公开(公告)号：WO2022056406A1

公开(公告)日：2022-03-17

申请号：PCT/US2021/050110

申请日：2021-09-13

Applicant: APPLE INC.

Inventor： CHAPPALLI, Mahesh B. ,  MENACHEM, Assaf ,  DAR, Daniel Yechiel ,  SOFFAIR, Ido Yaacov

IPC: G09G3/20 ,  G09G3/34 ,  G09G5/00

Abstract: An electronic display device has a panel (16) that operates in conjunction with a light-emitting diode (LED) backlight. The device "slopes" or gradually ramps a change in brightness of an LED (18) based on a target brightness value (84) of the LED (18), a current brightness value of the LED (18), and temperature (88) at the LED (18). The device also may limit power to the backlight (17) based on an estimated power consumption (120) of a current row of LEDs (18) of the backlight (17) and power consumption of the other rows of LEDs (18). The device also may determine a reduced voltage (154) to supply to an LED (18) based on a current (210) to supply to the LED (18) to cause the LED (18) to operate. The device also may send an interrupt (180) to the backlight (17) to block updates to the backlight (17) while image content is written to pixels of the panel (16). The device further compensates for aging of and temperature (88) at an LED (18).