Recessed LED lamp unit

• US 7,950,831 B2
• Filed: 04/28/2005
• Issued: 05/31/2011
• Est. Priority Date: 04/29/2004
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Moon, Jeong Min
• Primary Examiner(s): Sember; Thomas M
• Application Number:
  US11/116,177
• Publication Number:
  US 20050243577A1
• Time in Patent Office: 2,224 Days
• Field of Search: 362/612, 362/617, 362/800, 362/235, 362/238, 362/240, 362/244, 362/241, 362/243, 362/245, 362/246, 362/247, 362/615, 362/619, 362/623, 362/625, 362/311, 362/561, 362/97, 362 26- 30, 362/607, 362/610, 362/613, 362/327, 362/329, 362/308, 362/555, 362/223, 362/224, 362/337, 362/545, 362 971- 973, 362/328, 362/249.02, 257/98, 349/62
• US Class Current: 362/308
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 33/54 having a particular shape

Abstract

A light emitting diode (LED) lamp unit for obtaining a thin profile display device, to improve uniformity of light, and to simplify a power connection line for operation. The LED lamp unit includes an optical lens having a central recess part and an edge, wherein the central recess part is hollowed out inwardly, and the edge is formed in shape of a flat surface or in shape of a convex lens; at least one or more LED chips arranged at fixed intervals in a lower portion of the optical lens; and a lower reflecting sheet positioned on a bottom surface of the LED chip.

Claims

1. An LED lamp unit for a liquid crystal display device comprising:

one or more LED chips for emitting light;

an optical lens for transmitting and refracting light emitted from the one or more LED chips, the optical lens having a central recess part, the central recess part having a depth, length and width, wherein the length of the central recess part is greater than the width of the central recess part, wherein the optical lens has a length in the same direction as the length of the central recess part, width in the same direction as the width of the central recess part and height in the same direction as the height of the central recess part, wherein the length of the optical lens is greater than the width of the optical lens, wherein the width of the optical lens is greater than the height of the optical lens, wherein the depth of the central recess part is most of the height of the optical lens, wherein the central recess part is hollowed inwardly, and wherein the central recess part is surrounded by an elevated edge which is formed in a shape of a convex lens, wherein the elevated edge is positioned at a side direction of the central recess part,

wherein the one or more LED chips are arranged at fixed intervals in a lower portion of the optical lens; and

a lower reflecting sheet positioned on a bottom surface of the one or more LED chips,

wherein the light emitted from at least one LED chip is mostly progressing to the side direction by the optical lens.

2. The LED lamp unit of claim 1, wherein the central recess part has a V-shape.

3. The LED lamp unit of claim 1, wherein the central recess part of the optical lens has a flat surface or a curved surface.

4. The LED lamp unit of claim 1, further comprising an upper reflecting sheet on an upper surface of the optical lens.

5. The LED lamp unit of claim 1, further comprising a light-absorbing film or a light-scattering film on the upper surface of the optical lens.

6. The LED lamp unit of claim 5, wherein the light-absorbing film is a black sheet.

7. The LED lamp unit of claim 1, wherein each of the LED chips are connected with each of anode electrode terminals and each of cathode electrode terminals by lead, the anode electrode terminals of the LED chips are separately connected, and the cathode electrode terminals of the LED chips are separately connected.

8. The LED lamp unit of claim 1, wherein each of the LED chips are connected with each of anode electrode terminals and each of cathode electrode terminals by lead, the anode electrode terminals of the LED chips are separately connected, and the cathode electrode terminals of the LED chips are connected in common by a first electrode connection wire.

9. The LED lamp unit of claim 1, wherein each of the LED chips are connected with each of anode electrode terminals and each of cathode electrode terminals by lead, the anode electrode terminals of the LED chips are connected in common by a second electrode connection wire, and the cathode electrode terminals of the LED chips are separately connected.

