New voltage programming LTPS‐TFT pixel scaling down VTH variation for AMOLED display

Abstract A new voltage‐scaled compensation pixel which employs 3 p‐type poly‐Si TFTs and 2 capacitors without additional control line has been proposed and verified. The proposed pixel does not employ the VTH memorizing and cancellation, but scales down the inevitable VTH variation of poly‐Si TFT. Also the troublesome narrow input range of VDATA is increased and the VDD supply voltage drop is suppressed. In our experimental results, the OLED current error is successfully compensated by easily controlling the proposed voltage scaling effects.