Patent ID: 11967290
Assignee: APPLE INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. An electronic display device comprising:
a liquid crystal display panel;
a backlight comprising a plurality of light-emitting diodes configured to emit light through the liquid crystal display panel; and
one or more processors configured to:
receive a present brightness and a target brightness for the plurality of light-emitting diodes;
determine a transition curve between the present brightness and the target brightness;
interpolate, on the transition curve, a sloped brightness for the plurality of light-emitting diodes based at least in part on the present brightness, the target brightness, and a temperature of the plurality of light-emitting diodes;
estimate a power consumption for a light-emitting diode row of the plurality of light-emitting diodes based on the sloped brightness of the light-emitting diode row;
receive stored power consumption for other light-emitting diode rows of the plurality of light-emitting diodes;
determine a total power consumption for the plurality of light-emitting diodes;
determine whether the total power consumption for the plurality of light-emitting diodes exceeds a threshold power consumption;
in response to determining that the total power consumption for the plurality of light-emitting diodes exceeds the threshold power consumption:
receive or determine a current to supply to one or more light-emitting diodes of the plurality of light-emitting diodes;
determine a reduced voltage level to supply to the one or more light-emitting diodes based on the current of the one or more light-emitting diodes, wherein the reduced voltage level is less than a uniform voltage used for other light-emitting diodes of the plurality of light-emitting diodes and is greater than a minimum voltage of the one or more light emitting diodes of the plurality of the light-emitting diodes; and
supply the current and the reduced voltage level to the one or more light-emitting diodes; and

in response to receiving an indication of a new image frame comprising one or more pixel values to be written to one or more pixels of the liquid crystal display panel:
send an interrupt, via a controller of the liquid crystal display panel, to the backlight to prevent updating the one or more light-emitting diodes of the plurality of the light-emitting diodes, wherein the one or more light-emitting diodes corresponds to the one or more pixels of the liquid crystal display panel;
cancel the interrupt, via the controller of the liquid crystal display panel, after the one or more pixel values are written to the one or more pixels of the liquid crystal display panel and the one or more pixels settling; and
in response to cancelling the interrupt, update the one or more light-emitting diodes corresponding to the one or more pixels based on the one or more pixel values.