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Light-diffusing film laminate

A technology of light diffusing films and laminates, applied in optics, optical elements, nonlinear optics, etc., can solve the problems of improving the brightness of components, and achieve the effects of high brightness, performance improvement, and uniformity improvement.

Inactive Publication Date: 2016-03-16
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The technologies disclosed in the above-mentioned Patent Documents 7 and 8 are all evaluated only by overlapping the above-mentioned components or the surface light source unit, and neither mentions the brightness improvement effect brought about by the lamination of the components.

Method used

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Examples

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Embodiment

[0285] Hereinafter, examples are given to describe the present invention more specifically, but the present invention is not limited by the following examples, and can also be appropriately modified and implemented within the scope of the gist of the present invention, and these are included in the technical scope of the present invention. In addition, the measurement and evaluation methods used in the Examples are as follows. In addition, in the examples, "parts" means "parts by mass" unless otherwise stated, and "%" means "mass%" unless otherwise stated.

[0286] 1. Total light transmittance

[0287] A device with an integrating sphere (ISR-3100; manufactured by Shimadzu Corporation) was installed in a self-recording spectrophotometer (UV-3150; manufactured by Shimadzu Corporation), and a wavelength of 300 to 800 nm was scanned at high speed with a slit width of 12 nm. range, spectroscopic measurement is performed, expressed as the transmittance at 550nm.

[0288] In this ...

manufacture example 1

[0349] Using two melt extruders, 35 parts by mass of a cyclic polyolefin resin (TOPAS(TM) 6013S-04 manufactured by Topas Advanced Polymers, melt flow rate: 2.0 (230° C.)) was mixed with ethylene and 65 parts by mass of block copolymer resin (INFUSE(TM) D9817.15 manufactured by Dow Chemical Co., Ltd., melt flow rate: 26 (230° C.)) formed of octene was used to form a light diffusion layer, and the second extruder was used. After making the polypropylene adhesive resin (Adomer(TM) SE800, manufactured by Mitsui Chemicals Co., Ltd., melt flow rate: 5.7 (190° C.)) two surface layers, melt and co-extrude it with a T-die, and then use The internal light-diffusion film which laminated|stacked the heat-adhesive layer on both surfaces with a total thickness of 400 micrometers was obtained by cooling with a mirror-surface cooling roll. Adhesion between the film and the cooling roll during the above-mentioned cooling is performed using a vacuum chamber. The layer thickness composition was...

manufacture example 2

[0352]Cyclic polyolefin-based resin (TOPAS (TM) 6015 manufactured by Topas Advanced Polymers, melt flow rate: 0.41 (230° C.)) 50 parts by mass and block copolymer resin composed of ethylene and octene (INFUSE manufactured by Dow Chemical Company ( TM) D9817.15 melt flow rate: 26 (2300)) 50 parts by mass, melted and mixed with the extruder PCM45 manufactured by Ikegai Iron Works Co., Ltd. at a resin temperature of 250° C., extruded with a T-shaped die, and used The textured cooling roll (Ra=0.55) cooled to obtain an inner light-diffusing film having a thickness of 400 μm. In addition, the surface opposite to the said cooling roll used the squeeze roll which performed the mold release process (Ra=1.0) on the surface.

[0353] Table 1 shows the properties of the obtained inner light-diffusing film.

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Abstract

The present invention provides a light-diffusing film laminate having specific optical characteristics and a structure that have high brightness and illuminance when used in a surface light source device, and can reduce luminance unevenness and illuminance unevenness. The light-diffusing film laminate of the present invention is characterized in that it is an internal light-diffusing film (A) satisfying the following (i) to (iii) and a substrate having a total light transmittance of 50 to 100% at 550 nm ( C) laminated, and there is no air layer at the interface between the two, (i) the total light transmittance of light with a wavelength of 550nm is 40% to 84%; (ii) the light with a wavelength of 550nm in the main diffusion direction is at an angle of The transmittance (I30) under 30 degrees is 8.0~95% with respect to the ratio (I30 / I0*100) of the transmittance (I0) under the outgoing angle 0 degree; (iii) the variable curvature of the light of the wavelength of 550nm is 4.0 to 100%.

Description

technical field [0001] The present invention relates to a light-diffusing film laminate, a surface light source device using the light-diffusing film laminate, and a display device or lighting device using the light-diffusing film laminate, when the light-diffusing film laminate is used in a surface light source device Brightness and illumination are high and can reduce brightness spots and illumination spots. Background technique [0002] Liquid crystal display modules (LCD) take advantage of features such as thinness, light weight, and low power consumption. Most of them are used as flat panel displays, and their applications are expanding year by year to information display devices such as mobile phones, portable information terminals (PDAs), personal computers, and televisions. . [0003] In order to suppress the loss in the light transmission path from the light source to the panel and improve the brightness on the panel, a surface light source device is provided on th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/02
CPCG02B5/0268G02B5/0278G02F1/133606G02B5/02G02F1/1335
Inventor 久世胜朗河井兼次松田明
Owner TOYOBO CO LTD
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