Displays with adjustable direct-lit backlight units

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;
• 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.

An electronic device comprising:

• 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.