Pixel circuit, drive method thereof and display device

The invention provides a pixel circuit, a drive method thereof and a display device. The pixel circuit comprises a feedback unit and a drive tube. The feedback unit is used for feeding back the threshold voltage of the drive tube and the migration rate difference to the drive tube and connected with a first voltage source, the drive tube is a double-gate transistor, the first gate of the drive tube is used for being connected with data signals, the first electrode and the second gate of the drive tube are connected with the feedback unit, and the second electrode of the drive tube is used for outputting the drive current. According to the pixel circuit, the double-gate transistor serves as the drive tube, the drifting of the threshold voltage of the drive tube and the migration rate difference can be offset, and therefore the problem that due to the drifting of the threshold voltage of the drive tube and the migration rate difference, the light emitting luminance of light emitting devices is not even is solved. Meanwhile, by means of the pixel circuit, the display aperture ratio and the resolution ratio can be increased, and low cost can be guaranteed.