Adaptive headroom adjustment systems and methods for electronic device displays

A method, comprising:

• operating an array of light-emitting diodes in an electronic device during a current backlight frame, the array of light-emitting diodes comprising a plurality of rows of the light-emitting diodes and individually operable zones that each include at least a portion of at least one of the rows;
• determining, during the current backlight frame, a maximum zone current of the individually operable zones based on an expected zone current comprised of a maximum of currents expected to be applied to any of a plurality of operable zones for an upcoming backlight frame, determining a maximum row current comprised of a maximum of all expected currents associated with all of the plurality of rows for the upcoming backlight frame, and determining a maximum row-to-row current step comprised of an expected maximum current step between two rows in the array of light-emitting diodes for the upcoming backlight frame;
• and
• determining a supply voltage update for a power supply for the array of light-emitting diodes based on the determined maximum zone current, maximum row current, and maximum row-to-row current step if any of the maximum zone current, the maximum row current, or the maximum row-to-row current step for the upcoming backlight frame is different from a maximum zone current, a maximum row current, or a maximum row current step for the current backlight frame.

An electronic device, comprising:

• backlight circuitry configured to operate an array of light-emitting diodes during a current backlight frame, the array of light-emitting diodes comprising a plurality of rows of light-emitting diodes and individually operable zones that each include at least a portion of at least one of the rows;
• and
• host circuitry configured to:
• determine, during the current backlight frame, a maximum zone current of the individually operable zones based on an expected zone current for each zone for an upcoming backlight frame, the maximum zone current comprised of a maximum of the currents expected to be applied to any of the plurality of operable zones during the upcoming backlight frame, determining a maximum row current for the plurality of rows for the upcoming backlight frame, the maximum row current comprised of a maximum of all expected currents associated with all rows during the upcoming backlight frame, and determining a maximum row-to-row current step between two rows in the array of light-emitting diodes for the upcoming backlight frame, the maximum row-to-row current step comprised of an expected maximum current step between two rows in the array of light-emitting diodes during the upcoming backlight frame;
• and
• determine a supply voltage update for a power supply for the array of light-emitting diodes based on the determined maximum zone current, maximum row current, and maximum row-to-row current step if any of the maximum zone current, the maximum row current, or the maximum row-to-row current step for the upcoming backlight frame is respectively different from a maximum zone current, a maximum row current, or a maximum row current step for the current backlight frame.