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Light-compensating silver reflective sheet for backlight unit of liquid crystal display device

A technology of liquid crystal display and backlight unit, which is applied to optical elements, optics, instruments, etc., can solve the problems of low color uniformity and inability to apply edge-lit backlight structure, etc.

Active Publication Date: 2018-04-27
UB LIGHT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Patent Literature Japanese Laid-Open Patent Application No. 6-15774 discloses a method of coating a resin protective layer containing white pigments on a plastic film laminated with a silver film in order to enhance the diffuse reflectance of light, but the color uniformity is still low Therefore, it cannot be applied to a short-side or large-scale edge-lit backlight structure

Method used

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  • Light-compensating silver reflective sheet for backlight unit of liquid crystal display device
  • Light-compensating silver reflective sheet for backlight unit of liquid crystal display device
  • Light-compensating silver reflective sheet for backlight unit of liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Mix blue pigment CI Bule 15:3 and purple pigment CI Violet23 in the coating liquid that contains polyester resin 100 weight percent and organic solvent to prepare light correction liquid cloth liquid. Add 5% by weight of blue color to 100% by weight of polyester resin, and add 0.1% by weight of purple pigment.

[0063] On the reflective layer of the silver reflective layer with a reflectivity of more than 95% and a thickness of 200um in a wavelength of 580nm~600nm, the optical correction coating liquid is coated with a rod coater, and then heated and dried to form a light correction layer with a thickness of 2um.

[0064] After using Minolta CM-3600d to measure the spectral reflectance, the reflectance in the wavelength of 580~600nm can reach 83~85%. At this time, the CIE color coordinates of the fabric are -1.85 for a* and -4.6 for b*.

[0065] After coating the transparent polyester adhesive with a transmittance of 98% on the light correction layer to a thickness of 2...

Embodiment 2

[0072] Example 2 is coated according to the method of Example 1, so that the thickness of the light correction layer reaches 4um, so that the reflectivity in 580~600nm reaches 81~82%. At this time, the CIE color coordinates of the fabric are -2.07 for a* and -5.26 for b*.

[0073] The transparent acrylic adhesive was then coated to a thickness of 20um and measured as in Example 1.

Embodiment 3

[0085] In embodiment 3, after the formation of the light correction layer in embodiment 1, the acrylic adhesive with a thickness of 20 um is coated on the light correction layer of a reflective film with a reflectivity of 580nm to 600nm at a wavelength of 83 to 85%, and then the adhesion is tested. (180 degree peeling, KS specification) test. At this time, the adhesive force was 1,100 gf / 25mm.

[0086] Cut this sample into 2mm x 450mm and stick it on the light-receiving part of the light guide plate, and perform a light-on appearance inspection. In order to evaluate the reliability of the adhesion, put it in the state of the backlight unit (BLU) at a temperature of 85°C and a humidity of 85°C. %Rh environment, the adhesion state of the acrylic adhesive was visually observed.

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Abstract

In order to solve the problem with a one side edge-lit BLU in that color uniformity and luminance are lowered, the present invention aims to provide a light-compensating silver reflective sheet installed at an edge opposite to the light source and comprises: a silver reflective layer having a silver thin film layer formed on a resin film; and a light compensating layer formed on the silver reflective layer by mixing a pigment and a synthetic resin, wherein the pigment has a color complementary to a color shown by the LCD backlight unit (BLU) to make color compensation.

Description

technical field [0001] The invention relates to a light-correcting silver reflector used in the backlight unit of a liquid crystal display, in particular, to solve the problem of low color uniformity and brightness in an edge-type backlight structure, which is arranged on the opposite side of the light source for Light-correcting silver reflectors for LCD backlight units. Background technique [0002] As liquid crystal displays become lighter and thinner, an edge-lit liquid crystal display in which a light source is provided at a peripheral portion in a direct-lit backlight structure has been developed. From the perspective of saving cost and energy, the edge-lit liquid crystal display sets the light source on one side of the four sides, and in order to further save, it is not set on one long side, but as figure 1 As shown, change to a side-lit liquid crystal display with a short side. [0003] Not only one short side, but with the enlargement of liquid crystal display (LC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/08G02F1/13357
CPCG02B5/0866G02F1/133605G02B5/08G02F1/1335
Inventor 李东春许承焕李宗祐
Owner UB LIGHT CO LTD