Pixel collection circuit and image sensor

A pixel collection circuit, comprising:

• a movement detection module configured to detect a change in a light intensity in a field of view, and generate a pixel triggering signal when the change in the light intensity exceeds a predetermined threshold so as to indicate the pixel collection circuit to be in a triggered state;
• and
• a time signal generation module coupled to the movement detection module and configured to generate a time signal upon the receipt of the pixel triggering signal, the time signal being used to represent time information about a time point at which the pixel collection circuit is triggered,
• wherein the movement detection module and the time signal generation module are coupled to a peripheral reading unit, so that the reading unit scans the pixel collection circuit to output the time information about the pixel collection circuit,
• the time signal generation module comprises:
• a first switch, a first end of which is coupled to a fixed voltage, and a second end of which is coupled to a first end of a first buffer;
• a first capacitor and a first resistor connected in parallel to each other, one end of each of the first capacitor and the first resistor being grounded, and the other end of each of the first capacitor and the first resistor being coupled to the second end of the first switch and the first end of the first buffer;
• the first buffer, a second end of which is coupled to the first end of a second switch;
• and the second switch, a second end of which is coupled to a time signal column output line,
• wherein the first switch or a third switch is controlled by the pixel triggering signal from the movement detection module, and when the pixel triggering signal is active, the first switch or the third switch is turned on;
• and the second switch or a fourth switch is controlled by a time signal row selection signal from the reading unit, and when the time signal row selection signal is active, the second switch or the fourth switch is turned on.