Backlight module

• US 7,607,813 B1
• Filed: 10/30/2008
• Issued: 10/27/2009
• Est. Priority Date: 07/14/2008
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: Core-Flex Optical (Suzhou) Co., Ltd. (Coretronic Corporation)
• Inventors: Ting, Ching-Hua, Luh, Lung-Shiang
• Primary Examiner(s): Husar, Stephen F
• Application Number:
  US12/261,440
• Time in Patent Office: 362 Days
• Field of Search: 349/64, 349/65, 359/599, 362/330, 362/606, 362/607, 362617-620
• US Class Current: 362/607
• CPC Class Codes: G02B 6/0051 Diffusing sheet or layer
• CPC Class Codes: G02B 6/0053 Prismatic sheet or layer; Brightness enhancement element, sheet or layer
• CPC Class Codes: G02F 1/133507 Films for enhancing the luminance
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members
• CPC Class Codes: G02F 1/133607 the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Abstract

A backlight module includes a light source and an integrated optical film. The integrated optical film includes a base, a brightness enhancement layer and a diffusion layer. The base has a first surface and a second surface opposite to each other. The brightness enhancement layer has a plurality of brightness enhancement columns and a plurality of diffusion particles. The brightness enhancement columns are disposed on the first surface. The diffusion particles are dispersed in the brightness enhancement columns. The diffusion layer has a plurality of granular patterns disposed on the second surface in an irregular arrangement. Light beams emitted from the light source pass through the diffusion layer, the base and the brightness enhancement layer in proper order.

Claims

1. A backlight module comprising:

a light source;

a diffusion plate disposed on the light source, wherein the diffusion plate has a light incident surface and a light emitting surface opposite to the light incident surface, and the light incident surface faces the light source; and

an integrated optical film disposed on the diffusion plate and comprising;

a base having a first surface and a second surface opposite to each other, wherein the second surface faces the light emitting surface of the diffusion plate;

a brightness enhancement layer having a plurality of brightness enhancement columns and a plurality of diffusion particles, wherein the brightness enhancement columns are disposed on the first surface and the diffusion particles are dispersed in the brightness enhancement columns; and

a diffusion layer having a plurality of granular patterns disposed on the second surface in an irregular arrangement.

2. The backlight module as claimed in claim 1, wherein the thickness of the base is in the range from 250 to 350 micrometers.

3. The backlight module as claimed in claim 1, wherein the thickness of the brightness enhancement layer is less than 40 micrometers.

4. The backlight module as claimed in claim 1, wherein the thickness of the diffusion layer is less than 5 micrometers.

5. The backlight module as claimed in claim 1, wherein each of the brightness enhancement columns comprises a prism or a cambered column.

6. The backlight module as claimed in claim 1, wherein the granular patterns comprise a plurality of granular protrusions, a plurality of granular dents or a combination thereof.

7. The backlight module as claimed in claim 1, wherein each of the diffusion particles comprises polymethylmethacrylate, polycarbonate, polystyrene or silicon dioxide.

8. The backlight module as claimed in claim 1, wherein the base comprises polyethylene terephthalate.

9. The backlight module as claimed in claim 1, wherein each of the brightness enhancement columns comprises acrylic resin.

10. The backlight module as claimed in claim 1, wherein the diffusion layer comprises acrylic resin.

11. A backlight module comprising:

a light guiding plate having a light incident surface, a bottom surface and a light emitting surface, wherein the light incident surface connects the bottom surface and the light emitting surface, and the bottom surface and the light emitting surface are opposite to each other;

a light source disposed adjacent to the light incident surface;

a diffusion film disposed on the light emitting surface; and

an integrated optical film disposed on the diffusion film and comprising;

a base having a first surface and a second surface opposite to each other, wherein the second surface faces the diffusion film and the light guiding plate;

a brightness enhancement layer having a plurality of brightness enhancement columns and a plurality of diffusion particles, wherein the brightness enhancement columns are disposed on the first surface and the diffusion particles are dispersed in the brightness enhancement columns; and

a diffusion layer having a plurality of granular patterns disposed on the second surface in an irregular arrangement.

12. The backlight module as claimed in claim 11, wherein the thickness of the base is in the range from 250 to 350 micrometers.

13. The backlight module as claimed in claim 11, wherein the thickness of the brightness enhancement layer is less than 40 micrometers.

14. The backlight module as claimed in claim 11, wherein the thickness of the diffusion layer is less than 5 micrometers.

15. The backlight module as claimed in claim 11, wherein each of the brightness enhancement columns comprises a prism or a cambered column.

16. The backlight module as claimed in claim 11, wherein the granular patterns comprise a plurality of granular protrusions, a plurality of granular dents or a combination thereof.