A pixel driving circuit is provided, and the pixel driving circuit includes a light-emitting driving circuit, a photosensitive driving circuit, a micro light-emitting diode, and a photoelectric conversion device, wherein when the pixel driving circuit is in a display mode, the light-emitting driving circuit drives the micro light-emitting diode to emit light for display, and when the pixel drive circuit is in a photosensitive display mode, the photosensitive driving circuit drives the photoelectric conversion device to generate a photocurrent, and when the photocurrent is received by the micro light-emitting diode, the micro light-emitting diode will emit light for display. Functions of electronic devices may be integrated into a display panel to achieve full-screen display.