Liquid crystal display and backlight module having light guide plate integrally formed with point illuminator

• US 20070097709A1
• Filed: 11/02/2006
• Published: 05/03/2007
• Est. Priority Date: 11/02/2005
• Status: Abandoned Application

• Current Assignee: InnoLux Corporation
• Original Assignee: Innolux Display Corporation (InnoLux Corporation)
• Inventors: Hsieh, Hsiang-Hui
• Application Number:
  US11/592,861
• Publication Number:
  US 20070097709A1
• Time in Patent Office: Days
• US Class Current: 362/620
• CPC Class Codes: G02B 6/0038 Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
• CPC Class Codes: G02B 6/0073 Light emitting diode [LED]
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133607 the light controlling member including light directing or refracting elements, e.g. prisms or lenses
• CPC Class Codes: G02F 2203/22 diffractive
• CPC Class Codes: H01L 33/54 having a particular shape

Abstract

An exemplary backlight module (11) includes a light guide plate (13), and at least one point illuminator (14). The light guide plate includes a main body (130). The main body includes a bottom surface (132), and a diffraction grating structure (136) at a top of the main body. The at least one point illuminator is integrally formed in contact with the light guide plate without intervening space or substance therebetween except at a bottom of the at least one point illuminator. The bottom of the at least one point illuminator corresponds in position to the bottom surface.

Claims

1. A backlight module comprising:

a light guide plate comprising;

a main body comprising;

a bottom surface; and

a plurality of prism structures at a top of the main body; and

at least one point illuminator formed in immediate contact with the light guide plate, a bottom of the at least one point illuminator being substantially coplanar with the bottom surface.

2. The backlight module in claim 1, wherein the at least one point illuminator is at least one light emitting diode.

3. The backlight module in claim 1, wherein the prism structures are annular.

4. The backlight module in claim 3, wherein the prism structures are concentric.

5. The backlight module in claim 4, wherein a density of distribution of the prism structures increases away from a center thereof.

6. The backlight module in claim 4, wherein a height of the prism structures increases away from a center thereof.

7. The backlight module in claim 5, wherein the prism structures form a fresnel diffraction grating structure.

8. The backlight module in claim 4, wherein the at least one point illuminator is positioned corresponding to a center of the prism structures.

9. The backlight module in claim 1, wherein the light guide plate and the at least one point illuminator are injection molded in immediate contact with each other.

10. The backlight module in claim 1, further comprising a flexible printed circuit board electrically connected with the at least one point illuminator.

11. The backlight module in claim 10, wherein the flexible printed circuit board abuts the bottom surface of the main body of the light guide plate.

12. A backlight module comprising:

a light guide plate comprising;

a main body comprising;

a bottom surface; and

a diffraction grating structure at a top of the main body; and

at least one point illuminator integrally formed in contact with the light guide plate without intervening space or substance therebetween except at a bottom of the at least one point illuminator, the bottom of the at least one point illuminator corresponding in position to the bottom surface.

13. The backlight module in claim 12, wherein the at least one point illuminator is at least one light emitting diode.

14. The backlight module in claim 12, wherein the diffraction grating structure is a fresnel diffraction grating structure.

15. The backlight module in claim 12, wherein the at least one point illuminator is positioned corresponding to a center of the diffraction grating structure.

16. The backlight module in claim 12, wherein the light guide plate and the at least one point illuminator are injection molded in immediate contact with each other.

17. A liquid crystal display comprising:

a liquid crystal panel; and

a backlight module positioned adjacent to an underside of the liquid crystal panel, the backlight module comprising;

a light guide plate comprising;

a main body comprising;

a bottom surface; and

a fresnel diffraction grating structure at a top of the main body; and

at least one point illuminator located at the position which is vertical aligned with a center of the fresnel diffraction grating structure.

18. The liquid crystal display as claimed in claim 17, wherein said at least one point illuminator is integrally formed in contact with the light guide plate without intervening space or substance therebetween except at a bottom of the at least one point illuminator, the bottom of the at least one point illuminator corresponding in position to the bottom surface.