Technique for maintaining color accuracy and reduce power consumption for lcds
AssigneeATI Technologies ULC
InventorsTroy Alexander Giorshev, Shu Key Keith Lee
Life of this patent
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Abstract
A quantum dot liquid crystal display has a backlight generated by a light emitting diode (“LED”) that is typically blue and a quantum dot film that performs color conversion to red and green to produce white light. While cheap and efficient, the LEDs in such displays illuminate the pixels unevenly, and the distribution of uneven illumination is different for different wavelengths of light (e.g., red, green, and blue). A technique to compensate for this aspect includes measuring certain optical characteristics of the uneven illumination distribution, processing such measurements, and applying the results of such processing to the “desired” input image to generate an output image for display.
Claims20
A method for controlling a display device, the method comprising:
- receiving a desired color for a pixel based on an input image;
- and
- applying activation values to the pixel to cause the pixel to output the desired color, wherein:
- the activation values are based on a backlight-based modification and the desired color;
- the backlight-based modification is based on backlight levels for a plurality of backlights and stored per-backlight, per-pixel data, and
- the stored per-backlight, per-pixel data comprises a measured contribution for the pixel obtained with a respective backlight illuminated and other backlights of the plurality of backlights not illuminated.
A system comprising:
- a plurality of backlights;
- a pixel;
- and
- control circuitry configured to:
- receive a desired color for the pixel based on an input image;
- and
- apply activation values to the pixel to cause the pixel to output the desired color, wherein:
- the activation values are based on a backlight-based modification and the desired color;
- the backlight-based modification is based on backlight levels for the plurality of backlights and stored per-backlight, per-pixel data, and
- the stored per-backlight, per-pixel data comprises a measured contribution for the pixel obtained with a respective backlight illuminated and other backlights of the plurality of backlights not illuminated.
A non-transitory computer-readable medium storing instructions that, when executed by a processor, cause the processor to perform operations comprising:
- receiving a desired color for a pixel based on an input image;
- and
- applying activation values to the pixel to cause the pixel to output the desired color, wherein:
- the activation values are based on a backlight-based modification and the desired color;
- the activation values are based on a backlight-based modification and the desired color;
- the backlight-based modification is based on backlight levels for a plurality of backlights and stored per-backlight, per-pixel data, and
- the stored per-backlight, per-pixel data comprises a measured contribution for the pixel obtained with a respective backlight illuminated and other backlights of the plurality of backlights not illuminated.
Dependencies are inferred from the claim text.