Backlight unit for liquid crystal display

• US 20070247833A1
• Filed: 04/18/2007
• Published: 10/25/2007
• Est. Priority Date: 04/19/2006
• Status: Abandoned Application

• Current Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Lee, Sang Yun, Yoo, Chul Hee, Kim, Hyung Suk, Hahm, Hun Joo, Kwon, Jae Wook, Yun, Hyeong Won, Lee, Hyun Ho, Yang, Yoon Tak, Park, Myoung Bo
• Application Number:
  US11/785,449
• Publication Number:
  US 20070247833A1
• Time in Patent Office: Days
• US Class Current: 362/97.100
• CPC Class Codes: G02F 1/133605 including specially adapted reflectors
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members

Abstract

A backlight unit suitable for realizing a high-quality image. The backlight unit according to the present invention is a direct type, which is disposed under a liquid crystal panel to irradiate light to a back surface of the liquid crystal panel. The backlight unit includes a light source unit having a plurality of light source regions formed on a substrate, each of the light source regions driven separately and having at least one light emitting diode. The backlight unit also includes partitions provided on the substrate and disposed between the light source regions of the light source unit, and a circuit for controlling and driving the light source unit.

Claims

1. A direct type backlight unit used to irradiate light to a back surface of a liquid crystal panel of a liquid crystal display, comprising:

a light source unit having a plurality of light source regions formed on a substrate, each of the light source regions driven separately and having at least one light emitting diode;

partitions provided on the substrate and disposed between the light source regions of the light source unit; and

a circuit for controlling and driving the light source unit.

2. The backlight unit according to claim 1, wherein the light emitting diode in each of the light source regions of the light source unit comprises at least one of each of red, green and blue light emitting diodes.

3. The backlight unit according to claim 1, wherein each of the light source regions of the light source unit comprises at least one white light emitting diode.

4. The backlight unit according to claim 1, wherein the liquid crystal panel has a plurality of divided regions, and wherein each of the light source regions of the light source unit irradiates light to corresponding one of the divided regions of the liquid crystal panel.

5. The backlight unit according to claim 4, wherein the luminance of the light source unit is controlled by adjusting the luminance of each of the light source regions according to a gray level peak value of each of the divided regions of the liquid crystal panel.

6. The backlight unit according to claim 5, wherein the circuit comprises a controller and a light emitting diode driver, wherein the controller controls the operation of the light emitting diode driver in accordance with the gray level peak value of each of the divided regions of the liquid crystal panel, and the light emitting diode driver drives the light source unit in accordance with control by the controller such that at least one of the light source regions have different luminance from other ones of the light source regions.

7. The backlight unit according to claim 1, wherein the light source regions extend in a horizontal direction, and lighted sequentially by being synchronized in time with the liquid crystal panel.

8. The backlight unit according to claim 1, wherein the partitions extend in a horizontal or vertical direction on the substrate.

9. The backlight unit according to claim 1, wherein the partitions are arranged in a matrix on the substrate.

10. The backlight unit according to claim 1, wherein the partitions have a height of 5 to 25 mm.