Display module, display device and working method of display device

The invention provides a display module, a display device and a working method of the display device, and belongs to the technical field of display. The display module comprises a display panel, and the display panel comprises a signal line which is used for being bound with a driving chip; the power module is used for providing electric signals; the potential monitoring module is used for monitoring the potential of the signal line and controlling the negative electrode of the power supply module to be communicated with the signal line when the potential of the signal line is greater than a preset value; and when the potential of the signal line is smaller than or equal to a preset value, the negative electrode of the power supply module is controlled to be disconnected from the signal line. According to the technical scheme, the signal lines of the display panel can be prevented from being corroded. 本发明提供了一种显示模组、显示装置及其工作方法，属于显示技术领域。其中，显示模组，包括：显示面板，所述显示面板包括用于与驱动芯片绑定的信号线；电源模块，用于提供电信号；电位监测模块，用于监测所述信号线的电位，在所述信号