10. The LED lamp unit of claim 1, wherein each of the LED chips are connected with each of anode electrode terminals and each of cathode electrode terminals by lead, the anode electrode terminals of the LED chips are connected in common by the second electrode connection wire, and the cathode electrode terminals of the LED chips are connected in common by the first electrode connection wire.

11. The LED lamp unit of claim 1, wherein the LED chips emit monochromatic light, tri-chromatic light of R, G and B, or white light.

12. The LED lamp unit of claim 1, wherein the edge has a flat surface.

13. The LED lamp unit of claim 1, wherein the depth of the central recess part is less than the width of the central recess part.

14. The LED lamp unit of claim 1, wherein the edge has a curved shape when viewed from the length and width directions.

15. The LED lamp unit of claim 1, wherein the LED chips are on the lower inner surface of the optical lens.

16. The LED lamp unit of claim 1, wherein an axis of curvature of the convex lens-shaped portions is perpendicular to the depth direction of the central recess part.

17. The LED lamp unit of claim 1, wherein the central recess part includes a valley running parallel to the length of the optical lens.

18. An LED lamp unit comprising:

a plurality of LED chips for emitting light;

an optical lens for transmitting and refracting light emitted from the plurality of LED chips, the optical lens having a recess part, the recess part having a depth, length and width, wherein the length of the recess part is greater than the width of the recess part, wherein the optical lens has a length in the same direction as the length of the recess part, width in the same direction as the width of the recess part and height in the same direction as the height of the recess part, wherein the length of the optical lens is greater than the width of the optical lens, wherein the width of the optical lens is greater than the height of the optical lens, wherein the depth of the recess part is most of the height of the optical lens, and wherein the recess part is surrounded by an elevated edge which is formed in a shape of a convex lens, wherein the elevated edge is positioned at a side direction of the central recess part,

wherein the plurality of LED chips are arranged at fixed intervals in a lower portion of the optical lens;

a lower reflecting sheet positioned on a bottom surface of the optical lens and the LED chips; and

an upper reflecting sheet positioned on an upper surface of the optical lens,

wherein the light emitted from at least one LED chip is mostly progressing to the side direction by the optical lens.

19. The LED lamp unit of claim 18, wherein the upper surface, on which the upper reflecting sheet is positioned, is a flat surface.

20. The LED lamp unit of claim 18, wherein each of the plurality of LED chips are connected with each of anode electrode terminals and each of cathode electrode terminals by lead, the anode electrode terminals of the plurality of LED chips are separately connected, and the cathode electrode terminals of the plurality of LED chips are separately connected.

21. The LED lamp unit of claim 18, wherein each of the plurality of LED chips are connected with each of anode electrode terminals and each of cathode electrode terminals by lead, the anode electrode terminals of the plurality of LED chips are separately connected, and the cathode electrode terminals of the plurality of LED chips are connected in common by a first electrode connection wire.

22. The LED lamp unit of claim 18, wherein each of the plurality of LED chips are connected with each of anode electrode terminals and each of cathode electrode terminals by lead, the anode electrode terminals of the plurality of LED chips are connected in common by a second electrode connection wire, and the cathode electrode terminals of the plurality of LED chips are separately connected.

23. The LED lamp unit of claim 18, wherein each of the plurality of LED chips are connected with each of anode electrode terminals and each of cathode electrode terminals by lead, the anode electrode terminals of the plurality of LED chips are connected in common by the second electrode connection wire, and the cathode electrode terminals of the plurality of LED chips are connected in common by the first electrode connection wire.

24. The LED lamp unit of claim 18, wherein the LED chips emit monochromatic light, tri-chromatic light of R, G and B, or white light.

25. The LED lamp unit of claim 18, wherein the upward-facing flat surface is substantially horizontal.

26. The LED lamp unit of claim 18, wherein the depth of the recess part is less than the width of the recess part.

27. The LED lamp unit of claim 18, wherein the edge has a curved shape when viewed from the length and width directions.

28. The LED lamp unit of claim 18, wherein the LED chips are on the lower inner surface of the optical lens.

29. The LED lamp unit of claim 18, wherein an axis of curvature of the convex lens-shaped portions is perpendicular to the depth direction of the recess part.

