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Phosphor mixture and back light source for liquid crystal display

A liquid crystal display, phosphor technology, applied in the direction of electroluminescence light source, light source, electric light source, etc., can solve the problem of not saving energy

Inactive Publication Date: 2008-10-15
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as shown in Figure 1, because Y 3 Al 5 o 12 : The emission spectrum of Ce cannot be concentrated in the wavelength range specific to the color filter used in general (about 440-460nm, about 550-570nm, about 630-680nm), so the system is not energy-saving

Method used

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  • Phosphor mixture and back light source for liquid crystal display
  • Phosphor mixture and back light source for liquid crystal display
  • Phosphor mixture and back light source for liquid crystal display

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Embodiment Construction

[0018] The present invention provides phosphor compositions for use in backlights in LCDs.

[0019] The phosphor composition of the present invention includes at least one blue-emitting phosphor, at least one green-emitting phosphor, and at least one red-emitting phosphor. The blue emitting phosphor is selected from (Sr, Ca, Ba, Mg) 10 (PO 4 ) 6 (F, Cl, Br, OH):Eu 2+ ;(Ba,Sr,Ca)MgAl 10 o 17 :Eu 2+ ;(Sr, Ca) 10 (PO 4 ) 6 ·nB 2 o 3 :Eu 2+ , where, 02 o 5 0.16B 2 o 3 :Eu 2+ ;Sr 2 Si 3 o 8 2SrCl 2 :Eu 2+ ;Ba 3 MgSi 2 o 8 :Eu 2+ ;Sr 4 al 14 o 25 :Eu 2+ ;BaAl 8 o 13 :Eu 2+ ; and mixtures thereof. The green-emitting phosphor is selected from (Ba, Sr, Ca)MgAl 10 o 17 :Eu 2+ , Mn 2+ ;(Ba,Sr,Ca)Al 2 o 4 :Eu 2+ ;(Y,Gd,Lu,Sc,La)BO 3 : Ce 3+ , Tb 3+ ;(Ba,Sr,Ca) 2 SiO 4 :Eu 2+ ;(Ba,Sr,Ca) 2 (Mg, Zn)Si 2 o 7 :Eu 2+ ;(Sr, Ca, Ba)(Al, Ga, In) 2 S 4 :Eu 2+ ;(Y, Gd, Tb, La, Sm, Pr, Lu) x (Al, Ga, In) y o 12 : Ce 3+ , wherein, x is about 2.8...

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Abstract

A phosphor composition that comprises at least one phosphor emitting in each of the blue, green, and red regions of the visible spectrum is disposed adjacent to a backlight source of a color liquid crystal display. The phosphor composition emits strongly in the wavelength ranges of color filters used in such display. The backlight source includes either a semiconductor light-emitting diode or an organic light-emitting device.

Description

[0001] This invention was first conceived or worked out under Contract 70NANN8H4022 awarded by the United States National Institute of Standard and Technology. The United States has certain rights in this invention. Background technique [0002] Generally, the present invention relates to liquid crystal displays ("LCDs") and backlight sources thereof. In particular, the invention relates to phosphor blends for improved backlighting of color LCDs. [0003] In the electronics industry, LCDs are widely used in products ranging from mobile phones, calculators, and watches to information displays in computers and automobiles. LCDs offer several advantages over competing display technologies in areas such as size, cost, design, flexibility, reliability, and power consumption. These advantages make LCDs a popular choice for designers of electronic devices. [0004] Liquid crystal materials are characterized in that the application of an electric field to the material alters the li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1335G02F1/13357C09K11/08C09K11/56C09K11/57C09K11/59C09K11/61C09K11/64C09K11/66C09K11/71C09K11/73C09K11/77C09K11/78C09K11/80C09K11/82C09K11/84F21S2/00F21Y101/02F21Y105/00H01J61/44H01L51/50H05B33/12H05B33/14
CPCC09K11/7734C09K11/57C09K11/0844C09K11/774C09K11/7739C09K11/7738G02F1/133617H05B33/14C09K11/778C09K11/77342C09K11/77
Inventor 阿纳尼·A·塞特卢尔阿洛克·M·斯里瓦斯塔瓦霍利·A·科曼佐
Owner GENERAL ELECTRIC CO