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Planar light source and display device using it

A technology of planar light sources and components, which is applied in the direction of light sources, electric light sources, static indicators, etc., can solve the problems of undisclosed and unmentioned color conversion methods, unsuitable for color displays, etc., to prolong life, reduce operating voltage or current Effect

Inactive Publication Date: 2004-07-14
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this document neither discloses nor mentions the aforementioned color conversion method
Therefore, this method has disadvantages as it is not suitable for color displays

Method used

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  • Planar light source and display device using it
  • Planar light source and display device using it
  • Planar light source and display device using it

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0133] (1) Preparation of organic EL elements

[0134] An ITO ceramic target (In2O3:SnO2=90wt%:10wt%) was used to DC sputter one side of the glass substrate to form a transparent electrode (anode) made of an ITO layer with a thickness of 100nm. Then, the ITO layer is etched with photoresist to form a pattern with an area of ​​15 mm×15 mm. Then, the ITO layer is ultrasonically cleaned, and then a low-pressure UV lamp is used for ozone cleaning. Then, the organic thin layer was vacuum deposited on the ITO layer under the following conditions.

[0135] Specifically, CuPc (Chemical Formula 1) was vacuum-deposited on the ITO layer to form a hole injection layer with a deposition rate of 0.3 nm / s and a final thickness of 15 nm.

[0136] [Chemical formula 1]

[0137]

[0138] Then α-NPD (Chemical Formula 2) was vacuum-deposited on the CuPc layer to form a hole transport layer with a deposition rate of 0.3 nm and a final thickness of 50 nm.

[0139] [Chemical formula 2]

[0140]

[01...

Embodiment 2

[0167] The anisotropic scattering film was prepared in the same manner as the preparation of the anisotropic scattering color conversion layer in step (2) of Example 1, except that 3-(2-benzothiazolyl)-7- represented by the chemical formula (5) was not added. Diethylaminocoumarin (Coumarin 6). Then, the transparent color conversion film prepared in Comparative Example 2 without light scattering phenomenon was adhered to the glass substrate of the organic EL element with a transparent acrylate adhesive layer inserted between the two. The preparation method of the organic EL element is the same as Example 1 is the same. Then, an acrylate transparent adhesive layer inserted between the two is used to adhere the anisotropic scattering film to the color conversion film.

[0168] Under these conditions, a voltage of 10V was then applied to the organic EL element. The results show that the current flowing through the organic EL element is basically at the same order of magnitude as that ...

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Abstract

A planar light source has a solid light-emitting element which emits light by electric energy and an anisotropic scattering color conversion layer formed on the light-emitting side of the solid light-emitting element with substantially no air layer interposed therebetween. The anisotropic scattering color conversion layer has a light-transmitting resin, a microregion dispersedly distributed in the light-transmitting resin having birefringence different from that of the light-transmitting resin and at least one light-emitting material incorporated in the light-transmitting resin and / or microregion and the at least one light-transmitting material absorbs light emitted by the solid light-emitting element as excitation light to emit fluorescence or phosphorescence.

Description

[0001] This application is based on Japanese Patent Application 2002-377141, which is incorporated herein by reference. Technical field [0002] The present invention relates to a flat light source and a display device containing the flat light source. More specifically, the present invention relates to a flat light source, which causes a light-reflecting material contained in a light-transmitting resin with anisotropic scattering properties to emit light, and a solid state The light emitted by light-emitting elements such as organic electroluminescent elements (organic EL elements) is excitation light, which realizes the emission of natural light, which is partially polarized light with other wavelength ranges extracted from solid-state light-emitting elements. Specified linearly polarized light component, and a high-efficiency display device containing the planar light source. Background technique [0003] When a voltage is applied to the light-emitting layer placed between the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/13G02F1/13357H01L27/32H01L51/50H01L51/52H05B33/12H05B33/22
CPCH01L51/5262G02F1/133603H01L51/5268H01L27/322H01L51/5036H01L51/5016H10K59/38H10K50/125H10K50/11H10K2101/10H10K50/854H05B33/22H10K50/85
Inventor 中村年孝宫武稔
Owner NITTO DENKO CORP
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