Integrated LED Driver Solution for Backlighting TFT-LCD Panels with Adaptive Power Control and Phase Shifted PWM Dimming

摘要

An adaptive power control scheme is presented for the light-emitting diode (LED) backlighting application. Instead of choosing the worst case output voltage for the DC/DC converter, the adaptive power control scheme adjusts the output voltage to keep track of LED forward voltage variation, reducing the power dissipation of the LED driver system and hence increasing the reliability of the integrated driver solution. Adaptive power control technology and phase shifted PWM dimming have been built into mixed-signal ASICs for TFT-LCD panels. The test bench result shows the power saving of the adaptive power control scheme.