BACKLIGHT UNIT AND DISPLAY APPARATUS HAVING THE SAME

• US 20080117359A1
• Filed: 11/20/2007
• Published: 05/22/2008
• Est. Priority Date: 11/20/2006
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Jung, Myung-ryul, Nho, Jeong-ho, Jeon, Wook-jae, Yoon, Seok-il, Lee, Dae-hee, Park, Yung-jun
• Application Number:
  US11/942,968
• Publication Number:
  US 20080117359A1
• Time in Patent Office: Days
• US Class Current: 349/64
• CPC Class Codes: G02F 1/133604 with lamps
• CPC Class Codes: G02F 1/133607 the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Abstract

A backlight unit, includes: a surface light source which emits a light; and a diffusion collimation member which is provided in a path of the light emitted by the surface light source, and comprises a first diffusion sheet having a plurality of first reflectors arranged in a first direction and a second diffusion sheet formed on the first diffusion sheet and having a plurality of second reflectors arranged in a second direction forming a predetermined angle with respect to the first direction of the first diffusion sheet.

Claims

1. A backlight unit, comprising:

a surface light source which emits a light; and

a diffusion collimation member which is provided in a path of the light emitted by the surface light source, and comprises a first diffusion sheet having a plurality of first reflectors arranged in a first direction and a second diffusion sheet formed on the first diffusion sheet and having a plurality of second reflectors arranged in a second direction forming a predetermined angle with respect to the first direction of the first diffusion sheet.

2. The backlight unit according to claim 1, wherein the first diffusion sheet further comprises a first main body, and the plurality of first reflectors has a trapezoid section, and is disposed in a surface of the first main body in the first direction.

3. The backlight unit according to claim 2, wherein the second diffusion sheet further comprises a second main body, and the plurality of second reflectors has a trapezoid section, and is disposed in a surface of the second main body in the second direction forming the predetermined angle with respect to the first direction.

4. The backlight unit according to claim 3, wherein the trapezoid section of the first reflectors is different from the trapezoid section of the second reflectors.

5. The backlight unit according to claim 1, wherein the first direction forms 90°

angle with respect to the second direction.

6. The backlight unit according to claim 1, wherein the first diffusion sheet and the second diffusion sheet comprise one of polymethyl methacrylate (PMMA), poly carbonate (PC), UV curing resin and polyethylene terephthalate (PET).

23. The backlight unit according to claim 1, wherein the surface light source comprises of portions for emitting light and portions for dividing the light emitting portions.

24. The backlight unit according to claim 23, wherein the dividing portions are arranged in a parallel manner.

25. The backlight unit according to claim 23, wherein the dividing portions are arranged in rectangular manner.

26. The backlight unit according to claim 1, wherein the backlight unit is used for a LCD type display.

7. A backlight unit, comprising:

a surface light source which emits a light; and

a diffusion collimation member which is provided in a path of the light emitted by the surface light source, and comprises a first diffusion sheet having a plurality of first reflectors arranged in a first direction and having a reflection surface to reflect light, and a second diffusion sheet formed on the first diffusion sheet and having a plurality of second reflectors arranged in a second direction forming a predetermined angle with respect to the first direction of the first diffusion sheet and having a reflection surface to reflect light; and

a coating layer which is formed in at least one of the reflection surface of the first reflectors and the reflection surface of the second reflectors.

8. The backlight unit according to claim 7, wherein the first diffusion sheet further comprises a first main body, and the plurality of first reflectors has a trapezoid section, and is disposed in a surface of the first main body in the first direction.

9. The backlight unit according to claim 8, wherein the second diffusion sheet further comprises a second main body, and the plurality of second reflectors has a trapezoid section, and is disposed in a surface of the second main body in the second direction forming the predetermined angle with respect to the first direction.

10. The backlight unit according to claim 9, wherein the coating layer is disposed in a pair of inclined sides which connect a lower side and an upper side of the trapezoid section of at least one of the first reflectors and the second reflectors.

11. The backlight unit according to claim 7, wherein the first direction forms 90°

angle with respect to the second direction.

