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Light-diffusing film, manufacturing method therefor, light-diffusing polarizing plate, and liquid-crystal display device

A light-diffusing film and light-diffusing technology, applied to lighting devices, components of lighting devices, optics, etc., can solve problems such as whitening of the screen, reduction of frontal contrast of display images, and reduction of transmission clarity of display images, etc., to achieve Prevents whitening and has excellent light diffusion properties

Inactive Publication Date: 2012-07-11
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the existing light-diffusing film, if sufficient light-diffusing properties are given in order to obtain a wide viewing angle, the transmission sharpness of the displayed image decreases, and the front contrast of the displayed image also decreases. The diffuse reflection of the surface causes the entire screen to appear white, which is the so-called whitening (Japanese original: 白ちやけ) problem
Conversely, if sufficient clarity of transmission is to be imparted, the light diffusibility becomes insufficient, and a wide viewing angle cannot be obtained.

Method used

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  • Light-diffusing film, manufacturing method therefor, light-diffusing polarizing plate, and liquid-crystal display device
  • Light-diffusing film, manufacturing method therefor, light-diffusing polarizing plate, and liquid-crystal display device
  • Light-diffusing film, manufacturing method therefor, light-diffusing polarizing plate, and liquid-crystal display device

Examples

Experimental program
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Effect test

Embodiment 1

[0168] (1) Production of mirror metal rollers

[0169] The surface of an iron roll (STKM13A specified by JIS) with a diameter of 200 mm was subjected to industrial chrome plating, and then the surface was mirror-polished to produce a mirror-finished metal roll. The Vickers hardness of the chrome-plated surface of the obtained mirror-finished metal roller was 1,000. In addition, the Vickers hardness was measured according to JIS Z 2244 using an ultrasonic hardness meter MIC10 (manufactured by Krautkramer Co., Ltd.) (the method for measuring the Vickers hardness is the same in the following examples).

[0170] (2) Production of light diffusion film

[0171] Mix 60 weight parts of pentaerythritol triacrylate and polyfunctional urethane acrylate (1,6-hexamethylene diisocyanate and the reaction product of pentaerythritol triacrylate) 40 weight parts in the propylene glycol monomethyl ether solution, adjust solid content concentration to be 60% by weight to obtain an ultraviolet c...

Embodiment 2

[0176] A light-diffusing film was produced in the same manner as in Example 1 except that 35 parts by weight of polystyrene-based particles having a weight average particle diameter of 6.0 μm and a standard deviation of 2.19 μm were used as translucent fine particles.

Embodiment 3

[0178] (1) Production of metal rolls for embossing

[0179]A roll having a diameter of 200 mm of an iron roll (STKM13A specified by JIS) on the surface of which Ballard copper plating was provided was prepared. Ballard copper plating consists of copper plating / thin silver plating / surface copper plating, the thickness of the entire plating is about 200μm. Mirror-polish the surface of the copper coating, and then use a sandblasting device (manufactured by Fuji Manufacturing Co., Ltd.), with a sandblasting pressure of 0.05MPa (gauge pressure, the same below), and a particle usage of 16g / cm 2 (every 1cm 2 The use amount of the surface area of ​​the roller, the same below) was blasted on the polished surface with zirconia beads TZ-B125 (manufactured by Tosoh Corporation, average particle diameter: 125 μm), and irregularities were formed on the surface. Use a sandblasting device (manufactured by Fuji Manufacturing Co., Ltd.), with a blasting pressure of 0.1MPa and an amount of fin...

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Abstract

Provided is a light-diffusing film that is laminated on a substrate film and has a light-diffusing layer in which light-transmitting microparticles are diffused. Also provided are a method for manufacturing said light-diffusing film and a light-diffusing polarizing plate and liquid-crystal display device using said light-diffusing film. The ratio of the intensity of laser light transmitted from the light-diffusing layer side, in a direction 40 DEG off the normal direction, to the intensity of laser light incident upon the light-diffusing film from the substrate film side in the normal direction, said laser light having a wavelength of 543.5, is between 0.0002% and 0.001%. The transmission sharpness, summed over four optical combs, is between 70% and 180%. The total haze and internal haze levels are between 40% and 70%. The surface haze level due to the surface geometry of the light-diffusing layer is less than 2%. The centerline average roughness of the surface of the light-diffusing layer is no greater than 0.2 [mu]m.

Description

technical field [0001] The present invention relates to a light-diffusing film and a manufacturing method thereof. Moreover, this invention relates to the light-diffusing polarizing plate and liquid crystal display device using this light-diffusion film. Background technique [0002] In recent years, applications of liquid crystal display devices to mobile phones, monitors for computers, televisions, liquid crystal projectors, and the like have rapidly developed. The liquid crystal display device generally operates the liquid crystal in display modes such as TN (Twisted Nematic, twisted nematic) mode, VA (Vertical Alignment, vertical alignment) mode, IPS (In-Plane Switching, in-plane switching) mode, and the light passing through the liquid crystal Perform electrical control to show the difference between light and dark on the screen, thereby displaying characters and images. [0003] Conventionally, in liquid crystal display devices, it has been pointed out that there are...

Claims

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Application Information

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IPC IPC(8): G02B5/02F21S2/00F21V3/04G02F1/1335G02F1/13357F21Y103/00
CPCG02F1/133504G02B5/0242G02B5/0278
Inventor 羽场康弘宫本知典
Owner SUMITOMO CHEM CO LTD
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