Voltage control circuit, display device and voltage control method

The invention provides a voltage control circuit, a display device and a voltage control method, when the current voltage of a vehicle power supply is greater than a preset voltage threshold value, a backlight voltage signal is firstly received through a first voltage control unit, and when a preset time is continued, a conduction signal is sent to a second voltage control unit; then the display voltage signal is received through the second voltage control unit based on the conduction signal, and the display voltage signal is received after the backlight voltage signal, so that the display device driven by the display voltage signal starts to work under the condition that the backlight control signal for driving the backlight control device is firstly stable, and at the moment, the display device is driven by the display voltage signal. The display device generates the display signal based on the display voltage signal and issues the display signal to the backlight control device, so that the backlight control device does not miss the display signal due to starting of driving after the display device works, logic control failure is avoided, and normal backlight lighting is guaranteed.