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White phosphor, light emission device and liquid crystal display device

By using a white phosphor prepared by mixing blue phosphor, green phosphor and red phosphor as the backlight unit of the liquid crystal display, the problems of high power consumption and limited dynamic contrast of the image dynamic contrast of the liquid crystal display backlight unit in the existing technology are solved, achieving for higher image quality and color reproduction characteristics.

Inactive Publication Date: 2009-07-15
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conventional backlight unit cannot achieve the above functions, so it is limited in the dynamic contrast of the image

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0075] 43.8 parts by weight of ZnS:(Ag, Al) blue phosphor, 29.3 parts by weight of ZnS:(Cu, Al) and (Sr 0.9 Ca 0.1 ) Ga 2 S 4 : Eu green phosphor and 26.9 parts by weight of Y 2 o 3 :Eu red phosphor is mixed to prepare white phosphor. A rectangular electrode layer is formed on a substrate, and a white phosphor is applied on the substrate, thereby preparing a white phosphor layer.

[0076] Subsequently, Al was deposited on the white phosphor layer by chemical vapor deposition (CVD), thereby forming a metal reflective layer. The obtained structure was baked at 480° C. for 0.5 to 1 hour, thereby preparing a light-emitting unit.

example 2

[0078] The light-emitting unit was manufactured according to the same method as Example 1, except that 45.4 parts by weight of ZnS:(Ag, Al) blue phosphor, 28.5 parts by weight of ZnS:(Cu, Al) and ( Sr 0.9 Ca 0.1 ) Ga 2 S 4 : Eu green phosphor and 26.2 parts by weight of Y 2 o 3 : Other than Eu red phosphor.

example 3

[0080] The light-emitting unit was manufactured according to the same method as Example 1, except that 46.9 parts by weight of ZnS:(Ag, Al) blue phosphor, 27.8 parts by weight of ZnS:(Cu, Al) and ( Sr0 9 Ca 0.1 ) Ga 2 S 4 : Eu green phosphor and 25.3 parts by weight of Y 2 o 3 : Other than Eu red phosphor.

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Abstract

A white phosphor, a light emission device including the same, and a liquid crystal display (LCD) including the light emission device as a backlight unit. The white phosphor includes: 40 to 50 parts by weight of a blue phosphor selected from the group consisting of ZnS:(Ag,Cl), ZnS:(Ag,Al), ZnS:(Ag,Al,Cl), and a combination thereof; 23 to 36 parts by weight of a green phosphor including (Sr1-xCax)Ga2S4:Eu (0<=x<0.2) and a compound selected from the group consisting of ZnS:(Cu,Al), ZnS:(Cu,Au,Al), and a combination thereof; and 20 to 30 parts by weight of a red phosphor selected from the group consisting of Y2O3:Eu, Y2O3:(Eu,Tb), Y2O2S:Eu, Y2O2S:(Eu,Tb), and a combination thereof.

Description

technical field [0001] The present invention relates to a white phosphor, a light emitting device including the white phosphor, and a liquid crystal display (LCD) including the light emitting device as a backlight. Background technique [0002] A liquid crystal display is a type of flat panel display device that displays an image by changing the light transmission amount of a pixel by changing the orientation of liquid crystal according to an applied voltage using dielectric anisotropy. Liquid crystal displays are lighter, smaller and use less power than conventional cathode ray tubes. [0003] A liquid crystal display includes a liquid crystal (LC) panel assembly and a backlight unit. The backlight unit projects light to the LC panel assembly, and the LC panel assembly selectively transmits light using a liquid crystal layer. [0004] Backlight units are classified according to the type of light sources included therein, such as cold cathode fluorescent lamps (CCFLs). Si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/84C09K11/78C09K11/64C09K11/61H01J63/06G02F1/13357
CPCC09K11/7789C09K11/584C09K11/7787H01J1/63C09K11/612C09K11/642C09K11/7731B82B3/00C09K11/08C09K11/54
Owner SAMSUNG SDI CO LTD
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