An a-IGZO TFT AMOLED Pixel Circuit to Compensate Threshold Voltage and Mobility Variations

Abstract

A voltage-programming pixel circuit for AMOLED display on the basis of a-IGZO TFTs is proposed. A diode-connected structure of the driving TFT is used to compensate the variations in threshold voltage (VTH) and mobility to reduce the current error rate (CER). The proposed circuit requires only two types of controlling lines. The simulation results show that the CERs are decreased to 5.8% for mobility variations of ±30%, and 11.6% for VTH variation of ±0.4V.