IMAGE DISPLAY DEVICE AND METHOD

• US 20080291153A1
• Filed: 05/22/2008
• Published: 11/27/2008
• Est. Priority Date: 05/22/2007
• Status: Active Grant

• Current Assignee: Hong Kong Applied Science And Technology Research Institute Co., Ltd.
• Original Assignee: Hong Kong Applied Science And Technology Research Institute Co., Ltd.
• Inventors: Zhang, Wei, Tsai, Chen-Jung, Peng, Huajun, Hung, Chun-Kit
• Granted Patent: US 8,243,007 B2
• Time in Patent Office: Days
• US Class Current: 345/102
• CPC Class Codes: G09G 2320/062 Adjustment of illumination source parameters
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers

Abstract

An image display device is presented to solve problems of high power consumption, insufficient contrast, image flicker, and distortion of image display devices. The image display device includes an image display management module which includes a backlight control unit. The backlight control unit includes an image brightness analyzer, generating a brightness value according to an input image data; a weight generator, generating a weight according to the brightness value; an image variation analyzer, analyzing the input image data to generate an image variance; and a backlight factor generator, coupled to the weight generator and the image variation analyzer to generate a backlight adjusting signal according to the weight and the image variance. By the backlight adjusting signal, the image display device achieves the power-saving and contrast enhancement effects.

Claims

1. An image display management module, comprising a backlight control unit which comprises:

a histogram generator generating a brightness histogram according to an image data of an input frame;

a weight generator presetting corresponding weights according to a plurality of image brightness values and coupled to the histogram generator generating a weight corresponding to the input frame;

an image variation analyzer analyzing the image data of the input frame to generate an image variance; and

a backlight factor generator coupled to the weight generator and the image variation analyzer to generate a backlight adjusting signal according to the weight and the image variance of the input frame.

2. The image display management module according to claim 1, further comprising an image control unit comprising:

a low-pass filter for blurring the input image data;

a gain factor selector coupled to the low-pass filter to generate more than one gain factor according to the blurred image data and the backlight adjusting signal; and

an output data generator coupled to the gain factor selector and the backlight factor generator to generate an output image data.

3. The image display management module according to claim 2, wherein the output image data is generated by the output data generator according to the input image data, the gain factors, and the backlight adjusting signal.

4. The image display management module according to claim 1, wherein the weight generator coupled to the histogram generator comprises:

generating an average brightness of the input frame according to the histogram; and

generating, by the weight generator, a weight corresponding to the frame according to the average brightness value.

5. The image display management module according to claim 1, wherein the weight generator coupled to the histogram generator comprises:

generating a weighted average brightness of the input frame according to the preset weights and the histogram; and

generating, by the weight generator, a weight corresponding to the frame according to the weighted average brightness value.

6. The image display management module according to claim 1, wherein the preset weights in the weight generator increase with an increase of the brightness values or remain unchanged.

7. The image display management module according to claim 1, wherein the image variation analyzer calculates according to the average brightness value of the image or the weighted average brightness of the image in claim 4.

8. An image display comprising the image display management module according to claim 1, generating a compensated image output according to the image data and the backlight adjusting signal.

9. A method for compensating an input image data, comprising:

determining, by a histogram generator, a brightness histogram of the input image data;

generating, by a weight generator, a weight according to the brightness histogram;

analyzing, by an image variation analyzer, the input image data to generate an image variance;

generating, by a backlight factor generator, a backlight adjusting signal according to the histogram weight and the image variance; and

generating a compensated image output according to the backlight adjusting signal and image data from an image control unit.

10. The method according to claim 9, wherein the output image data is generated by an output data generator according to multiple gain factors, the input image data, and the backlight adjusting signal.

11. The method according to claim 9, wherein the output image data is generated by an output data generator according to multiple gain factors and the input image data.

12. The method according to claim 9, wherein the gain factors are generated through processing the input image data blurred by a low-pass filter by a gain factor selector.

13. An image display management module, comprising an image control unit which comprises:

a low-pass filter for blurring an input image data;

a gain factor selector coupled to the low-pass filter to determine multiple gain factors; and

an output data generator coupled to the gain factor selector to generate an output image data.

14. The image display management module according to claim 13, further comprising a backlight control unit which comprises:

a histogram generator, generating a histogram value according to the input image data;

a weight generator coupled to the histogram generator to generate a weight of the histogram value;

an image variation analyzer analyzing the input image data to generate an image variance; and

a backlight factor generator coupled to the weight generator and the image variation analyzer to generate a backlight adjusting signal according to the weight and the image variance;

wherein the backlight control unit is coupled to the output data generator to provide the backlight adjusting signal to the output data generator.

15. The image display management module according to claim 13, wherein the backlight factor generator is coupled to an image display to provide the backlight adjusting signal to the image display.

16. The image display management module according to claim 13, wherein the output image data is generated by the output data generator according to the input image data, the gain factors, and the backlight adjusting signal.

17. An image display comprising the image display management module according to claim 13, generating a compensated image output according to the image data and the backlight adjusting signal.

18. A method for compensating an input image data, comprising:

blurring by a low-pass filter, an input image data;

determining, by a gain factor selector, multiple gain factors according to the blurred input image data;

generating, by an output data generator, an output image data according to the multiple gain factors and the input image data; and

generating a compensated image output according to the output image data and a backlight adjusting signal from a backlight control unit.

19. The method according to claim 18, wherein the backlight adjusting signal is generated by a backlight factor generator according to a weight and an image variance.

20. The method according to claim 19, wherein the weight is generated by a weight generator according to a histogram of the input image data.

21. The method according to claim 19, wherein the image variance is generated through analyzing the input image data by an image variation analyzer.