Optical sheet and surface light source apparatus

An optical sheet and one-sided technology, applied in the direction of electroluminescent light source, optics, light source, etc., can solve the problem of increased light loss, achieve the effect of small color change, reduce surface unevenness, and improve light extraction efficiency

Inactive Publication Date: 2015-04-08
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, although the luminous efficiency of the light-emitting layer itself of an organic EL element is high, due to conditions such as the difference in refractive index between the layers constituting the element, the light loss between the time when light passes through the layer and the time it exits increases.

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

[0171] (1-1. Coating solution (1))

[0172] Add particles (silicone resin, refractive index 1.43) with a number average particle diameter of 4.5 μm as first diffusion particles to resin (UV curable resin mainly composed of urethane acrylate, refractive index after curing: 1.54) , stirring was performed to disperse the particles, and a coating solution (1) to be a material of the light diffusion layer was prepared. The content of the particles was set at 50% by weight of the total amount of the coating liquid (1).

[0173] (1-2. Coating solution (2))

[0174] Dissolve a resin (refractive index 1.48) mainly composed of acid-modified polyolefin polymer as a binder in a solvent mixed with methylcyclohexane and ethyl acetate at a ratio of 8:2 (weight ratio), Further, particles having a number average particle diameter of 0.6 μm (silicone resin, refractive index 1.43) as second diffusion particles and zirconia particles (number average particle diameter 20 nm, refractive index 1.9...

Embodiment 2

[0201] In the step (1-1), as the first diffusion particles, instead of particles having a number average particle diameter of 4.5 μm, particles having a number average particle diameter of 1.7 μm (silicone resin, refractive index 1.43) were used, and in addition, It carried out similarly to the process (1-1) - process (1-9) of Example 1, the optical sheet, the surface light source device, and other samples for research were produced and evaluated. The results are shown in Table 1.

[0202] In this example, the thickness of the light-diffusing layer obtained in step (1-5) was 15 μm, and a concavo-convex structure with Ra=0.3 μm was formed on the surface.

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Abstract

An optical sheet comprising: a transparent substrate; a light diffusion layer having a surface roughness structure which is provided on one surface of the transparent substrate; and a light diffusion adhesive layer provided on the other surface of the transparent substrate, wherein the light diffusion layer comprises a resin and first diffusion particles having a number-average particle size of 1.7 mum or above, the light diffusion adhesive layer comprises a binder, highly refractive nanoparticles and second diffusion particles, and the relationship x1 > x2 is satisfied, where the haze of the light diffusion layer is x1 (%) and the haze of the light diffusion adhesive layer is x2 (%); and a surface light source apparatus provided with said optical sheet and an organic electroluminescent light-emitting element.

Description

technical field [0001] The present invention relates to a surface light source device including an optical sheet and an organic electroluminescent (hereinafter referred to as "organic EL") element. Background technique [0002] An organic EL element in which an organic light-emitting layer is provided between multilayer electrodes to obtain electroluminescence has been studied as a display element instead of a liquid crystal cell. In addition, the use of organic EL devices as surface light source devices such as planar lighting and backlights for liquid crystal display devices has also been studied by taking advantage of features such as high luminous efficiency, low-voltage driving, light weight, and low cost. [0003] When an organic EL element is used as a light source of a surface light source device, it becomes a problem to extract light of a useful form from the element efficiently. For example, although the light-emitting layer itself of an organic EL element has hig...

Claims

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Application Information

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IPC IPC(8): G02B5/02F21V3/04H01L51/50H05B33/02
CPCH01L51/5268H01L51/524G02B5/0242H01L51/5275G02B5/0278H01L2251/5369F21V3/06H05B33/02H10K50/11H10K50/841H10K50/854H10K50/858G02B5/0226H10K2102/331F21V5/002
Inventor 井上弘康
Owner ZEON CORP
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