Morgan, Lewis & Bockius LLP
LED driver gate clamp systems and methods
Aspects of the subject technology relate to display circuitry such as backlight control circuitry for operating light-emitting diodes (LEDs). The backlight control circuitry may include a pulse-width-modulation (PWM) transistor and a current regulation transistor coupled in series with at least one LED. The current regulation transistor may have a gate terminal that receives a feedback-controlled gate voltage. The backlight control circuitry may include a gate clamp circuit coupled to the gate terminal of the current regulation transistor that clamps the gate voltage during a portion of a PWM on pulse.
Apple Inc.
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Y02B H05B H05B H05B
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Mohammad J. Asif Jingdong Yanhui
Navabi-Shirazi Hussain Chen Xie