Method, system and apparatus for power saving backlight
AssigneeChihao XU
InventorsAndreas Karrenbauer, Marc Albrecht, Chihao Xu
Life of this patent
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Abstract
A method and system for displaying an image on a liquid crystal display (LCD) that may reduce power consumption. The method and system can include calculating a luminance for pixels in an image in a LCD based upon a light spread function and brightness values of light emitting diodes (LEDs). The method and system can also include changing a brightness of an LED based upon a consideration of the gray value of the pixels and the distance of the pixels from a dominant LED. The method and system can further set the brightness of the LED units to a brightness or brightness value substantially greater than or equal to a gray value of each pixel of the image.
Claims23
A method of lighting a liquid crystal display, comprising:
- calculating a luminance for a plurality of pixels in an image in a liquid crystal display (LCD) based upon a light spread function and a brightness value of light emitting diodes (LEDs);
- changing the brightness value of one or more LEDs based upon a consideration of a gray value of the plurality of pixels and luminance generated by other LEDs;
- performing iterative steps for changing the LED brightness values to successively cover a pixel gray value of the plurality of pixels;
- and
- setting the brightness value of the LEDs to a brightness value substantially greater than or equal to a gray value of a majority of the pixels of the image, and
- further comprising establishing an influence queue for each pixel in the plurality of pixels by considering the influences of the LEDs on each pixel in the plurality of pixels.
A liquid crystal display, comprising:
- a plurality of pixels to display an image;
- a backlight with a plurality of light emitting diodes (LEDs);
- a processor that calculates a luminance for the plurality of pixels in an image in the liquid crystal display, changes a brightness of a light emitting diode based upon gray values of a number of the plurality of pixels and luminance generated by other LEDs, performs iterative steps to change LED brightness values to successively cover a pixel gray value of the plurality of pixels and sets the brightness value of the LEDs to a brightness value substantially greater than or equal to a gray value of a majority of the pixels of the image and
- an influence queue for each pixel in the plurality of pixels established through a consideration of the influences of the LEDs on each pixel in the plurality of pixels.
A system for providing an image on a liquid crystal display, comprising:
- a plurality of pixels that display an image on a liquid crystal display (LCD);
- a backlight having a plurality of light emitting diodes (LEDs) that light the image;
- and
- at least one processor that calculates a luminance for the plurality of pixels in the image on the LCD based upon a light spread function and a brightness value of the LEDs, changes the brightness value of the plurality of LEDs based upon a consideration of a gray value of the plurality of pixels and luminance generated by other LEDs, performs iterative steps for changing the LED brightness values to successively cover a pixel gray value of the plurality of pixels and sets the brightness value of the LEDs to a brightness value substantially greater than or equal to a gray value of a majority of the pixels of the image, wherein the processor further establishes an influence queue for each pixel in the plurality of pixels through a determination of the influences of the LEDs on each pixel in the plurality of pixels.
Dependencies are inferred from the claim text.