Display module, driving method thereof and display device

The invention discloses a display module, a driving method thereof and a display device. A flexible circuit board of the display module is bound on a display panel; the display panel comprises a power supply voltage signal line, and the power supply voltage signal line transmits a power supply voltage signal of a pixel driving circuit in the display panel. The display module further comprises a display driving chip and a power supply chip, the display driving chip is bound on the display panel, the power supply chip is bound on the flexible circuit board, and the power supply chip is grounded; a voltage control signal generated by the display driving chip controls the power supply chip to generate a power supply voltage signal and supply the power supply voltage signal to a power supply voltage signal line; the display driving circuit further comprises a protection circuit, the protection circuit is electrically connected with the power supply voltage signal line and the power supply chip, a first control sig