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Light-diffusing sheet having voids for TFT-LCD

A technology of astigmatism plates and pores, applied in optics, instruments, applications, etc.

Inactive Publication Date: 2008-07-23
TORAY ADVANCED MATERIALS KOREA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because there are many difficulties in actually achieving high brightness and LCD protection, such conventional technologies have experienced only improving the total light transmittance and its diffusivity by changing the composition of resin and particles in the light-scattering layer.

Method used

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  • Light-diffusing sheet having voids for TFT-LCD
  • Light-diffusing sheet having voids for TFT-LCD
  • Light-diffusing sheet having voids for TFT-LCD

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Production of Diffuser 1

[0046] Step 1: Substrate Preparation

[0047] Polyester resin containing silica particles with a diameter of 0.4 μm is mixed in a polymerization reaction, vacuum dried, dissolved, extruded through an extruder, and the melted hot polyester resin is formed into a plate by rotating a cooling roll and passing through a template . The polymer is brought into close contact with a cooling roll using an electrostatic process to obtain an elongated sheet of polyester resin. Preheating at 70-120°C, rolling the elongated polyester resin plate on a roll, and stretching it 3 times in the length direction to obtain a uniaxially stretched polyester resin film. After the film is sent into the heating zone at 80-150°C, the two edges of the uniaxially stretched polyester resin film are clamped with clips, and then the upper and lower blowing of the film is heated, and the The film was stretched 5 times across the width. Subsequently, the film was sent to ...

Embodiment 2

[0058] Production of Diffuser 2

[0059] The production method of the astigmatism plate with 1.2 μm pores is the same as in Example 1, except that the silicon dioxide particles with a diameter of 0.4 μm are used, and the stretching ratio of the substrate prepared in step 1 is changed to 4×5 times.

Embodiment 3

[0061] Production of Diffuser 3

[0062] The production method of the astigmatism plate with 1.4 μm pores is the same as in Example 1, except that silicon dioxide particles with a diameter of 0.6 μm are used, and the elongation ratio of the substrate prepared in step 1 is changed to 4×6 times.

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Abstract

Disclosed herein is a light-diffusing sheet, composed of a base sheet including a synthetic resin and organic particles or inorganic particles, in which voids are formed around the organic or inorganic particles, a light-diffusing layer laminated on one surface of the base sheet, and an antiblocking layer laminated on the other surface of the base sheet. In the light-diffusing sheet of this invention, since the voids are formed around the organic or inorganic particles in the base sheet, light transmittance and light diffusibility are increased via maximizing scattering and reflection upon passing light through the base sheet, in particular, the voids, thus providing a light-diffusing sheet capable of increasing the light efficiency of a backlight unit. Thereby, in the case where the light-diffusing sheet of this invention is applied to a backlight unit of a TFT-LCD, vivid and distinct images are realized throughout the surface of the display.

Description

technical field [0001] The present invention relates to the diffuser plate used for TFT-LCD (Thin Film Transistor Liquid Crystal Display) backlight unit, specifically a kind of diffuser plate, organic or inorganic particles are contained in the substrate, and pores are formed around the particles, through the substrate Light rays pass through the pores, thereby enhancing light transmittance and its diffusivity. Background technique [0002] Currently, liquid crystal display image output devices having low power consumption, low heat generation, and high resolution can be made ultra-thin, and are gaining attention in various industrial fields as image display devices. However, unlike other flat panel displays, when using a liquid crystal display, the liquid crystal itself does not emit light, and an additional light emitting unit is required to enhance the brightness of the display screen. [0003] As additional light-emitting units, light-emitting units used in the front-il...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/13357G02F1/136G02B5/00G02B1/04G02F1/1335G02B5/02
CPCG02B5/0226C08J5/18G02B5/0242G02B5/0247G02B5/0278G03B21/60A01K5/01A01K5/02
Inventor 金相弼李文馥
Owner TORAY ADVANCED MATERIALS KOREA