A High-Efficiency Charge Pump for AMOLED Display Driver IC

Abstract

In this paper, we propose a novel efficiency-optimized charge pump for AMOLED display driver IC. In our design, we not only present a switching-voltage dynamic adjustment technique, but also utilize a dynamic biasing method to minimize the on-resistance of the switches, and improve the efficiency of the proposed charge pump. To verified our design, a prototype charge pump has been fabricated by Nuvoton 0.35-μm 2P3M BCD process. The experimental results show that when the values of load current are respectively 0mA, 60mA and 120mA, the efficiencies of our proposed charge pump are effectively improved by 17.78%, 18.46%, and 18.6% compared to the conventional charge pump.