Liquid crystal display and controlling method thereof

• US 20060208999A1
• Filed: 06/29/2005
• Published: 09/21/2006
• Est. Priority Date: 12/29/2004
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Lee, Tae Wook, Lee, Yong Kon
• Granted Patent: US 9,183,790 B2
• Time in Patent Office: Days
• US Class Current: 345/102
• CPC Class Codes: G09G 2320/0271 Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
• CPC Class Codes: G09G 2320/064 by time modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix

Abstract

A liquid crystal display device and a controlling method thereof are provided. The liquid crystal display device includes a liquid crystal display panel screen divided into a plurality of areas; a plurality of backlight sources to selectively irradiate light respectively to the divided areas of the screen; and a controller to obtain at least one intermediate brightness value associated with data for at least one of the divided areas and to control a brightness of at least one of the backlight sources corresponding to the at least one divided area according to the at least one intermediate brightness value.

Claims

1. A liquid crystal display device, comprising:

a liquid crystal display panel screen divided into a plurality of areas;

a plurality of backlight sources to selectively irradiate light respectively to the divided areas of the screen; and

a controller to obtain at least one intermediate brightness value associated with data for at least one of the divided areas and to control a brightness of at least one of the backlight sources corresponding to the at least one divided area according to the at least one intermediate brightness value.

2. The liquid crystal display device according to claim 1, wherein the controller controls the brightness of each of the backlight sources independently from each other.

3. The liquid crystal display device according to claim 1, wherein the controller generates at least one drive control signal corresponding to the at least one intermediate brightness value.

4. The liquid crystal display device according to claim 3, further comprising:

a plurality of light source drivers to selectively drive the backlight sources in response to the at least one drive control signal.

5. The liquid crystal display device according to claim 1, wherein the controller modulates the data based on the at least one intermediate brightness value.

6. The liquid crystal display device according to claim 1, wherein the controller includes:

a brightness/color difference separator to separate brightness and color difference components of the data; and

an area determiner to divide the brightness component obtained from the brightness/color difference separator to correspond with the divided areas.

7. The liquid crystal display device according to claim 6, wherein the controller further includes:

an intermediate value extractor to extract an intermediate value of the brightness component for each of the divided areas; and

a brightness modulator to modulate the brightness component of the data by using the extracted intermediate values.

8. The liquid crystal display device according to claim 7, wherein the intermediate value extractor includes a median filter.

9. A liquid crystal display device, comprising:

a liquid crystal display panel screen divided into a plurality of areas; and

a controller to obtain an intermediate brightness value associated with data for each of the divided areas and to modulate the data according to the obtained intermediate brightness values for displaying.

10. The liquid crystal display device according to claim 9, wherein the controller also controls a brightness of each of backlight sources independently from each other according to the obtained intermediate brightness values.

11. The liquid crystal display device according to claim 9, wherein the controller includes:

a brightness/color difference separator to separate brightness and color difference components of the data; and

an area determiner to divide the brightness component obtained from the brightness/color difference separator to correspond with the divided areas.

12. The liquid crystal display device according to claim 11, wherein the controller further includes:

an intermediate value extractor to extract an intermediate value of the brightness component for each of the divided areas; and

a brightness modulator to modulate the brightness component of the data by using the extracted intermediate values.

13. The liquid crystal display device according to claim 9, wherein the controller includes a media filter to extract the intermediate brightness values.

14. A method of controlling a liquid crystal display device, the liquid crystal display device including a liquid crystal display panel screen divided into a plurality of areas, and a plurality of backlight sources, the method comprising:

obtaining at least one intermediate brightness value associated with input data for at least one of the divided areas; and

controlling a brightness of at least one of the backlight sources corresponding to the at least one divided area according to the at least one intermediate brightness value.

15. The method according to claim 14, wherein in the controlling step, the brightness of each of the backlight sources is controlled independently from each other.

16. The method according to claim 14, further comprising:

modulating the data based on the at least one intermediate brightness value.

17. The method according to claim 14, wherein the controlling step includes:

separating brightness and color difference components of the data; and

dividing the brightness component to correspond with the divided areas.

18. The method according to claim 17, wherein the controlling step further includes:

extracting an intermediate value of the brightness component for each of the divided areas; and

modulating the brightness component of the data by using the extracted intermediate values.

19. The method according to claim 18, wherein the extracted intermediate values are median values.

20. A method of controlling a liquid crystal display device, the liquid crystal display device including a liquid crystal display panel screen divided into a plurality of areas, the method comprising:

obtaining an intermediate brightness value associated with data for each of the divided areas; and

modulating the data according to the obtained intermediate brightness values for displaying.

21. The method according to claim 20, further comprising:

controlling a brightness of each of backlight sources independently from each other according to the obtained intermediate brightness values.

22. The method according to claim 20, wherein the modulating step includes:

separating brightness and color difference components of the data; and

dividing the brightness component to correspond with the divided areas.

23. The method according to claim 22, wherein the modulating step further includes:

extract an intermediate value of the brightness component for each of the divided areas; and

modulating the brightness component of the data by using the extracted intermediate values.

24. The method according to claim 23, wherein the extracted intermediate values are median values.