DRIVING APPARATUS FOR DISPLAYER AND METHEOD THEREOF

• US 20080297461A1
• Filed: 08/07/2007
• Published: 12/04/2008
• Est. Priority Date: 05/31/2007
• Status: Abandoned Application

• Current Assignee: Chunghwa Picture Tubes Limited (Tatung Co., Ltd.)
• Original Assignee: Chunghwa Picture Tubes Limited (Tatung Co., Ltd.)
• Inventors: Cheng, Jung-Chieh, Chen, Szu-Fen, Hsu, Tien-Chu, Hsu, Ming-Tan
• Application Number:
  US11/834,698
• Publication Number:
  US 20080297461A1
• Time in Patent Office: Days
• US Class Current: 345/102
• 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 2310/061 for resetting or blanking
• CPC Class Codes: G09G 2320/064 by time modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2320/066 for control of contrast
• 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 3/342 using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines

Abstract

A driving apparatus for a displayer and a method thereof are provided. The driving apparatus includes an image processing unit, a timing controller, and a backlight controller. The image processing unit divides a frame period into an image period and a dark state period. During the dark state period, black (or gray) insertion is performed to an image with a black (or gray) frame through a scan backlight technique. During the image period, the image data is displayed through a dynamic backlight technique. Thereby, the contrast of the displayer is improved and the power consumption thereof is reduced.

Claims

1. A driving apparatus, for driving a displayer to display an image data, the image data comprising at least one frame period, the driving apparatus comprising:

.

an image processing unit, for analyzing and adjusting the image data, and the image processing unit dividing the frame period into an image period and a dark state period;

a timing controller, outputting a gray scale image data during the dark state period; and

a backlight controller, sequentially adjusting the brightness of a plurality of backlight sources according to the scanning manner of the timing controller during the dark state period.

2. The driving apparatus of claim 1, wherein the image processing unit comprises:

a frequency multiplication unit, for adjusting the operation period of the image data; and

an image calculation unit, outputting a dynamic backlight control signal and a display data according to the adjusted image data, wherein the display data comprises the image period and the dark state period,

wherein the timing controller outputs the gray scale image data according to the display data during the dark state period, and the backlight controller adjusts the brightness of the backlight sources according to the dynamic backlight control signal.

3. The driving apparatus according to claim 2, wherein the timing controller outputs the adjusted image data during the image period, and the backlight controller sequentially adjusts the brightness of the backlight sources during the image adjusting period according to the adjusted image data and the scanning manner of the timing controller.

4. The driving apparatus of claim 1, wherein the timing controller outputs the adjusted image data during the image period, and the backlight controller sequentially turns on the backlight sources and adjusts the brightness of the backlight sources according to the adjusted image data.

5. The driving apparatus of claim 1, wherein the backlight controller sequentially turns on/off the backlight sources during the dark state period according to the scanning manner of the timing controller.

6. The driving apparatus of claim 1, wherein the backlight controller comprises:

a pulse width modulation (PWM) generating circuit, for generating a PWM signal; and

a backlight driving circuit, adjusting the brightness of the backlight sources according to the PWM signal.

7. The driving apparatus of claim 1, wherein the backlight sources comprise cold cathode fluorescent lamps or light emitted diodes.

8. The driving apparatus of claim 1, wherein the scanning manner of the timing controller comprises scanning from top to bottom, scanning from bottom to top, scanning outwards from the centre, scanning from top and bottom towards the middle, or scanning by blocks.

9. The driving apparatus of claim 1, wherein the gray scale image data comprises black image data or gray image data.

10. A driving method, for driving a displayer to display an image data, the image data comprising at least one frame period, the driving method comprising:

receiving the image data;

adjusting the operation period of the image data, and dividing the frame period into an image period and a dark state period;

outputting a gray scale image data during the dark state period; and

sequentially adjusting the brightness of a plurality of backlight sources according to the scanning manner of the display during the dark state period.

11. The driving method of claim 10, wherein adjusting the image data further comprises:

outputting a dynamic backlight control signal and a display data according to the adjusted image data, wherein the display data comprises the image period and the dark state period.

12. The driving method of claim 11, wherein outputting the gray scale image data during the dark state period further comprises:

outputting the adjusted image data during the image period according to the display data; and

adjusting the brightness of the backlight sources according to the dynamic backlight control signal.

13. The driving method of claim 10, wherein the step of sequentially adjusting the brightness of the backlight sources according to the scanning manner of the display further comprises:

sequentially turning off the backlight sources during the dark state period; and

sequentially turning on the backlight sources during the image period.

14. The driving method of claim 10, wherein the scanning manner of the display comprises scanning from top to bottom, scanning from bottom to top, scanning outwards from the center, scanning from top and bottom to the middle, or scanning by blocks.

15. The driving method of claim 10, wherein the gray scale image data comprises black image data or gray image data.