Backlight system and liquid crystal display employing the same

• US 20060133090A1
• Filed: 12/08/2005
• Published: 06/22/2006
• Est. Priority Date: 12/20/2004
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Noh, Ji-whan, Jeong, Jin-gil
• Application Number:
  US11/296,227
• Publication Number:
  US 20060133090A1
• Time in Patent Office: Days
• US Class Current: 362/294
• CPC Class Codes: F21V 29/51 using condensation or evaporation of a fluid, e.g. heat pipes
• CPC Class Codes: F21V 29/717 using split or remote units thermally interconnected, e.g. by thermally conductive bars or heat pipes
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133628 with cooling means

Abstract

A backlight system usable in a display positionable in an upright manner, and an LCD employing the backlight system. The backlight system includes a plurality of light emitting device arrangement lines, each line including a plurality of light emitting devices, and a plurality of heat pipes each mounted along one of the plurality of light emitting device arrangement lines, and the plurality of light emitting device arrangement lines and the corresponding mounted heat pipe form a predetermined angle with respect to a horizontal direction such that a movement of working fluid condensed in the heat pipe is accelerated by gravity.

Claims

1. A backlight system usable in a display positionable in an upright manner, the backlight system comprising:

a plurality of light emitting device arrangement lines, each line including a plurality of light emitting devices; and

a plurality of heat pipes each mounted along one of the plurality of light emitting device arrangement lines,

wherein each of the plurality of light emitting device arrangement lines and the corresponding mounted heat pipe form a predetermined angle with respect to a horizontal direction such that a movement of a working fluid condensed in the corresponding mounted heat pipe is accelerated by gravity.

2. The backlight system of claim 1, further comprising:

a base plate; and

a plurality of substrates on which the plurality of light emitting devices of one of the plurality of light emitting device arrangement lines are arranged in a line,

wherein the plurality of substrates mounted with the plurality of light emitting devices in the line are installed on the base plate to form the plurality of light emitting device arrangement lines.

3. The backlight system of claim 1, wherein the predetermined angle is one of a right angle with respect to the horizontal direction and an inclination angle with respect to the horizontal direction.

4. The backlight system of claim 1, further comprising:

a plurality of heat sinks each corresponding to one of the plurality of light emitting device arrangement lines and mounted at an end of the corresponding mounted heat pipe.

5. The backlight system of claim 4, further comprising:

a circuit part to drive the plurality of light emitting devices disposed adjacent to one side of the plurality of light emitting device arrangement lines,

wherein the plurality of heat sinks partially overlap the plurality of light emitting device arrangement lines except for an area where the circuit part is positioned.

6. The backlight system of claim 5, wherein each heat pipe overlaps an entire upper surface of the corresponding light emitting device arrangement line.

7. The backlight system of claim 4, wherein each heat pipe is disposed between a corresponding one of the plurality of light emitting device arrangement lines and the corresponding heat sink.

8. The backlight system of claim 4, further comprising:

a plurality of cooling fans each corresponding to one of the plurality of light emitting device arrangement lines.

9. The backlight system of claim 1, wherein each of the plurality of light emitting devices comprises:

a light emitting diode chip to emit light; and

a collimator to collimate the light emitted by the light emitting diode chip.

10. The backlight system of claim 9, wherein the collimator is one of a side emitter to direct incident light to propagate in a lateral direction and a dome-shaped collimator.

11. An LCD, comprising:

a liquid crystal panel; and

a backlight system to illuminate the liquid crystal panel, and positionable in a upright manner, the backlight system including;

a plurality of light emitting device arrangement lines, each line including a plurality of light emitting devices; and

a plurality of heat pipes each mounted along one of the plurality of light emitting device arrangement lines,

wherein each of the plurality of light emitting device arrangement lines and the corresponding mounted heat pipe form a predetermined angle with respect to a horizontal direction such that a movement of a working fluid condensed in the corresponding mounted heat pipe is accelerated by gravity.

12. The LCD of claim 11, further comprising:

a base plate; and

a plurality of substrates on which the plurality of light emitting devices of one of the plurality of light emitting device arrangement lines are arranged in a line,

wherein the plurality of substrates mounted with the plurality of light emitting devices in the line are installed on the base plate to form the plurality of light emitting device arrangement lines.

13. The LCD of claim 11, wherein the predetermined angle is one of a right angle with respect to the horizontal direction and an inclination angle with respect to the horizontal direction.

14. The LCD of claim 11, further comprising:

a plurality of heat sinks each corresponding to one of the plurality of light emitting device arrangement lines and mounted at an end of the corresponding mounted heat pipe.

15. The LCD of claim 14, further comprising:

a circuit part to drive the plurality of light emitting devices disposed adjacent to one side of the plurality of light emitting device arrangement lines,

wherein the plurality of heat sinks partially overlap the plurality of light emitting device arrangement lines except for an area where the circuit part is positioned.

16. The LCD of claim 15, wherein the plurality of heat pipe overlaps an area of the plurality of light emitting device arrangement lines.

17. The LCD of claim 14, wherein the heat pipe is disposed between the plurality of light emitting device arrangement lines and the corresponding heat sinks.

18. The LCD of claim 14, further comprising:

a plurality of cooling fans each corresponding to one of the plurality of light emitting device arrangement lines.

19. The LCD of claim 11, wherein each of the plurality of light emitting devices comprises:

a light emitting diode chip to emit light; and

a collimator to collimate the light emitted by the light emitting diode chip.

20. The LCD of claim 19, wherein the collimator is one of a side emitter to direct incident light to propagate in a lateral direction and a dome-shaped collimator.

21. A backlight system usable with a display, the backlight system comprising:

a plurality of light emitting devices disposed on a line; and

a heat pipe disposed along the line, containing a working fluid, having an evaporation part formed in a lengthwise direction of the line, and having a condensation part disposed in an upper end of the heat pipe.

22. The backlight system of claim 21, wherein the working fluid condensed in the condensing part descends to a lower end of the heat pipe by gravity.

23. A liquid crystal display, comprising:

a panel to display images according to an input image signal; and

a backlight unit to illuminate the panel, comprising;

a plurality of light emitting devices disposed on a line; and

a heat pipe disposed along the line, containing a working fluid, having an evaporation part formed in a lengthwise direction of the line, and having a condensation part disposed in an upper end of the heat pipe.

24. The liquid crystal display of claim 23, wherein the working fluid condensed in the condensation part descends to a lower end of the heat pipe by gravity.

25. The backlight system of claim 24, wherein the panel is disposed in a vertical direction corresponding to a direction of the gravity, and the lengthwise direction corresponds to the direction of the gravity.

26. The backlight system of claim 24, wherein the panel is disposed in a direction having a first angle with a direction of the gravity, and the lengthwise direction forms a second angle with the direction of the gravity.