30. The LED lamp unit of claim 18, wherein the recess part includes a valley running parallel to the length of the optical lens.

31. An LED lamp unit comprising:

a plurality of LED chips for emitting light;

an optical lens for transmitting and refracting light emitted from the plurality of LED chips, the optical lens having a recess part, the recess part having a depth, length and width, wherein the length of the recess part is greater than the width of the recess part, wherein the optical lens has a length in the same direction as the length of the recess part, width in the same direction as the width of the recess part and height in the same direction as the height of the recess part, wherein the length of the optical lens is greater than the width of the optical lens, wherein the width of the optical lens is greater than the height of the optical lens, wherein the depth of the recess part is most of the height of the optical lens, and wherein the recess part is surrounded by an elevated edge which is formed in a shape of a convex lens, wherein the elevated edge is positioned at a side direction of the central recess part;

wherein the plurality of LED chips are arranged at fixed intervals in a lower portion of the optical lens;

a lower reflecting sheet positioned on a bottom surface of the optical lens and the LED chips; and

a light-absorbing film or a light-scattering film positioned on an upper surface of the optical lens,

wherein the light emitted from at least one LED chip is mostly progressing to the side direction by the optical lens.

32. The LED lamp unit of claim 31, wherein the light-absorbing film is a black sheet.

33. The LED lamp unit of claim 31, wherein the depth of the recess part is less than the width of the recess part.

34. The LED lamp unit of claim 31, wherein the edge has a curved shape when viewed from the length and width directions.

35. The LED lamp unit of claim 31, wherein the LED chips are on the lower inner surface of the optical lens.

36. The LED lamp unit of claim 31, wherein an axis of curvature of the convex lens-shaped portions is perpendicular to the depth direction of the recess part.

37. The LED lamp unit of claim 31, wherein the recess part includes a valley running parallel to the length of the optical lens.

38. An LED lamp unit, comprising:

one or more LED chips for emitting light;

an optical lens for transmitting and refracting light emitted from the one or more LED chips, the optical lens having a recess part, the recess part having a depth, length and width, wherein the length of the recess part is greater than the width of the recess part, wherein the optical lens has a length in the same direction as the length of the recess part, width in the same direction as the width of the recess part and height in the same direction as the height of the recess part, wherein the length of the optical lens is greater than the width of the optical lens, wherein the width of the optical lens is greater than the height of the optical lens, wherein the depth of the recess part is most of the height of the optical lens, wherein the recess part is surrounded by an elevated edge which is formed in a shape of a convex lens, wherein the elevated edge is positioned at a side direction of the central recess part;

wherein the one or more LED chips are arranged at fixed intervals in a lower portion of the optical lens; and

a lower reflecting sheet positioned on a bottom surface of the LED chips,

wherein the light emitted from at least one LED chip is mostly progressing to the side direction by the optical lens.

39. The LED lamp unit of claim 38, wherein an axis of curvature of the convex lens-shaped portions is perpendicular to the depth direction of the recess part.

40. The LED lamp unit of claim 38, wherein the recess part includes a valley running parallel to the length of the optical lens.

41. The LED lamp unit of claim 38, wherein the width of the recess part is most of the width of the optical lens.

42. The LED lamp unit of claim 38, wherein a width of the edge is less than the width of the recess part, the width of the edge being in the same direction as the width of the recess part.

43. The LED lamp unit of claim 38, wherein the edge having the shape of a convex lens extends downward to a bottom of the optical lens.

44. The LED lamp unit of claim 38, wherein a lengthwise end of the optical lens is curved, wherein an axis of curvature of the lengthwise end is parallel to the height direction of the optical lens.