Jaffery Watson Mendonsa & Hamilton LLP
LED driver headroom voltage control systems and methods
Aspects of the subject technology relate to control circuitry for operating light-emitting diodes (LEDs). The control circuitry may include a pulse-width-modulation (PWM) driver for the LEDs and headroom voltage control circuitry. The PWM driver may adjust a rising edge or a trailing edge of the PWM cycles for various LEDs to ensure a headroom voltage detection window for the headroom voltage control circuitry to sample the headroom voltage of those LEDs without being affected by the rising edge of the PWM cycle for LED or the falling edge of the PWM cycle for another LED.
Apple Inc.
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Yanhui Asif Jingdong Mohammad J.
Xie Hussain Chen Navabi-Shirazi