Embodiments of the present disclosure provide a pixel circuit, a driving method thereof and a display device comprising the pixel circuit. The pixel circuit comprises a display unit and a first precharge unit; the first precharge unit is connected to the display unit, a (N−1)th scan line and a control line, and is configured to convert light energy into electric energy and to precharge the display unit with the converted electric energy under the control of the control line and the (N−1)th scan line; the display unit is further connected to the Nth scan line and a data line and is configured to charge the display unit through the data line under the control of the Nth scan line; wherein N≥2.