Displays with adjustable direct-lit backlight units
First Claim
1. An electronic device comprising:
- a plurality of pixels;
a backlight having a plurality of light-emitting diodes that are configured to produce backlight illumination for the plurality of pixels; and
control circuitry configured to;
during a first frame, determine brightness values for the plurality of light-emitting diodes based on a first set of image data;
during a second frame that is subsequent to the first frame, display images using a second set of image data while the plurality of light-emitting diodes produces backlight illumination using the brightness values determined during the first frame; and
during the second frame, generate a simulated backlight reconstruction based on the brightness values determined during the first frame.
1 Assignment
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Accused Products
Abstract
A display may have a pixel array such as a liquid crystal pixel array. The pixel array may be illuminated by a backlight unit that includes an array of light-emitting diodes. A backlight brightness selection circuit may select brightness values for the light-emitting diodes. The backlight brightness selection circuit may select the brightness values based on image data, based on brightness values used in previous image frames, based on device information, and/or based on sensor information. The backlight brightness selection circuit may select the backlight brightness levels to mitigate visible artifacts such as flickering and halo. The backlight levels selected by the backlight brightness selection may be modified by a power consumption compensation circuit. The power consumption compensation circuit may estimate the amount of power consumption required to operate the backlight using the target brightness levels and may modify the target brightness levels to meet maximum power consumption requirements.
34 Citations
10 Claims
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1. An electronic device comprising:
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a plurality of pixels; a backlight having a plurality of light-emitting diodes that are configured to produce backlight illumination for the plurality of pixels; and control circuitry configured to; during a first frame, determine brightness values for the plurality of light-emitting diodes based on a first set of image data; during a second frame that is subsequent to the first frame, display images using a second set of image data while the plurality of light-emitting diodes produces backlight illumination using the brightness values determined during the first frame; and during the second frame, generate a simulated backlight reconstruction based on the brightness values determined during the first frame. - View Dependent Claims (2, 3, 4, 5)
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6. An electronic device comprising:
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a plurality of pixels; a backlight having a plurality of light-emitting diodes that are configured to produce backlight illumination for the plurality of pixels; and control circuitry configured to; during a first frame, determine brightness values for the plurality of light-emitting diodes based on a first set of image data; and during a second frame that is subsequent to the first frame, display images using a second set of image data while the plurality of light-emitting diodes produces backlight illumination using the brightness values determined during the first frame, wherein determining the brightness values for the plurality of light-emitting diodes based on the first set of image data comprises determining initial target brightness values based on content of the first set of image data. - View Dependent Claims (7, 8, 9)
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10. An electronic device comprising:
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a plurality of pixels; a backlight having a plurality of light-emitting diodes, wherein each one of the plurality of light-emitting diodes is configured to produce backlight illumination for a respective subset of the plurality of pixels; and control circuitry configured to generate a brightness value for each one of the plurality of light-emitting diodes based on image data for the respective subset of the plurality of pixels associated with that light-emitting diode, wherein the control circuitry is configured to use a temporal filter and backlight brightness values from a previous frame to generate the brightness values for the plurality of light-emitting diodes.
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Specification