27. The backlight unit according to claim 7, wherein the surface light source comprises of portions for emitting light and portions for dividing the light emitting portions.

28. The backlight unit according to claim 27, wherein the dividing portions are arranged in a parallel manner.

29. The backlight unit according to claim 27, wherein the dividing portions are arranged in rectangular manner.

30. The backlight unit according to claim 7, wherein the backlight unit is used for a LCD type display.

12. A display apparatus, comprising:

a liquid crystal display panel;

a surface light source which emits a light to the liquid crystal display panel; and

a diffusion collimation member which is provided in a path of the light from the surface light source to the liquid crystal display panel, and comprises a first diffusion sheet having a plurality of first reflectors arranged in a first direction, and a second diffusion sheet formed on the first diffusion sheet and having a plurality of second reflectors arranged in a second direction forming a predetermined angle with respect to the first direction of the first diffusion sheet.

13. The display apparatus according to claim 12, wherein the first diffusion sheet further comprises a first main body, and the plurality of first reflectors has a trapezoid section, and is disposed in a surface of the first main body toward the liquid crystal display panel in the first direction.

14. The display apparatus according to claim 13, wherein the second diffusion sheet further comprises a second main body, and the plurality of second reflectors has a trapezoid section, and is disposed in a surface of the second main body toward the liquid crystal display panel in the second direction forming the predetermined angle with respect to the first direction.

15. The display apparatus according to claim 14, wherein the trapezoid section of the first reflectors is different from the trapezoid section of the second reflectors.

16. The display apparatus according to claim 12, wherein the first direction forms 90°

angle with respect to the second direction.

17. The display apparatus according to claim 12, wherein the first diffusion sheet and the second diffusion sheet comprise one of polymethyl methacrylate (PMMA), poly carbonate (PC), UV curing resin and polyethylene terephthalate (PET).

31. The display apparatus according to claim 12, wherein the surface light source comprises of portions for emitting light and portions for dividing the light emitting portions.

32. The display apparatus according to claim 31, wherein the dividing portions are arranged in a parallel manner.

33. The display apparatus according to claim 31, wherein the dividing portions are arranged in rectangular manner.

34. The display apparatus according to claim 12, wherein the display apparatus is a LCD type display.

18. A display apparatus, comprising:

a liquid crystal display panel;

a surface light source which emits a light to the liquid crystal display panel; and

a diffusion collimation member which is provided in a path of the light from the surface light source to the liquid crystal display panel, and comprises a first diffusion sheet having a plurality of first reflectors arranged in a first direction and having a reflection surface to reflect light, and a second diffusion sheet formed on the first diffusion sheet and having a plurality of second reflectors arranged in a second direction forming a predetermined angle with respect to the first direction of the first diffusion sheet and having a reflection surface to reflect light; and

a coating layer which is formed in at least one of the reflection surface of the first reflectors and the reflection surface of the second reflectors.

19. The display apparatus according to claim 18, wherein the first diffusion sheet further comprises a first main body, and the plurality of first reflectors has a trapezoid section, and is disposed in a surface of the first main body toward the liquid crystal display panel in the first direction.

20. The display apparatus according to claim 19, wherein the second diffusion sheet further comprises a second main body, and the plurality of second reflectors has a trapezoid section, and is disposed in a surface of the second main body toward the liquid crystal display panel in the second direction forming the predetermined angle with respect to the first direction.

21. The display apparatus according to claim 20, wherein the coating layer is disposed in a pair of inclined sides which connect a lower side and an upper side of the trapezoid section of at least one of the first reflectors and the second reflectors.

22. The display apparatus according to claim 18, wherein the first direction forms 90°

angle with respect to the second direction.

35. The display apparatus according to claim 18, wherein the surface light source comprises of portions for emitting light and portions for dividing the light emitting portions.

36. The display apparatus according to claim 35, wherein the dividing portions are arranged in a parallel manner.

37. The display apparatus according to claim 35, wherein the dividing portions are arranged in rectangular manner.

38. The display apparatus according to claim 18, wherein the display apparatus is a LCD type display.