Pixel unit, display substrate and driving method thereof, and display apparatus

A driving method of a display substrate, wherein each display frame of the display substrate includes a data signal setting phase and a display phase, a data signal includes a current signal and pulse width modulation signals;

• the display substrate includes a plurality of pixel units and a control chip, and each pixel unit in the plurality of pixel units includes N light-emitting devices;
• the driving method comprises:
• in the data signal setting phase:
• receiving, by the control chip, an image signal of an i-th frame, wherein the image signal of the i-th frame includes an initial current signal and an initial pulse width modulation signal that are corresponding to the N light-emitting devices of each pixel unit in the plurality of pixel units in a current frame of image;
• the initial current signal includes N initial current sub-signals, and the initial pulse width modulation signal includes N initial pulse width modulation sub-signals with a same number of bits;
• processing, by the control chip, the initial current signal to generate the current signal, the current signal including an initial current sub-signal with a largest current amplitude in the N initial current sub-signals;
• and
• processing, by the control chip, the initial pulse width modulation signal to generate the pulse width modulation signals, the pulse width modulation signals including N pulse width modulation sub-signals with different number of effective bits, wherein
• i is a positive integer greater than or equal to 1, and N is a positive integer greater than 1;
• and
• in the display phase:
• emitting light by the N light-emitting devices of each pixel unit in the plurality of pixel units according to the current signal and the pulse width modulation signals.