METHODS AND SYSTEMS FOR ADJUSTING BACKLIGHT LUMINANCE

• US 20080266235A1
• Filed: 04/30/2007
• Published: 10/30/2008
• Est. Priority Date: 04/30/2007
• Status: Abandoned Application

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Hupman, Paul M., Carroll, Barry N.
• Application Number:
  US11/742,575
• Publication Number:
  US 20080266235A1
• 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 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336

Abstract

A display system is provided, the display system having a processor and a Liquid Crystal Display (LCD) coupled to the processor. The display system also includes a backlight for the LCD panel, the backlight having an adjustable backlight luminance. The processor causes a plurality of successive image frames to be displayed on the LCD panel. The backlight luminance is selectively adjusted for each of the image frames.

Claims

1. A display system, comprising:

a processor;

a Liquid Crystal Display (LCD) panel coupled to the processor; and

a backlight for the LCD panel, the backlight having an adjustable backlight luminance,

wherein the processor causes a plurality of successive image frames to be displayed on the LCD panel and wherein the backlight luminance is selectively adjusted for each of the image frames.

2. The display system of claim 1 wherein luminance of the LCD panel is based on a color detail control signal and a backlight control signal associated with each of the image frames.

3. The display system of claim 2 wherein color detail control signal is a multi-bit digital signal.

4. The display system of claim 2 wherein backlight control signal is a multi-bit digital signal.

5. The display system of claim 1 wherein the backlight comprises a light-emitting diode (LED).

6. The display system of claim 1 wherein the processor comprises a video controller that receives image data and that selectively adjusts the backlight luminance based on information extracted from the image data.

7. The display system of claim 1 further comprising a system memory coupled to the processor, the system memory comprises at least one frame buffer to store each of the image frames before each image frame is displayed on the LCD panel, wherein the backlight luminance is selectively adjusted based on information extracted from the at least one frame buffer.

8. The display system of claim 1 further comprising a system memory coupled to the processor, the system memory comprises color detail instructions that, when executed, cause the processor to examine pixel color values of each image frame and to control a light aperture of the LCD panel based on the pixel color values.

9. The display system of claim 1 further comprising a system memory coupled to the processor, the system memory comprises backlight control instructions that, when executed, cause the processor to examine pixel luminance values of each image frame and to output a backlight control signal to adjust the backlight luminance based on the pixel luminance values.

10. The display system of claim 9 wherein the backlight control signal is based on at least one of a minimum pixel luminance value determined for each image frame, a maximum pixel luminance value determined for each frame, and an average pixel value determined for each frame.

11. A method, comprising:

providing successive image frames to be displayed on a Liquid Crystal Display (LCD) panel; and

selectively adjusting a backlight luminance of the LCD panel for each of the image frames.

12. The method of claim 11 further comprising extracting information from each image frame to determine the backlight luminance.

13. The method of claim 11 further comprising analyzing pixel luminance values for each image frame and adjusting the backlight luminance based on the pixel luminance values.

14. The method of claim 11 further comprising analyzing pixel luminance values for each image frame and adjusting the backlight luminance based on a minimum pixel luminance value.

15. The method of claim 11 further comprising generating a multi-bit digital signal to control the backlight luminance based on at least one of a minimum pixel luminance value of each image frame, a maximum pixel luminance value of each image frame and an average pixel luminance value of each image frame.

16. The method of claim 11 further comprising controlling a color depth of the LCD panel for each frame based on a color detail control signal and a backlight control signal.

17. The method of claim 16 further comprising selectively changing a number of bits used to control the color depth.

18. The method of claim 11 wherein selectively adjusting a backlight luminance of the LCD panel for each of the image frames comprises adjusting luminance of a light-emitting diode (LED).

19. A computer-readable medium storing instructions executable by a processor, the instructions cause the processor to:

analyze successive image frames to be displayed on a Liquid Crystal Display (LCD) panel; and

selectively adjust a backlight luminance of the LCD panel for each of the image frames.

20. The computer-readable medium of claim 19 wherein the instructions further cause the processor to analyze pixel luminance values for each image frame and adjust the backlight luminance based on the pixel luminance values.

21. The computer-readable medium of claim 19 wherein the instructions further cause the processor to control color depth for each image frame by providing a color detail control signal and a backlight control signal.