BACKLIGHT APPARATUS AND A LIQUID CRYSTAL DISPLAY INCLUDING THE SAME

• US 20100045710A1
• Filed: 08/21/2009
• Published: 02/25/2010
• Est. Priority Date: 08/22/2008
• Status: Abandoned Application

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: CHOI, Ho-Sup, KWON, Kyu-Min, KIM, Sang-Youn, PARK, Byoung-Haw
• Application Number:
  US12/545,197
• Publication Number:
  US 20100045710A1
• Time in Patent Office: Days
• US Class Current: 345/690
• CPC Class Codes: G09G 2310/024 Scrolling of light from the illumination source over the display in combination with the scanning of the display screen
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/064 by time modulation of the brightness of the illumination source
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix
• CPC Class Codes: G09G 3/36 using liquid crystals

Abstract

A liquid crystal display includes a liquid crystal panel, a backlight unit, and a backlight control circuit. The liquid crystal panel displays an image. The backlight unit supplies light to the liquid crystal panel and includes a plurality of backlight blocks arranged in a matrix. The backlight control circuit controls the backlight unit. When the backlight control circuit turns on at least one of the backlight blocks, it turns off any remaining backlight blocks arranged in a same row of the backlight unit.

Claims

1. A liquid crystal display, comprising:

a liquid crystal panel that displays an image;

a backlight unit that supplies light to the liquid crystal panel,

wherein the backlight unit comprises a plurality of backlight blocks arranged in a matrix; and

a backlight control circuit that controls the backlight unit,

wherein the backlight control circuit turns on at least one of the backlight blocks and turns off any remaining backlight blocks arranged in a same row of the backlight unit.

2. The liquid crystal display of claim 1, wherein the backlight blocks arranged in the same row of the backlight unit are alternately turned on and off in a row direction.

3. The liquid crystal display of claim 1, wherein the backlight blocks arranged in a same column of the backlight unit are alternately turned on and off in a column direction.

4. The liquid crystal display of claim 1, wherein a pulse width modulation signal is applied to the backlight blocks of the backlight unit to adjust a brightness of the image.

5. The liquid crystal display of claim 1, wherein each of the backlight blocks comprises a plurality of light emitting diodes.

6. The liquid crystal display of claim 1, wherein the backlight control circuit individually controls the backlight blocks.

7. The liquid crystal display of claim 1, wherein the liquid crystal panel scans an image signal in a column direction in a row.

8. The liquid crystal display of claim 7, wherein the backlight blocks arranged in first and second rows of the backlight unit are alternately turned on and off in row and column directions when the image signal is scanned in a first row of the liquid crystal panel.

9. The liquid crystal display of claim 8, wherein the backlight blocks arranged in the first and second rows of the backlight unit are turned on when the image signal is scanned in a second row of the liquid crystal panel.

10. The liquid crystal display of claim 8, wherein the backlight control circuit applies a pulse width modulation signal corresponding to brightness information of the image signal scanned in the first row and a second row of the liquid crystal panel to the backlight blocks provided in the first and second rows of the backlight unit when the image signal is scanned in the first row of the liquid crystal panel.

11. The liquid crystal display of claim 7, wherein the backlight blocks arranged in third and fourth rows of the backlight unit are alternately turned on and off in row and column directions when the image signal is scanned in a third row of the liquid crystal panel.

12. The liquid crystal display of claim 7, wherein the backlight blocks of the backlight unit are alternately turned on and off in row and column directions when the image signal is scanned in a first row of the liquid crystal panel.

13. The liquid crystal display of claim 12, wherein an on-off state of the backlight blocks of the backlight unit is inverted when the image signal is scanned in a second row of the liquid crystal panel as compared to when the image signal is scanned in the first row of the liquid crystal panel.

14. The liquid crystal display of claim 13, wherein the on-off state of the backlight blocks of the backlight unit is inverted when the image signal is scanned in a third row of the liquid crystal panel as compared to when the image signal is scanned in the second row of the liquid crystal panel.

15. The liquid crystal display of claim 12, wherein the backlight control circuit applies a pulse width modulation signal corresponding to brightness information of the image signal scanned in the first row of the liquid crystal panel to the backlight blocks of the backlight unit when the image signal is scanned in the first row of the liquid crystal panel.

16. The liquid crystal display of claim 1, wherein the backlight unit comprises a plurality of printed circuit boards arranged in a column direction, and the backlight blocks are formed on the printed circuit boards.

17. The liquid crystal display of claim 16, wherein the backlight control circuit comprises a plurality of controllers to control the printed circuit boards, respectively.

18. A backlight apparatus, comprising:

a backlight unit that comprises a plurality of backlight blocks arranged in a matrix; and

a backlight control circuit that controls the backlight unit,

wherein the backlight control circuit turns on at least one of the backlight blocks and turns off any remaining backlight blocks arranged in a same row of the backlight unit.

19. The backlight apparatus of claim 18, wherein the backlight blocks are alternately turned on and off in row and column directions.

20. The backlight apparatus of claim 18, wherein a pulse width modulation signal is applied to the backlight blocks to adjust a brightness of the backlight unit.