Pixel circuit and driving method thereof, and display device

A pixel circuit and a driving method thereof, and a display device are provided. The pixel circuit includes a light-emitting time control module, a current control module and a light-emitting module. The light-emitting time control module includes a first drive module, a coupling module and a first voltage writing module. The first voltage writing module is used to output a fixed voltage to a control end of the first drive module, the coupling module is connected to the control end of the first drive module, a first end of the first drive module is used to output the control voltage to a control end of the current control module, and an output end of the current control module is connected to the light-emitting module. The present invention couples the first data voltage to the control end of the first drive module through the coupling module, so that according to the first data voltage to set the conducting state of the first drive module is unnecessary, and the first power supply voltage is elastic. Thereby