Devices and methods for dimming a display screen

A method for dimming a display screen, comprising:

• acquiring, by a device for dimming the display screen, a parameter value of the display screen to be adjusted, the parameter value having a correspondence with a brightness of the display screen;
• comparing, by the device, the parameter value with a set threshold to obtain a comparison result;
• determining, by the device, a corresponding dimming mode according to the comparison result;
• and
• performing;
• by the device, dimming on the display screen in the corresponding dimming mode,
• wherein the device comprises a pixel driving circuit comprising a first Thin-Film Transistor, a second Thin-Film Transistor, a third Thin-Film Transistor, a capacitor and a pixel;
• wherein signals received by a gate of the first Thin-Film Transistor and a first electrode of the first Thin-Film Transistor correspond to a scanning signal Vscan and a data signal Vdata, respectively;
• wherein signals received by a gate of the third Thin-Film Transistor and a first electrode of the third Thin-Film Transistor correspond to a Vpwm signal and a transmitted signal transmitted from a second electrode of the second Thin-Film Transistor, respectively;
• wherein a second electrode of the third Thin-Film Transistor is connected to the pixel;
• and
• wherein the capacitor is connected between the gate of the second Thin-Film Transistor and a power supply.