Liquid crystal display comprising at least one LED and a PCB and a frame having an opening with a narrow portion and a broad portion on a side surface of the frame and backlight module having the same

• US 7,671,936 B2
• Filed: 09/21/2006
• Issued: 03/02/2010
• Est. Priority Date: 09/21/2006
• Status: Active Grant

• Current Assignee: HannStar Display Corporation
• Original Assignee: HannStar Display Corporation
• Inventors: Chang, Chih-Li
• Primary Examiner(s): Schechter; Andrew
• Assistant Examiner(s): CHANG, CHARLES S
• Application Number:
  US11/533,774
• Publication Number:
  US 20080074580A1
• Time in Patent Office: 1,258 Days
• Field of Search: 349/65, 349 58- 62, 362 972- 973, 362612-613, 362632-633
• US Class Current: 349/65
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02B 6/0073 Light emitting diode [LED]
• CPC Class Codes: G02B 6/009 of the light source in the package G02B6/0021 takes precedence
• CPC Class Codes: G02F 1/133608 including particular frames or supporting means
• CPC Class Codes: G02F 1/133615 Edge-illuminating devices, i.e. illuminating from the side

Abstract

A liquid crystal display has a light guide plate, a liquid crystal panel disposed on the light guide plate, a frame having a compartment for containing the light guide plate and a frame wall having an opening and a light bar cavity, and a light bar buried in the light bar cavity via the opening.

Claims

1. A liquid crystal display, comprising:

a light guide plate having a light introducing surface;

a frame having a compartment for containing the light guide plate, an opening with a narrow portion and a broad portion simultaneously disposed on a side surface of the frame, and a light bar cavity;

a liquid crystal panel disposed above the frame; and

a light bar having at least one light emitting diode (LED) and a print circuit board (PCB) buried in the light bar cavity via the opening;

wherein the side surface of the frame is substantially parallel to the light introducing surface, and a light emitting surface of the LED is substantially parallel to the light introducing surface.

2. The liquid crystal display of claim 1, wherein the light bar comprises a substrate and a light source positioned on a surface of the substrate.

3. The liquid crystal display of claim 2, wherein the surface faces the light guide plate.

4. The liquid crystal display of claim 2, wherein the substrate is a printed circuit board.

5. The liquid crystal display of claim 2, wherein the substrate comprises a conductive pad.

6. The liquid crystal display of claim 2, wherein the substrate has a hole.

7. The liquid crystal display of claim 2, wherein the light source is a light emitting diode.

8. The liquid crystal display of claim 7, wherein the light emitting diode is a side-view light emitting diode, a top-view light emitting diode, or a white light emitting diode.

9. The liquid crystal display of claim 1, wherein a height of the narrow portion is equal to or larger than a thickness of the substrate.

10. The liquid crystal display of claim 1, wherein a height of the broad portion is equal to or larger than a thickness of the substrate and the light source.

11. The liquid crystal display of claim 1, wherein a width of the broad portions is equal to or larger than the width of light source.

12. The liquid crystal display of claim 2, wherein the divergence angle of the light source is ±

80 degrees.

13. The liquid crystal display of claim 12, wherein the divergence angle of the light source is ±

60 degrees.

14. The liquid crystal display of claim 1, wherein a height of the opening is equal to or larger than the thickness of the light bar.

15. The liquid crystal display of claim 1, wherein the frame is composed of materials with high reflectivity material or white material.

16. The liquid crystal display of claim 1, wherein the frame is composed of light absorbed material or black material.

17. The liquid crystal display of claim 1, further comprises a screw securing the light bar.

18. The liquid crystal display of claim 1, further comprises a tape securing the light bar.

19. The liquid crystal display of claim 1, wherein the frame comprises a fixing strip supporting the light guide plate.

20. The liquid crystal display of claim 1, wherein the frame further comprises a plurality of narrow portions, and the narrow portions and the broad portion are alternately arranged on the side surface of the frame.

21. A backlight module, comprising:

a light guide plate having a light introducing surface;

a frame having a compartment for containing the light guide plate, an opening with a narrow portion and a broad portion simultaneously disposed on a side surface of the frame, and a light bar cavity; and

a light bar having at least one light emitting diode (LED) and a print circuit board (PCB) buried in the light bar cavity via the opening,

wherein the side surface of the frame is substantially parallel to the light introducing surface, and a light emitting surface of the LED is substantially parallel to the light introducing surface.

22. The back light module of claim 21, wherein the frame further comprises a plurality of narrow portions, and the narrow portions and the broad portion are alternately arranged on the side surface of the frame.