Polarizing sheet capable of color conversion and liquid crystal display equipped with the polarizing sheet

• US 7,808,583 B2
• Filed: 05/02/2007
• Issued: 10/05/2010
• Est. Priority Date: 06/12/2006
• Status: Active Grant

• Current Assignee: Wintek Corporation
• Original Assignee: Wintek Corporation
• Inventors: Huang, Mei-Ju, Chang, Hui-Yu, Wang, Chih-Yuan
• Primary Examiner(s): KIANNI, KAVEH C
• Application Number:
  US11/797,244
• Publication Number:
  US 20070291196A1
• Time in Patent Office: 1,252 Days
• Field of Search: 349/96, 349/61
• US Class Current: 349/96
• CPC Class Codes: G02B 5/30 Polarising elements light-modulating devices with active elements G02F1/00
• CPC Class Codes: G02B 6/0056 for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing elements
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/133562 on the viewer side
• CPC Class Codes: G02F 1/133567 on the back side
• CPC Class Codes: G02F 1/133617 Illumination with ultraviolet light; Luminescent elements or materials associated to the cell

Abstract

The present invention provides a liquid crystal display with a polarizing sheet capable of color conversion. The liquid crystal display includes an upper polarizing sheet and a lower polarizing sheet, in one of which is provided with a conversion layer to absorb predetermined spectrum distribution energy of the light provided by the backlight module and to convert it to white light spectrum distribution.

Claims

1. A polarizing sheet, which has a first side and a second side opposite to the first side, comprising:

a polarizing base member; and

a conversion layer between the first side and the polarizing base member, which includes a conversion material to absorb spectrum distribution energy,

wherein the conversion material of the conversion layer is a light emitting material.

2. The polarizing sheet as defined in claim 1, wherein the first side is a light enter side, and the second side is a light output side.

3. The polarizing sheet as defined in claim 2, wherein the conversion material is made of a material chosen from yttrium aluminum garnet (YAG), terbium aluminum garnet (TAG), sulfide, oxide, halide, borate, borate mixed with fewer metal, halide mixed with fewer metal, YAG mixed with fewer metal, TAG mixed with fewer metal, sulfide mixed with fewer metal, oxide mixed with fewer metal, halide mixed with fewer metal or phosphate mixed with fewer metal, which are inorganic light emitting materials.

4. The polarizing sheet as defined in claim 2, wherein the conversion material of the conversion layer is an organic light emitting material chosen from pigment or dies to absorb visible light spectrum distribution energy.

5. The polarizing sheet as defined in claim 2, wherein the conversion material of the conversion layer is an inorganic light emitting material chosen from sulfide, oxide, halide, phosphate, borate, borate mixed with fewer metal, yttrium aluminum garnet (YAG) mixed with fewer metal, terbium aluminum garnet (TAG) mixed with fewer metal, sulfide mixed with fewer metal, oxide mixed with fewer metal, halide mixed with fewer metal or phosphate mixed with fewer metal to absorb UV light spectrum distribution energy.

6. The polarizing sheet as defined in claim 2, wherein the conversion material of the conversion layer is an organic light emitting material chosen from pigment or dies to absorb UV light spectrum distribution energy.

7. The polarizing sheet as defined in claim 2, wherein diameters of particles of the conversion material of the conversion layer are less than 1 μ

m.

8. The polarizing sheet as defined in claim 2, further comprising a barrier layer between the polarizing base member and the conversion layer.

9. The polarizing sheet as defined in claim 1, wherein the first side is a light output side, and the second side is a light enter side.

10. The polarizing sheet as defined in claim 9, wherein the conversion material is made of a material chosen from yttrium aluminum garnet (YAG), terbium aluminum garnet (TAG), sulfide, oxide, halide, borate, borate mixed with fewer metal, halide mixed with fewer metal, YAG mixed with fewer metal, TAG mixed with fewer metal, sulfide mixed with fewer metal, oxide mixed with fewer metal, halide mixed with fewer metal or phosphate mixed with fewer metal, which are inorganic light emitting materials.

11. The polarizing sheet as defined in claim 9, wherein the conversion material of the conversion layer is an organic light emitting material chosen from pigment or dies to absorb visible light spectrum distribution energy.

12. The polarizing sheet as defined in claim 9, wherein the conversion material of the conversion layer is an inorganic light emitting material chosen from sulfide, oxide, halide, phosphate, borate, borate mixed with fewer metal, yttrium aluminum garnet (YAG) mixed with fewer metal, terbium aluminum garnet (TAG) mixed with fewer metal, sulfide mixed with fewer metal, oxide mixed with fewer metal, halide mixed with fewer metal or phosphate mixed with fewer metal to absorb UV light spectrum distribution energy.

13. The polarizing sheet as defined in claim 9, wherein the conversion material of the conversion layer is an organic light emitting material chosen from pigment or dies to absorb UV light spectrum distribution energy.

14. The polarizing sheet as defined in claim 9, wherein diameters of particles of the conversion material of the conversion layer are less than 1 μ

m.

15. The polarizing sheet as defined in claim 9, further comprising a barrier layer between the polarizing base member and the conversion layer.