A Single Driver Chip for Gray Scale Passive-Matrix OLED

A single driver chip for the 132times64-pixel passive-matrix OLED panel is presented. The developed driver chip has a 64-step gray scale control using PWM method and two-step voltage pre-charge technology to pre-charge the OLED pixels. It consists of a digital controller, a SRAM as display data memory, a DC-DC voltage converter, reference current generators, a pre-charge voltage generator, 64 common drivers and 132 segment drivers. The chip is a typical current-drive circuit. Power consumption of the whole chip and all pixels with a constant driver current 100 muA is investigated by the Nanosim simulation. When all pixels displaying the highest gray scale, it is shown that the consumed power is about 340 mW at 15 V high voltage supply and 3.3 V low voltage supply