Pixel circuit and display apparatus

摘要

It is aimed to increase efficiency and simplification of a pixel circuit having a threshold voltage correcting function. A sampling transistor Tr1 is brought into conduction in response to a control signal supplied from a scan line WS and samples a video signal supplied from a signal line SL to a pixel capacitor Cs during a horizontal scanning period. The pixel capacitor Cs applies an input voltage Vgs to a gate G of a drive transistor Trd in response to the sampled video signal. The drive transistor Trd supplies an output current in accordance with the input voltage Vgs to a light-emitting device EL. The output current has dependency on a threshold voltage Vth of the drive transistor Trd. In order to cancel the dependency of the output current on the threshold voltage Vth, there is provided correcting means (Tr3 and Tr4) for operating in part of the horizontal scanning period, detecting the threshold voltage Vth of the drive transistor Trd, and writing the threshold voltage Vth in the pixel capacitor Cs.