Pixel circuit, display device, and method of driving pixel circuit

Abstract

A pixel circuit, a display device, and a method of driving a pixel circuit able to obtain a source-follower output without luminance deterioration even when the current-voltage characteristic of a light emitting element changes due to aging, making a source-follower circuit of n-channel transistors possible, and in addition able to display uniform and high quality images not without regard to variations of threshold values and mobilities of the active elements inside pixels, wherein a capacitor Cis connected between a gate and a source of a TFT, the source side of the TFTis connected to a fixed potential (GND) through a TFT, a predetermined reference current Iref is supplied to the source of the TFTwith a predetermined timing, a voltage corresponding to the reference current Iref is held, and an input signal voltage centered about the voltage is coupled, whereby an EL light emitting elementis driven centered about the center value of variation of the mobilities.