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US 11,636,814 B2Granted
Techniques for improving the color accuracy of light-emitting diodes in backlit liquid-crystal displays
AssigneeNVIDIA Corporation
InventorGerrit Slavenburg
Life of this patent
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Abstract
A display device includes an array of LEDs, an array of LCD pixels, and a display controller. The display controller is configured to compensate for one or more sources of color variation in light produced by the LEDs. The display controller can determine a first color variation at a given LCD pixel based on the distance between the given LCD pixel and one or more LEDs. The display controller can also determine a second color variation at the given LCD pixel based on a current level supplied to the one or more LEDs. The display controller configures the given LCD pixel to filter light that is received from the one or more LEDs in a manner that reduces or eliminates either or both of the first and second color variations.
Claims18
A computer-implemented method for configuring a plurality of screen pixels to display an image, the method comprising:
- determining a first current level to be supplied to a first light source based on a first image, wherein the first light source is associated with light having a first color value in a color space;
- determining a second color value in the color space, wherein the second color value is associated with a first portion of the first image;
- determining a first screen pixel responsible for displaying at least part of the first portion of the first image, wherein the first screen pixel is separate from the first light source;
- determining, based on the first current level, a first color variation of the first color value in the color space, wherein the first color variation of the first color value is associated with light that is emitted by the first light source in response to the first current level being applied to the first light source, and wherein the first light source emits light having a plurality of different color values in the color space in response to being supplied with a plurality of different current levels;
- and
- causing the first screen pixel to compensate for the first color variation of the first color value and a second color variation that is determined based on a second current level applied to a second light source while the first current level is applied to the first light source and to output light having the second color value based on a function of the first color variation of the first color value, the second color variation, and the second color value, wherein the first current level is different from the second current level.
3 more elements
A display device, comprising:
- a display screen, including:
- a plurality of light sources, and
- a plurality of screen pixels that emit light when illuminated by the plurality of light sources;
- and
- a display controller that causes the display screen to display a first image by performing the steps of:
- determining a first current level to be supplied to a first light source based on the first image, wherein the first light source is associated with light having a first color value in a color space, determining a second color value in the color space,
- wherein the second color value is associated with a first portion of the first image, determining a first screen pixel responsible for displaying at least part of the first portion of the first image, wherein the first screen pixel is separate from the first light source,
- determining, based on the first current level, a first color variation of the first color value in the color space, wherein the first color variation of the first color value is associated with light that is emitted by the first light source in response to the first current level being applied to the first light source, and wherein the first light source emits light having a plurality of different color values in the color space in response to being supplied with a plurality of different current levels, and
- causing the first screen pixel to compensate for the first color variation of the first color value and a second color variation that is determined based on a second current level applied to a second light source while the first current level is applied to the first light source and to output light having the second color value based on a function of the first color variation of the first color value, the second color variation, and the second color value, wherein the first current level is different from the second current level.
6 more elements
A display controller included within a display device for configuring a plurality of pixels to display an image, the display controller comprising:
- a current level generator within the display controller that determines a first current level to be supplied to a first light source based on a first image to be displayed, wherein the first light source illuminates a first screen pixel when supplied with the first current level;
- a contribution generator within the display controller that determines a first color value in a color space, wherein the first color value is associated with light that is contributed to the first screen pixel by the first light source when the first light source illuminates the first screen pixel, wherein the first light source emits light having a plurality of different color values in the color space in response to being supplied with a plurality of different current levels;
- and
- a first functional operator that divides a value that is based on the first color value by a second color value associated with a first portion of the first image to generate a first percentage, wherein a display screen included in the display device displays at least part of the first portion of the image based on the first percentage.
1 more element
Dependencies are inferred from the claim text.