Jaffery Watson Mendonsa & Hamilton LLP
Load transient response control systems and methods for electronic device displays
Aspects of the subject technology relate to control circuitry for light-emitting diodes. The control circuitry may include a feedforward loop and a feedback loop for a power supply for the light-emitting diodes. The light-emitting diodes may be arranged in strings that are individually controllable by a current control transistor on the string. The feedforward loop may determine a total upcoming load current for the power supply based on reference voltages for controlling each of the current control transistors. The output of the power supply may be modified based on a combination of a current from the feedforward loop and a current from the feedback loop.
Apple Inc.
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H05B H05B G02F G02F H05B
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Ji Yeoul Jingdong Mohammad J. Asif Yanhui
Ryoo Chen Navabi-Shirazi Hussain Xie