A pixel circuit includes a pixel driving circuit and a display data inputting circuit configured to provide display data for the pixel driving circuit. The display data inputting circuit includes a gating inputting unit configured to, when a line scanning signal is valid, provide at different periods of time, red-color, green-color and blue-color display data for the pixel driving circuit through a data line connected with a resistor-capacitor unit in parallel. The display data inputting circuit further includes a data line setting unit configured to, after the gating inputting unit provides the red-color, the green-color or the blue-color display data for the pixel driving circuit through the data line, set a voltage of the data line to a reference voltage, so that residual display data in the data line is released by the resistor-capacitor unit; and a voltage value of the reference voltage is less than a predetermined value.