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Light diffusion film and surface light source using the same

A light-diffusing film and light-diffusing technology, which is applied in the field of side-lit surface light sources and directly below-type surface light sources, can solve the problems of reducing the intensity of light output, improving the luminance, reducing light transmittance, etc., and achieving clear viewing , easy-to-see effects

Inactive Publication Date: 2008-09-03
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, if only the light diffusing property of the light diffusing plate is increased, the light transmittance will decrease, which reduces the effect of improving the luminance obtained by increasing the light emission intensity of the light source.

Method used

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  • Light diffusion film and surface light source using the same
  • Light diffusion film and surface light source using the same
  • Light diffusion film and surface light source using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0233] Supply to the extruder: with 99.93% by volume of polycarbonate as the main resin component constituting the light-diffusing film, with 0.07% by volume as the anatase type with an average particle diameter (diameter) of 1 micron as the light-diffusing element Titanium dioxide mixed balls. Next, melt extrusion was carried out, and a base material film was produced by cooling on a mirror-surfaced casting roll by an electrostatic application method.

[0234] Concave-convex shapes were formed on one surface of this base material film by the method described below. In addition, the die used here is a die made of nickel on which a curved surface represented by the following formula has been formed.

[0235] z=5×sin(0.0691×x)+5×sin(0.0628×y)

[0236] Here, z is the mold thickness direction, and x, y are the mold surface directions. Also, the units are microns.

[0237] First, the obtained base material film and the mold were heated to 180° C. for 2 minutes. Next, the shape...

Embodiment 1-2

[0241] Supply to the extruder: as the main resin component constituting the light-diffusing film, the PET (hereinafter referred to as SPG-PET) formed by copolymerizing 30 mol of spiroglycol to ethylene glycol unit is 99.2 volume %, as light The polymethylpentene of the diffusing element was mixed at 0.8% by volume as pellets. Next, melt extrusion was carried out, and a base material film was produced by cooling on a mirror-surfaced casting roll by an electrostatic application method.

[0242] Concave-convex shapes were formed on one surface of the substrate film by the same method as in Example 1-1.

[0243] Maximum value Asmax, minimum value Asmin, anisotropy, number density, area occupancy, transmittance, and haze of light-diffusing elements in the film cross-section of the obtained light-diffusing film , total thickness, as shown in Table 1. In addition, the transmittance and the haze are numerical values ​​measured by incident light from a surface formed with surface irr...

Embodiment 1-3

[0246] A pellet obtained by mixing 98.8% by volume of SPG-PET as a main resin component constituting the light-diffusing film and 1.2% by volume of polymethylpentene as a light-diffusing element was supplied to the extruder. Next, melt extrusion is carried out, and a base material film is produced by cooling on a mirror-surfaced casting roll by means of electrostatic application.

[0247] Concave-convex shapes were formed on one surface of the substrate film by the same method as in Example 1-1.

[0248] Maximum value Asmax, minimum value Asmin, anisotropy, number density, area occupancy, transmittance, and haze of light-diffusing elements in the film cross-section of the obtained light-diffusing film , total thickness, as shown in Table 1. In addition, the transmittance and the haze are numerical values ​​measured by incident light from a surface formed with surface irregularities. In addition, polymethylpentene was spherically dispersed as a result of cross-sectional obser...

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Abstract

Disclosed is a light diffusion film comprising a base film which contains a light diffusion element inside. This light diffusion film is provided with a rough surface having a ratio between the maximum value Asmax and the minimum valum Asmin of the average aspect ratio, namely Asmax / Asmin (anisotropic degree) of not less than 1.1 on at least one side. This light diffusion film is excellent in luminance uniformity and high luminance characteristics.

Description

technical field [0001] The present invention relates to a light-diffusing film that can be suitably applied to a surface light source (backlight) of a liquid crystal display, a light box, an electro-illuminated signboard device, a surface light source, and the like. In more detail, it relates to a light-diffusing film that can be suitably applied to the exit surface of a so-called direct-type surface light source or side-light-type surface light source, and a direct-type surface light source using the light-diffusing film. , Side-lit surface light source. Background technique [0002] In recent years, displays using liquid crystals have been widely used as display devices such as personal computers, televisions, and mobile phones. Since these liquid crystal displays are not illuminants themselves, they can be displayed by irradiating light from a surface light source from the inside. In addition, since the surface light source not only needs to irradiate light, but also ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02B29C55/02G02F1/13357B29L7/00B29L11/00G02F1/1335
Inventor 菊池朗和高桥宏光高桥弘造金子隆行
Owner TORAY IND INC
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