description

technical field [0001] The present invention relates to an optical sheet and a backlight unit using the same. Specifically, the present invention relates to an optical sheet having optical functions such as diffusing transmitted light, refracting toward the normal direction side, concentrating light, etc., and is especially suitable for liquid crystal displays. An optical sheet and a backlight unit in a device. Background technique [0002] In liquid crystal display devices, a backlight method in which the liquid crystal layer is irradiated from the back to make it emit light is widely used, and an edge-lit type, a direct type, or the like backlight unit is provided on the lower surface of the liquid crystal layer. The edge-illuminated backlight unit 50 is as Figure 5a As shown, it basically includes: a linear light source 51 as a light source, a square plate-shaped light guide plate 52 arranged so that its end portion runs along the light source 51 , and a light guide plat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02G02B3/00G02B5/04G02B3/08B32B7/12G02F1/1335
CPCG02B5/0226G02B5/045B32B27/08B32B2305/30B32B2307/21B29C48/08
Inventor 长村惠弌
Owner KEIWA INCORPORATED
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