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Optical sheet for surface light source apparatus

An optical sheet and transparent technology, applied in optics, nonlinear optics, planar/plate light guides, etc., can solve problems such as brightness reduction, achieve the effects of enhancing brightness and viewing angle, reducing production costs, and reducing the thickness of backlight units

Inactive Publication Date: 2014-07-30
SKC HAAS DISPLAY FILMS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case where several different types of sheets are combined to form a single composite sheet, there is a problem of reduced brightness due to optical loss

Method used

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  • Optical sheet for surface light source apparatus
  • Optical sheet for surface light source apparatus
  • Optical sheet for surface light source apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] Hereinafter, each component of the optical sheet of the present invention will be described in detail.

[0031] (1) Transparent support film

[0032] The transparent supporting film used in the present invention is mainly transparent plastic. The transparent support film must have good adhesion and surface smoothness for the adhesive resin with a rear incident light transmittance of more than 90% to prevent brightness changes. The thickness of the transparent supporting film is preferably between 50-250 μm. The materials suitable for the transparent support film include polyethersulfone (PES), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyethylene terephthalate Alcohol ester (PET), polyphenylene sulfide (PPS), polyallylate (polyallylate), polyimide, polycarbonate (PC), triacetate cellulose (TAC), cellulose acetate propionate (CAP ) and mixtures thereof, preferably PET.

[0033] (2) Diffusion layer

[0034] In the present invention, t...

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Abstract

The present invention relates to an optical sheet including: (1) a transparent supporting film; (2) a diffusion layer which is located on one surface of the transparent supporting film, and diffuses a light; (3) a pattern layer which is located on another surface of the transparent supporting film, and includes multiple protrusion patterns with same heights; and (4) a base layer which is located on the pattern layer in parallel with the transparent supporting film, and is formed to allow a part of a space with the pattern layer so that only a part of an upper part including an uppermost part of the multiple protrusion patterns is invaded into the inside and exists. The optical sheet according to the present invention can reduce costs and thickness of a backlight unit, by replacing several sheets of optical films used in the backlight unit, because the optical sheet can perform a light collection function and a light diffusion function in one optical sheet. Also, the optical sheet can be used as an optical sheet for a surface light source apparatus, because the optical sheet can provide excellent optical luminance and viewing angle characteristics.

Description

technical field [0001] The invention relates to an optical sheet for enhancing brightness in a surface light source device using a light source on the side, especially in a backlight device of a liquid crystal display. Background technique [0002] Liquid crystal display (LCD), one of the most widely used flat panel displays, is a light-receiving device that displays images by controlling the amount of light it receives from an external source, so it requires a backlight unit (BLU) to maintain uniform brightness. [0003] The BLU is a device that illuminates the LCD. The LCD itself does not generate light, but provides light to display information in a displayable image. It's called the "backlight unit" because it's on the back of the LCD. [0004] Small fluorescent lamps or light emitting diodes (LEDs) are often used as light sources for backlight units; however, they are line or point light sources. This light source needs to be converted into a surface light source use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02G02B5/04F21V3/00
CPCG02F1/133504G02F1/133615G02B6/005
Inventor 赵炫奭车孝吉柳永彬姜昌昊南贤哲
Owner SKC HAAS DISPLAY FILMS CO LTD
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