Pixel compensation circuit, method for compensating pixel driving circuit, and display device

A pixel compensation circuit configured to provide a comprehensive compensation signal to a pixel driving circuit, the pixel driving circuit comprising a drive transistor connected to a first electrode of an electroluminescent element, and the pixel compensation circuit comprising:

• an external electrical compensation sub-circuit, configured to sense, in a light emitting phase of the pixel driving circuit, an electric signal of the first electrode of the electroluminescent element;
• an external optical compensation sub-circuit, configured to sense, in the light emitting phase of the pixel driving circuit, a brightness signal of the electroluminescent element by a photosensitive sensor;
• and
• a processor configured to:
• calculate an electrical compensation signal according to the electric signal;
• calculate an optical compensation signal according to the brightness signal;
• generate a compensative compensation signal according to the electrical compensation signal and the optical compensation signal;
• and
• control a signal on a control terminal of the drive transistor according to the comprehensive compensation signal.