Color substrate, manufacturing method thereof and liquid crystal display

• US 8,314,903 B2
• Filed: 12/12/2008
• Issued: 11/20/2012
• Est. Priority Date: 12/19/2007
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Shao, Xibin, Liu, Jingwei, Wang, Gang, Liu, Xiaodong, Wang, Jiaheng
• Primary Examiner(s): Chen, Wen-Ying P
• Application Number:
  US12/334,396
• Publication Number:
  US 20090161035A1
• Time in Patent Office: 1,439 Days
• Field of Search: None
• US Class Current: 349/106
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133617 Illumination with ultraviolet light; Luminescent elements or materials associated to the cell

Abstract

Disclosed are a color substrate, a manufacturing method thereof and a liquid crystal display. The color substrate comprises a substrate; black matrices disposed on the substrate; color pixels whose material is fluorescent material disposed alternately among the black matrices; a flat encapsulation layer covering the black matrices and the color pixel; and a built-in polarizer attached to the flat encapsulation layer. The manufacturing method comprises forming black matrices on a substrate, and forming color pixels of fluorescent material among the black matrices; form a flat encapsulation layer; and form a built-in polarizer. The liquid crystal display by using the color substrate of the present invention further comprises a array substrate, a liquid crystal layer and a back light wherein wavelength of light emitted by the back light is shorter than of equal to stimulated luminescence critical wavelength of fluorescent material of the color pixels on the color substrate. In the present invention, the color fluorescent material is used for replacing the color resin material on the color substrate, the lamination mode is changed and the energy loss resulting from light-absorbing of the resin material is decreased, which could increase the light utilization efficiency and improve the visual angle characteristic of the liquid crystal display.

Claims

1. A color substrate, comprising:

a substrate;

black matrices disposed on said substrate in the form of a matrix arrangement;

color pixels disposed alternately among said black matrices, wherein material of said color pixels comprises fluorescent material;

a flat encapsulation layer covering said black matrices and said color pixels; and

a polarizer attached to said flat encapsulation layer;

wherein said flat encapsulation layer comprises a film formed by overlapping organic polymer and inorganic material.

2. The color substrate according to claim 1, further comprising a transparent electric conducting layer attached to said polarizer.

3. The color substrate according to claim 1, wherein longitudinal cross-section of lines of said black matrices is a T shape, and bulgy edges of the T shape cross-sections of said black matrices cover edges of said adjacent color pixels.

4. A liquid crystal display by using a color substrate according to claim 1, comprising a array substrate disposed to face said color substrate, a liquid crystal layer disposed between said color substrate and said array substrate, and a back light disposed at one side of said array substrate departed from said color substrate, wherein wavelength of light emitted by said back light is shorter than or equal to stimulated luminescence critical wavelength of fluorescent material of the color pixels on said color substrate;

wherein said flat encapsulation layer comprises a film formed by overlapping organic polymer and inorganic material.

5. The liquid crystal display according to claim 4, wherein the color substrate further comprises a transparent electric conducting layer attached to said polarizer.

6. The liquid crystal display according to claim 4, wherein longitudinal cross-section of each line of said black matrices is a T shape, and bulgy edges of the T shape cross-sections of said black matrices cover edges of said adjacent color pixels.

7. The liquid crystal display according to claim 4, wherein the wavelength of light emitted by said back light is in a range of about 350 nm to about 480 nm;

and said back light is a cold cathode fluorescence lamp without coating the fluorescent material on its lamp tube wall or a light emitting diode.

8. The liquid crystal display according to claim 4, wherein said polarizer comprises metal grid or material of said polarizer comprises organic self-assembly material containing dye.

9. The color substrate according to claim 1, wherein said polarizer comprises metal grid or material of said polarizer comprises organic self-assembly material containing dye.

10. A manufacturing method of color substrate, comprising:

forming black matrices on a substrate in the form of a matrix arrangement, and forming color pixels of fluorescent material among said black matrices;

forming a flat encapsulation layer over the black matrices and the color pixels, wherein forming said flat encapsulation layer comprises;

orderly overlapping organic polymer and inorganic material on the above substrate by sputtering, chemical vapor deposition or thermal evaporation so as to form the flat encapsulation layer; and

forming a polarizer on said flat encapsulation layer.

11. The manufacturing method of color substrate according to claim 10, wherein after forming said polarizer, the method further comprises:

depositing transparent electric conducting material on said polarizer so as to form a transparent electric conducting layer.

12. The manufacturing method of color substrate according to claim 10, wherein forming black matrices on a substrate in the form of a matrix arrangement, and forming color pixels of fluorescent material among said black matrices comprises:

coating pasty inorganic fluorescent material on the substrate, and forming the color pixels in the form of a matrix arrangement by exposing and etching process;

forming the black matrices on said substrate, wherein said black matrices are alternately disposed among said color pixels.

13. The manufacturing method of color substrate according to claim 12, wherein forming said flat encapsulation layer comprises coating organic encapsulation material on the above substrate and forming the flat encapsulation layer by thermal curing process.

14. The manufacturing method of color substrate according to claim 10, wherein forming black matrices on a substrate in the form of a matrix arrangement, and forming color pixels of fluorescent material among said black matrices comprises:

forming the black matrices on the substrate in the form of the matrix arrangement;

forming the color pixels on the above substrate by mask vaporizing organic fluorescent material or ink-jet printing organic fluorescent material, wherein said color pixels are alternately disposed among said black matrices.

15. The manufacturing method of color substrate according to claim 10, wherein forming said polarizer comprises:

coating organic self-assembly material on said flat encapsulation layer, and curing and forming said organic self-assembly material by thermal curing or light-cured so as to form the polarizer.

16. The manufacturing method of color substrate according to claim 10, wherein forming said polarizer comprises:

depositing metal material on said flat encapsulation layer and forming the polarizer in the form of metal grid by disposing and etching process.

17. The manufacturing method of color substrate according to claim 10, wherein forming said polarizer comprises:

attaching an organic film with anisotropic refractive index on said flat encapsulation layer so as to form the polarizer.