Pixel driving circuit having reduced number of contacts

A pixel driving circuit comprising:

• a pixel internal memory comprising a plurality of memory cells configured to store a setting value related to stored data comprising pixel driving data and video data;
• a signal detection circuit comprising a row signal input terminal and a column signal input terminal;
• a first low-pass filter configured to output a first signal, which has a first frequency lower than a preset first cutoff frequency, from a signal output from the signal detection circuit;
• and
• a second low-pass filter configured to output a second signal, which has a second frequency lower than a preset second cutoff frequency, from the signal output from the signal detection circuit to the pixel internal memory,
• wherein the pixel internal memory comprises:
• a single flag memory cell configured to store a mode value;
• a setting data shift register having a plurality of setting memory cells configured to store the setting value related to pixel driving;
• and
• K video data shift registers corresponding to a number of light-emitting elements configured to store the video data.