A display controller for a display device, wherein, the display controller includes a display driver, a data storage, a mode trigger, and a mode controller for controlling a display panel to be in a normal display mode or a standby display mode, and a trigger identifier to identify a trigger signal outputted by the mode trigger, the output terminal of the mode trigger is connected with the input terminal of the mode controller to trigger the mode controller for mode selection, the output terminal of the mode controller is connected with the control terminal of a signal switcher and the control terminal of the display driver, respectively, the output terminal of the signal switcher is connected with a normal display signal terminal and a standby display signal terminal connected with the data storage, respectively, and the normal display signal terminal and the standby display signal terminal are connected with the input terminal of the display driver, respectively, to provide a normal display signal and a standby display signal, respectively, the display panel is a touch-typed display panel, the mode trigger includes a touch detector and a preset key, the trigger identifier includes a first logic AND gate operation circuit and a light sensor for detecting external light incident on the display surface of the touch-typed display panel, the output terminal of the light sensor is connected with a first input terminal of the first logic AND gate operation circuit, the output terminal of the touch detector is connected with a second input terminal of the first logic AND gate operation circuit, and the output terminal of the first logic AND gate operation circuit and the preset key are connected with input terminals of the mode controller, respectively, to cause the mode controller to drive the touch-typed display panel for standby display when the touch detector detects touch information and the light sensor detects that the display surface of the touch-typed display panel has external light. the display controller includes a display driver, a data storage, a mode trigger, and a mode controller for controlling a display panel to be in a normal display mode or a standby display mode, and a trigger identifier to identify a trigger signal outputted by the mode trigger, the output terminal of the mode trigger is connected with the input terminal of the mode controller to trigger the mode controller for mode selection, the output terminal of the mode controller is connected with the control terminal of a signal switcher and the control terminal of the display driver, respectively, the output terminal of the signal switcher is connected with a normal display signal terminal and a standby display signal terminal connected with the data storage, respectively, and the normal display signal terminal and the standby display signal terminal are connected with the input terminal of the display driver, respectively, to provide a normal display signal and a standby display signal, respectively, the display panel is a touch-typed display panel, the mode trigger includes a touch detector and a preset key, the trigger identifier includes a first logic AND gate operation circuit and a light sensor for detecting external light incident on the display surface of the touch-typed display panel, the output terminal of the light sensor is connected with a first input terminal of the first logic AND gate operation circuit, the output terminal of the touch detector is connected with a second input terminal of the first logic AND gate operation circuit, and the output terminal of the first logic AND gate operation circuit and the preset key are connected with input terminals of the mode controller, respectively, to cause the mode controller to drive the touch-typed display panel for standby display when the touch detector detects touch information and the light sensor detects that the display surface of the touch-typed display panel has external light.