Liquid crystal display device with light emitting diode package mounted on printed circuit board

• US 7,932,969 B2
• Filed: 10/31/2007
• Issued: 04/26/2011
• Est. Priority Date: 11/15/2006
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Hong, Won-Kee
• Primary Examiner(s): Caley; Michael H
• Application Number:
  US11/932,108
• Publication Number:
  US 20080111950A1
• Time in Patent Office: 1,273 Days
• Field of Search: 349/65, 349/69, 349/150, 362/612, 362/631
• US Class Current: 349/69
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02B 6/0083 Details of electrical connections of light sources to drivers, circuit boards, or the like
• CPC Class Codes: G02B 6/0085 Means for removing heat created by the light source from the package heat extraction or cooling elements for semiconductor light sources in general H01L33/64
• CPC Class Codes: G02F 1/13452 Conductors connecting driver circuitry and terminals of panels

Abstract

A liquid crystal display device using a light emitting diode includes a liquid crystal panel, a light guide plate including a light inlet part, the light guide plate being arranged at rear side of the liquid crystal panel, a flexible printed circuit film electrically connected to the liquid crystal panel, and a printed circuit board electrically connected to the flexible printed circuit film including a light emitting diode package mounted on a portion close to an end of the printed circuit board contacts the light inlet part of the light guide plate.

Claims

1. A liquid crystal display device comprising:

a liquid crystal panel;

a light guide plate including a light inlet part, the light guide plate being arranged at a rear side of the liquid crystal panel;

a bottom case receiving the light guide plate;

a flexible printed circuit film electrically connected to the liquid crystal panel;

a printed circuit board having a first surface and a second surface facing the first surface, the printed circuit board electrically connected to the flexible printed circuit film and including a light emitting diode package mounted on the first surface, and the light emitting diode package being proximate to an end of the printed circuit board; and

a heat radiating unit disposed on the second surface to radiate a heat generated by the light emitting diode package,

wherein the end of the printed circuit board faces the light inlet part, the printed circuit board includes at least one via hole through which the light emitting diode package and the heat radiating unit make contact with each other, and the heat radiating unit is connected to the bottom case to radiate the heat.

2. The liquid crystal display device of claim 1, wherein the flexible printed circuit film includes a driving circuit which drives the liquid crystal panel.

3. The liquid crystal display device of claim 2, wherein the printed circuit board includes a control integrated circuit which controls the driving circuit.

4. The liquid crystal display device of claim 3, wherein the light emitting diode package is arranged with a predetermined distance from the light inlet part, and the end of the printed circuit board makes contact with the light inlet part.

5. The liquid crystal display device of claim 4, wherein the control integrated circuit is mounted on the first surface.

6. The liquid crystal display device of claim 4, wherein the control integrated circuit is mounted on the second surface.

7. The liquid crystal display device of claim 1, wherein the heat radiating unit is made of a material including copper.

8. A liquid crystal display device comprising:

a liquid crystal panel;

a light guide plate including a light inlet part, the light guide plate being arranged at a rear side of the liquid crystal panel;

a bottom case receiving the light guide plate;

a flexible printed circuit film electrically connected to the liquid crystal panel;

a printed circuit board having a first surface and a second surface facing the first surface, the printed circuit board electrically connected to the flexible printed circuit film and having a control integrated circuit mounted thereto and a light emitting diode package mounted on the first surface, and the light emitting diode package being proximate to an end of the printed circuit board; and

a heat radiating unit disposed on the second surface to radiate a heat generated by the light emitting diode package,

wherein the printed circuit board is adjacent to the rear side, the end of the printed circuit board faces the light inlet part, the printed circuit board includes at least one via hole through which the light emitting diode package and the heat radiating unit make contact with each other, and the heat radiating unit is connected to the bottom case to radiate the heat.

9. The liquid crystal display device of claim 8, wherein the light emitting diode package is arranged with a predetermined distance from the light inlet part of the light guide plate, the end of the printed circuit board makes contact with the light inlet part.

10. The liquid crystal display device of claim 9, further comprising an optical sheet arranged between the liquid crystal panel and the light guide panel.

11. The liquid crystal display device of claim 9, wherein the light emitting diode package is interposed between the printed circuit board and the liquid crystal panel in a sectional view.

12. The liquid crystal display device of claim 11, wherein the heat radiating unit is interposed between the light emitting diode and the bottom case in a sectional view to radiate the heat.

13. The liquid crystal display device of claim 9, wherein the heat radiating unit is made of a material including copper.

14. The liquid crystal display device of claim 8, further comprising a driver circuit which is mounted on the liquid crystal panel, and the driver circuit is controlled by the control integrated circuit to drive the liquid crystal panel.

15. The liquid crystal display device of claim 14, wherein the control integrated circuit is mounted on the second surface.