Display substrate, display device and driving method thereof

A method for driving a display device, the display device comprising a second base substrate and a display substrate;

• the display substrate comprising:
• a plurality of pixel regions, a plurality of non-pixel regions and a plurality of optical sensing units;
• each of the plurality of non-pixel regions being located between adjacent pixel regions;
• the plurality of optical sensing units being located in the plurality of non-pixel regions;
• each of the plurality of optical sensing units being configured to receive light and output a sensing signal;
• the second base substrate being disposed opposite to the display substrate;
• a plurality of mutually insulated display electrodes being further provided on a side of the second base substrate close to the display substrate;
• the method comprising:
• receiving the sensing signal outputted by the optical sensing unit;
• adjusting a first driving signal, to be inputted into the display electrode of the pixel region to which the optical sensing unit outputting the sensing signal belongs, into a second driving signal according to the sensing signal;
• and
• inputting the second driving signal to the display electrode.