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Optical slice and backlight unit using it

A technology of optical sheet and backlight unit, which is applied in optics, nonlinear optics, diffuser elements, etc. It can solve the problems of insufficient anti-adhesion function and insufficient prevention of optical sheet damage, etc., and achieves the effect of easy handling

Active Publication Date: 2011-05-25
KEIWA INCORPORATED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in the optical sheet provided with the above-mentioned damage prevention layer, since there are tiny beads for preventing adhesion, damage to other optical sheets, etc. cannot be sufficiently prevented.
In addition, when the unevenness is formed on the surface by the above-mentioned anti-blocking curable resin composition, the unevenness on the surface is too fine, and there is a problem that the adhesion preventing function is insufficient.

Method used

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  • Optical slice and backlight unit using it
  • Optical slice and backlight unit using it
  • Optical slice and backlight unit using it

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0114] Containing 100 parts of a binder resin compound ("Bylon" of Toyobo Co., Ltd.) with polyester polyol as a matrix material polymer, 50 parts of colloidal silica with an average particle diameter of 20 nm (Fuso Chemical Industry ( Co., Ltd. "PL-1"), 5 parts of hardener (Nippon Polyurethane Co., Ltd. "Coroneto HX"), and 5 parts of light stabilizer (Otsuka Chemical Co., Ltd. "PUVA-1033") In the composition, 50 parts of acrylic resin beads with an average particle diameter of 15 μm ("MBX-15" of Sekisui Chemical Industry Co., Ltd.) were mixed to prepare a coating solution, and the coating solution was rolled to 15 g / m 2 (in solid conversion) was applied on the surface of a transparent polyester base material layer ("A-4300" of Toyobo Co., Ltd.) having a thickness of 100 μm, and cured to form an optical layer.

[0115] In addition, as the coating solution for the anti-adhesion layer, 0.6 parts by mass of acrylic resin, 41.9 parts by mass of pentaerythritol triacrylate as a mo...

Embodiment 2

[0117] Except the coating amount of the coating liquid for the anti-adhesion layer is 0.5g / m 2 The optical sheet of Example 2 whose average thickness of the antiadhesion layer was 0.7 micrometers was obtained similarly to Example 1 except (in solid conversion).

Embodiment 3

[0119] Except the coating amount of the coating liquid for the anti-adhesion layer is 1g / m 2 The optical sheet of Example 3 whose average thickness of the antiadhesion layer was 1.4 micrometers was obtained similarly to Example 1 except (in solid conversion).

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Abstract

The invention provides an optical slice and a backlight unit using it, wherein the optical slice can prevent adhesion with other optical slices laminated at the back side of the slice, and can also prevent damages to surfaces of other optical slices and the like. The backlight unit has high quality, and with the optical slice, uneven brightness and the generation of interference fringes due to damages can be prevented. The optical slice is characterized in that the optical slice comprises a transparent matrix material layer, an optical layer laminated on one side of one surface of the matrix material layer, and an adhesion-preventing layer laminated on one side of the other surface of the matrix material layer, wherein the whole surface of the adhesion-preventing layer has a micro concave-convex shape; the average thickness of the adhesion-preventing layer is more than 0.5 microns and less than 4 microns; the average roughness (Ra) of the surface of the adhesion-preventing layer is more than 0.03 microns and less than 0.3 microns; and the average length of the roughness curve element (RSm) is more than 40 microns and less than 400 microns.

Description

technical field [0001] The present invention relates to an optical sheet having high anti-adhesion function and anti-damage function and a backlight unit equipped with it. Background technique [0002] Liquid crystal display devices are widely used in screen display devices such as televisions and personal computers, and are mainly divided into direct-view type for directly viewing a display screen and projection type for viewing images projected on a screen. Direct-view liquid crystal display devices include: a transmissive type that transmits light from a backlight; a reflective type that uses natural light and reflected light such as indoor lights without a backlight; and a reflective type in a bright place and a transmissive type in a dark place. Semi-transmissive type. On the other hand, projection-type liquid crystal display devices include a front type that projects images onto a front screen, and a rear type that projects images with a screen installed in a display ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02G02F1/13357B32B27/14B32B3/30
Inventor 野中忠幸原田贤一
Owner KEIWA INCORPORATED