Base sheet for optical sheet

A technology of optical sheets and substrates, applied in optics, optical components, nonlinear optics, etc., can solve problems such as decreased brightness and uneven brightness of liquid crystal display devices, achieve high total light transmittance, excellent anti-adhesive properties, and promote high The effect of brightness

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

If the back of the anti-adhesive layer 57 is damaged, the brightness of the screen of the liquid crystal display device may decrease due to light scattering, and problems such as uneven brightness may occur.

Method used

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  • Base sheet for optical sheet
  • Base sheet for optical sheet
  • Base sheet for optical sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] Polyethylene terephthalate (hereinafter referred to as "PET") is supplied to a T-die and extruded to form a PET film extrusion, which is stretched 3 times along the film length direction . 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 is 100 nm). The above steps are carried out continuously on the same production...

Embodiment 2

[0107] The same release layer composition and PET used in Example 1 were supplied to a multi-layer mold and co-extruded to form an extruded body consisting of a release layer composition layer and a PET film. A coextrusion formed of layers. 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.

[0108] The base sheet for optical sheets was cut into a 20 cm square, and no interference pattern was generated even if the release layer was overlapped with the acrylic plate, and the release effect was good. Also, the substrate sheet for optical sheets cut out in the above-mentioned manner was superimposed on the acrylic plate in a state where the...

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Abstract

The invention provides a base sheet for optical sheet having excellent antisticking properties, high total transmittance, capability of inhibiting interference phenomenon and uneven brightness, and high economical efficiency and membrane permeability, consisting of a transparent base film and an antisticking layer laminated on one surface of the base film, and characterized in that the antisticking layer has filling materials and resin binder; the average thickness of the flat part of the antisticking layer is more than 50nm and less than 15nm; the average grain diameter of the filling materials is more than 70nm and less than 200nm; the average grain diameter of the filling materials can be larger than the average thickness of the flat part of the antisticking layer; the content of the filling materials of the antisticking layer is preferably more than 20 mass percent and less than 50 mass percent; and bonder polymer can have a three-dimensional crosslinking structure.

Description

technical field [0001] The present invention relates to a base material sheet for an optical sheet, in particular, to an optical sheet having optical functions such as diffusing transmitted light, refracting toward the normal direction side, and concentrating light, and is particularly suitable for use in liquid crystal display devices. A substrate sheet for the sheet. Background technique [0002] In liquid crystal display devices, a backlight system in which the liquid crystal layer is irradiated from the back to emit light is commonly 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 4a 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 plate laminated on the light guide plate 52 . multip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02G02B5/04G02B3/00G02B5/08G02F1/1335B32B7/12
CPCB32B7/02B32B27/20B32B2307/21G02B5/0242G02B5/045G02B6/0053G02F1/133607
Inventor 长村惠弌
Owner KEIWA INCORPORATED
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