New pixel circuits for driving organic light emitting diodes with low temperature polycrystalline Si thin film transistors

Abstract

Two new pixel circuits for active matrix organic light emitting diode (AM-OLED), based on the low-temperature polycrystalline Si thin-film transistors (LTPS-TFTs) are proposed and the Vth compensation ability is verified by SPICE simulation and measured results. The voltage-programming pixel circuits are formed by five TFTs, one additional control signal, and one storage capacitor. The simulation and measured results show that the pixel circuit has high immunity to the variation of poly-Si TFT characteristics.