Backlight assembly and liquid crystal display module using the same

• US 7,530,711 B2
• Filed: 08/25/2006
• Issued: 05/12/2009
• Est. Priority Date: 12/28/2005
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Bang, Ju-Young
• Primary Examiner(s): O'Shea; Sandra L.
• Assistant Examiner(s): Dunwiddie; Meghan K.
• Application Number:
  US11/509,650
• Publication Number:
  US 20070070625A1
• Time in Patent Office: 991 Days
• Field of Search: 362/612, 362/623, 362632-634, 362/227, 362/235, 362/240, 362/241, 362/247, 362/800, 313/2.1, 345/82, 345/83
• US Class Current: 362/241
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133605 including specially adapted reflectors
• CPC Class Codes: G02F 1/133609 including means for improving the color mixing, e.g. white
• CPC Class Codes: G02F 1/133611 including means for improving the brightness uniformity
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A backlight assembly includes light emitting diodes in patterns, a reflective sheet having a plurality of through holes through which the light emitting diodes protrude, and a sidewall dividing the patterns into a plurality of light emitting diode units.

Claims

1. A backlight assembly, comprising:

light emitting diodes in patterns;

a reflective sheet having a plurality of through holes through which the light emitting diodes protrude; and

a sidewall dividing the patterns into a plurality of light emitting diode units each including at least three light emitting diodes which emit red, green and blue colored lights respectively, wherein the sidewall is disposed between the plurality of light emitting diode units to surround each of the divided light emitting diode units, and the sidewall includes an opaque reflective material,

wherein the sidewall is disposed on the reflective sheet, and wherein each of the through holes corresponds to each of the light emitting diodes.

2. The backlight assembly according to claim 1, wherein the sidewall has a cross-sectional shape in which a width of the sidewall gradually decreases from the reflective sheet.

3. The backlight assembly according to claim 2, wherein the cross-sectional shape is one of a triangle and a trapezoid.

4. A backlight assembly, comprising:

light emitting diodes emitting at least three colors and positioned in light emitting diode units;

a reflective sheet having a plurality of holes, the light emitting diodes protruding through the holes; and

a sidewall disposed between the light emitting diode units and bounding each of the light emitting diode units, wherein the sidewall includes an opaque reflective materials,

wherein the sidewall is disposed on the reflective sheet, and wherein each of the through holes corresponds to each of the light emitting diodes.

5. The backlight assembly according to claim 4, wherein the sidewall has a cross-sectional shape in which a width of the sidewall gradually decreases from the reflective sheet.

6. The backlight assembly according to claim 5, wherein the cross-sectional shape is one of a triangle and a trapezoid.

7. The backlight assembly according to claim 4, wherein the sidewall has a lattice shape.

8. The backlight assembly according to claim 6, wherein each of the light emitting diode units include at least one red light emitting diode, at least one green light emitting diode and at least one blue light emitting diode.

9. The backlight assembly according to claim 4, wherein each of the light emitting diode units include a white light emitting diode.

10. The backlight assembly according to claim 4, further comprising:

at least one printed circuit board where the light emitting diodes are mounted; and

an optical sheet disposed over the light emitting diodes.

11. The backlight assembly according to claim 10, further comprising:

a transparent window interposed between the light, emitting diodes and the optical sheet; and

diverters under the transparent window and facing the light emitting diodes so as to correspond to each of the light emitting diodes.

12. The backlight assembly according to claim 4, wherein each of the light emitting diode units includes one of a straight shape, a triangular shape, a square shape, and a shape such that four light emitting diodes are disposed at four vertexes of the shape and one light emitting diode is disposed at a central position of the shape.

13. The backlight assembly according to claim 4, wherein the light emitting diodes are driven by a division driving method.

14. The backlight assembly according to claim 4, wherein the light emitting diodes are side emitting type light emitting diodes.

15. A liquid crystal display module, comprising:

a backlight assembly having light emitting diodes three emitting at least three colors and positioned in light emitting diode units, a reflective sheet having a plurality of holes, the light emitting diodes protruding through the plurality of holes, and a sidewall that bounds each of the light emitting diode units;

a bottom frame on which the backlight assembly is disposed;

a liquid crystal panel disposed over the backlight assembly;

a main frame surrounding the liquid crystal panel and the backlight assembly; and

a top frame surrounding a front edge of the liquid crystal panel,

wherein the sidewall is disposed on the reflective sheet, and wherein each of the holes corresponds to each of the light emitting diodes.