The invention discloses a pixel circuit, a driving method thereof, a display panel and a
display device. The pixel circuit comprises a data write-in unit, a
liquid crystal capacitor, a
power supply unit and a
control signal output unit; the data write-in unit is used for writing a data
voltage in a data line into a first end of the
liquid crystal capacitor at the normal display stage; the
control signal output unit is used for collecting the data
voltage which is supplied to the pixel circuit by the data line at the normal display stage, generating a corresponding charging
control signal according to the collected data
voltage and transmitting the charging control
signal to the
power supply unit at the
static display stage; the
power supply unit is used for charging the
liquid crystal capacitor according to the charging control
signal till the voltage difference of both ends is Vdata-Vcom. According to the technical scheme, the power supply unit and the control
signal output unit are arranged in the pixel circuit, so that the liquid
crystal capacitor can be charged at the
static display stage, at the moment, it is not needed to load any scanning signal to a grid line, and thereby
power consumption of the display panel can be lowered.