Optical sheet, backlight unit for liquid crystal display apparatus and method for manufacturing optical sheet

A technology of optical sheets and optical functional layers, which is applied in the field of optical sheets, can solve problems such as the decrease of front brightness, and achieve the effect of improving quality and excellent optical functions

Active Publication Date: 2013-03-27
KEIWA INCORPORATED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the aforementioned resin bead-coated light-diffusing sheet 44, in order to improve the light-diffusing performance and to make the brightness uniform, etc., it is necessary to increase the amount of resin beads 50 added, but if the amount of resin beads 50 added is increased, , it will lead to a decrease in the brightness of the front

Method used

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  • Optical sheet, backlight unit for liquid crystal display apparatus and method for manufacturing optical sheet
  • Optical sheet, backlight unit for liquid crystal display apparatus and method for manufacturing optical sheet
  • Optical sheet, backlight unit for liquid crystal display apparatus and method for manufacturing optical sheet

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Effect test

Embodiment approach

[0083] The optical sheet of the present invention is not limited to the above-described embodiments, and the following embodiments may be employed.

[0084] image 3 The optical sheet 11 is a so-called light diffusion sheet, and includes a base material layer 2 and an optical function layer 13 arranged on the surface of the base material layer 2 . The optical function layer 13 includes: an adhesive part 14 ; a plurality of fibers 5 protruding from the base material layer 2 through the adhesive part 14 ; and air sandwiched between the plurality of fibers 5 . The base material layer 2, the manufacturing method of the sheet, the adhesive agent forming the adhesive portion 14, the material of the fiber 5, etc. are the same as those described above. figure 1 The optical sheets 1 are the same, so their descriptions are omitted.

[0085] The plurality of fibers 5 protrude from the surface of the base material layer 2 through the plurality of adhesive portions 14 provided in scatte...

Embodiment 1

[0103] Adhesive ("E263" manufactured by Dainichi Seika Co., Ltd.) is applied to the surface of the substrate layer by a roll coating method, and polyamide fibers are implanted by electrostatic tufting. The material of the substrate layer is polyethylene terephthalate, and the thickness is 100 μm. The surface density of the fiber substrate layer is 3500 fibers / cm 2 , with an average diameter of 10 μm and an average length of 50 μm.

[0104] The optical sheet of Example 1 was irradiated with a backlight, and the total light transmittance was measured in accordance with JIS K7361, and the result was 79%. In addition, haze was measured in accordance with JIS K7105, and the result was 86%.

Embodiment 2

[0106] Using the same substrate layer and adhesive as in Example 1, polyester fibers were implanted by electrostatic hair transplantation. The density of the surface of the fiber substrate layer is 3000 fibers / cm 2 , with an average diameter of 10 μm and an average length of 50 μm.

[0107] The optical sheet of Example 2 was irradiated with a backlight, and the total light transmittance was measured according to JIS K7361, and the result was 82%. In addition, haze was measured in accordance with JIS K7105, and the result was 87%.

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Abstract

The invention aims to provide an optical sheet with excellent optical properties, a backlight unit for a liquid crystal display apparatus and a method for manufacturing the optical sheet. The backlight unit for a liquid crystal display apparatus has high quality. The optical sheet of the invention comprises a transparent substrate layer and an optical functional layer with multiple fibers that are protrudingly arranged on a surface of the substrate layer. The optical functional layer may have an adhesive part for bonding the multiple fibers and the substrate layer. The adhesive layer can be laminated on a surface or a whole surface of the substrate layer and can be formed by an acrylic emulsion adhesive. The refractive index of the fibers ranges between 1.3 and 1.8. The density of the fibers in a unit area in the plane direction of the substrate layer ranges from 100 / cm2 to 500 / cm2.

Description

technical field [0001] The present invention relates to an optical sheet, a backlight unit using the same, and a manufacturing method of the optical sheet. Background technique [0002] As a transmissive liquid crystal display device, a backlight system in which the liquid crystal layer is irradiated from the back is popularized, and backlight units such as edge light type (side light type) and direct type are equipped on the surface side below the liquid crystal layer. Such as Figure 7 As shown, the edge light type backlight unit 40 is generally equipped with a lamp 41 as a light source, a square plate-shaped light guide plate 42 disposed along the lamp 41 at the end, and a light guide plate 42 on the surface of the light guide plate 42. A plurality of optical sheets 43 stacked on one side. LEDs (Light Emitting Diodes) or cold-cathode tubes are used as the lamp 41 as a light source, but LEDs are now becoming popular from the viewpoint of miniaturization and energy saving....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21V5/08F21S8/00G02F1/13357F21Y101/02
CPCG02F1/1336G02B6/0065G02B6/0005G02B6/0078G02B5/0221G02B6/0025G02B5/02G02B5/04G02F1/1335
Inventor 辻孝弘
Owner KEIWA INCORPORATED
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