Optical sheet and surface light source apparatus

An optical sheet, smooth surface technology, applied in the field of surface light source devices, can solve the problem of reducing the amount of light, and achieve the effects of high mechanical strength, high light export efficiency, and high uniformity

Inactive Publication Date: 2012-09-12
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, although the light-emitting layer itself of an organic EL element has a high luminous efficiency, the amount of light decreases due to interference in the layer during the period from passing through the laminated structure constituting the element until light is emitted. way of light loss

Method used

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  • Optical sheet and surface light source apparatus
  • Optical sheet and surface light source apparatus
  • Optical sheet and surface light source apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0181] (1-1. Resin composition (1))

[0182] Add particles (silicone resin) with a diameter of 2 μm to UV curable resin (refractive index 1.54) mainly composed of urethane acrylate, stir to disperse the particles, and prepare a resin composition for forming the material of the first light diffusion layer (1). The content of the particles was 10% by weight of the total amount of the resin composition (1). The viscosity of the resin composition (1) was 500 cP relative to the viscosity of the UV curable resin being 400 cP.

[0183] (1-2. Coating solution (2))

[0184] Mix methylcyclohexane and ethyl acetate at a ratio of 8:2 (weight ratio) to form a solvent, dissolve a resin mainly composed of acid-modified polyolefin resin (refractive index 1.49) in the solvent, and then add a 2 μm diameter Particles (silicone resin) are stirred to disperse the particles, and a coating solution (2) of a material for forming the second light-diffusing layer is prepared. The concentration of t...

reference example 1

[0222] The first light-diffusing layer and the second light-diffusing layer were produced in the same manner as in Example 1, except that the resin composition (1) and the content ratio of the particles added to the coating solution (2) were changed in various ways. An optical sheet and a surface light source device in which layers have different haze values. Each haze x1, x2 and the overall haze are shown in Table 2.

[0223] About these optical sheets and surface light source devices, it evaluated whether coating unevenness was observed on the surface by the side of a 1st light-diffusion layer by visual observation according to the following evaluation criteria.

[0224] Defective: Coating unevenness (approximately corresponding to 3% or more of light transmittance unevenness) was observed.

[0225] Good: Coating unevenness was not observed (approximately corresponding to light transmittance unevenness of less than 3%).

[0226] Moreover, about these optical sheets and sur...

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Abstract

Disclosed is an optical sheet which has: a transparent base material having the first surface (S1) and the second surface (S2); a first light diffusion layer provided on the surface (S1) side; and a second light diffusion layer provided on the surface (S2) side. The value of the haze of the first light diffusion layer1 (%) and the value of the haze of the second light diffusion layer2 (%) satisfy the following inequalities: f(1) / (f(1)+f(2))=2 / 3 (function f(x)=1.9(ln (1-x / 90))2 when x=88, and function f(x)=22.5x-1952.5 when x>88) and (f(1)+f(2)) =12. Also disclosed is a surface light source apparatus having the optical sheet.

Description

technical field [0001] The present invention relates to an optical sheet and a surface light source device including an organic electroluminescent (hereinafter referred to as "organic EL") element. Background technique [0002] The use of an organic EL element in which electroluminescence is obtained by disposing an organic light-emitting layer between multilayer electrodes is currently being studied as a display element instead of a liquid crystal cell. In addition, it is also being studied as an organic EL device for surface light source devices such as planar lighting and backlights for liquid crystal display devices. This organic EL device makes full use of its high luminous efficiency, low voltage drive, light weight, and low cost. feature. [0003] When an organic EL element is used as a light source of a surface light source device, it is a problem to efficiently extract light in a useful form from the element. For example, although the light-emitting layer itself o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02F21S2/00G02F1/13357H01L51/50H05B33/02F21Y105/00
CPCG02B5/0231G02F1/133602G02F1/133607H10K50/858
Inventor 井上弘康原井谦一
Owner ZEON CORP
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