Display device

• US 20070064444A1
• Filed: 09/05/2006
• Published: 03/22/2007
• Est. Priority Date: 09/16/2005
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Su-gun, Kim, Jung-hyeon, Lee, Jun-young, Park, Joon-chan, Park, Jae-hyun, Lee, Kye-hoon
• Application Number:
  US11/514,879
• Publication Number:
  US 20070064444A1
• Time in Patent Office: Days
• US Class Current: 362/612
• CPC Class Codes: G02B 6/0031 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources

Abstract

A liquid crystal display device comprising an LCD panel, a light guiding plate disposed in back of the LCD panel and a plurality of LEDs disposed on a plane in parallel with the LCD panel along a lateral side of the light guiding plate and arranged in two rows or more is provided. With this configuration, color mixing efficiency is enhanced while size of the display device is kept to a minimum.

Claims

1. A liquid crystal display (LCD) device, comprising:

an LCD panel;

a light guiding plate disposed in back of the LCD panel; and

a plurality of light emitting diodes (LEDs) disposed on a plane substantially parallel with a surface of the LCD panel along a side of the light guiding plate and arranged in two or more rows.

2. The liquid crystal display device according to claim 1, wherein the two or more rows are arranged according to a color of light emitted by the LEDs in each row.

3. The liquid crystal display device according to claim 1, further comprising an LED circuit board wherein the plurality of LEDs are mounted on the LED circuit board and disposed in parallel with the LCD panel.

4. The liquid crystal display device according to claim 3, further comprising:

a casing accommodating the light guiding plate and the LED circuit board; and

a radiating member provided on the outside of the casing corresponding to the LED circuit board.

5. The liquid crystal display device according to claim 4, wherein the radiating member comprises a radiating fin.

6. The liquid crystal display device according to claim 1, further comprising at least one cover at least partially covering the plurality of LEDs and reflecting light from the plurality of LEDs to an incident surface of the light guiding plate.

7. The liquid crystal display device according to claim 6, wherein the at least one cover comprises at least one dichroic reflector.

8. The liquid crystal display device according to claim 7, wherein the at least one dichroic reflector comprises three dichroic reflectors and wherein each dichroic reflector reflects a different color of light.

9. The liquid crystal display device according to claim 8, wherein at least one of the three dichroic reflectors is disposed between the LEDs.

10. The liquid crystal display device according to claim 9, wherein LEDs emitting light of a color corresponding to the color of light reflected from one of the dichroic reflectors are disposed between the one of the dichroic reflectors and the light guiding plate.

11. The liquid crystal display device according to claim 6, wherein the at least one cover reflects light from each of the two or more rows of LEDs along unequal optical paths to the incident surface of the light guiding plate.

12. The liquid crystal display device according to claim 11, wherein the at least one cover extends from a side of one of the two or more rows of LEDs toward a light exit surface of the light guiding plate.

13. The liquid crystal display device according to claim 1, wherein the light guiding plate has a rectangular shape, and the two or more rows are arranged along a short side of the light guiding plate.

14. The liquid crystal display device according to claim 1, wherein the light guiding plate has a rectangular shape, and the two or more rows are arranged along a long side of the light guiding plate.

15. A display device comprising:

a display panel;

a light guide; and

a plurality of light emitting diodes (LEDs) disposed on a plane parallel with the display panel along a side of the light guide and arranged as a plurality of rows.

16. The display device according to claim 15, wherein the display panel comprises a liquid crystal display (LCD) panel.

17. The display device according to claim 15, wherein the display panel comprises a digital micromirror device (DMD) panel.

18. The display device according to claim 16, wherein the light guide comprises a plate.

19. The display device according to claim 18, further comprising at least one reflector for reflecting light emitted by the plurality of LEDs.

20. The display device according to claim 19, wherein the at least one reflector comprises a plurality of reflectors.

21. The display device according to claim 20, wherein the number of reflectors corresponds to the number of different colors emitted by the LEDs.

22. The display device according to claim 21, wherein the plurality of reflectors comprise dichroic reflectors.

23. The display device according to claim 18, wherein each of the plurality of rows of LEDs emits a color of light different from the remaining rows.

24. The display device according to claim 23, wherein the LEDs within a same row emit the same color of light.

25. The display device according to claim 23, wherein the LEDs within a same row emit different colors of light.

26. The display device according to claim 23, further comprising at least one reflector for reflecting the light emitted by the plurality of LEDs.

27. The display device according to claim 26, wherein the at least one reflector comprises a plurality of reflectors.

28. The display device according to claim 27, wherein the number of reflectors corresponds to the number of different colors emitted by the LEDs.

29. The display device according to claim 28, wherein each of the plurality of reflectors reflects light from the two or more rows of LEDs along unequal optical paths to an incident surface of the light guiding plate.

30. The display device according to claim 27, wherein the plurality of reflectors comprise dichroic reflectors.

31. The display device according to claim 30, wherein at least one of the dichroic reflectors is disposed between the different rows of the LEDs.

32. The display device according to claim 31, wherein each of the dichroic reflectors reflects only the corresponding color and transmits other colors.

33. The display device according the claim 30, wherein each of the plurality of reflectors is disposed such that each of the plurality of reflectors receives a plurality of colors of light emitted by the LEDs which emit different colors of light.

34. The display device according to the claim 33, wherein each of the dichroic reflectors reflects only the corresponding color and transmits other colors.

35. The display device according to claim 34, wherein each of the plurality of reflectors reflects light from the two or more rows of LEDs along unequal optical paths to an incident surface of the light guiding plate.

36. The display device according to the claim 34, wherein the LEDs within a same row emit the same colors of light.

37. The display device according to the claim 34, wherein the LEDs within a same row emit different colors of light.

38. The display device according to the claim 37, wherein the rows of LEDs are mounted on an LED circuit board.

39. The display device according to claim 38, wherein the LED circuit board comprises of a core which is made of aluminum.

40. The display device according to claim 39, wherein the light guiding plate is made of polyethylene terephthalate.

41. The display device according to claim 39, further comprising a radiating fin for transmitting heat generated by the LEDs.