A pixel circuit of a time-of-flight sensor, comprising pixel cells having A rows and B columns, wherein a pixel cell in an Mth row and an Nth column comprises:
- a photoelectric conversion element configured to receive a modulated light wave to generate a charge;
- wherein the modulated light wave is transmitted by a transmission circuit of a light source and is reflected by a target object to the photoelectric conversion element;
- a first charge storage and transfer circuit connected with the photoelectric conversion element and configured to selectively modulate a charge corresponding to a first phase of the modulated light wave to generate a first integrated charge signal according to a first charge modulation signal, and output the first integrated charge signal according to a first control signal;
- a second charge storage and transfer circuit connected with the photoelectric conversion element and configured to selectively modulate a charge corresponding to a second phase of the modulated light wave to generate a second integrated charge signal according to a second charge modulation signal, and output the second integrated charge signal according to a second control signal;
- a third charge storage and transfer circuit connected with the photoelectric conversion element and configured to selectively modulate a charge corresponding to a third phase of the modulated light wave to generate a third integrated charge signal according to a third charge modulation signal, and output the third integrated charge signal according to a third control signal;
- a fourth charge storage and transfer circuit connected with the photoelectric conversion element and configured to selectively modulate a charge corresponding to a fourth phase of the modulated light wave to generate a fourth integrated charge signal according to a fourth charge modulation signal, and output the fourth integrated charge signal according to a fourth control signal;
- a charge readout circuit commonly connected with an output of the third charge storage and transfer circuit and an output of the second charge storage and transfer circuit, and configured to output a third photoelectric signal to obtain a third calculation signal according to the third integrated charge signal, and output a second photoelectric signal to obtain a second calculation signal according to the second integrated charge signal;
- wherein the charge readout circuit of the pixel cell in the Mth row and the Nth column is further commonly connected with an output of a first charge storage and transfer circuit of a pixel cell in an Mth row and a (N+1)th column and an output of a fourth charge storage and transfer circuit of a pixel cell in an Mth row and a (N+1)th column, and the charge readout circuit of the pixel cell in the Mth row and the Nth column is configured to output a first photoelectric signal of the pixel cell in the Mth row and the (N+1)th column to obtain a first calculation signal of the pixel cell in the Mth row and the (N+1)th column according to a first integrated charge signal output by the pixel cell in the Mth row and the (N+1)th column, and the charge readout circuit of the pixel cell in the Mth row and the Nth column is configured to output a fourth photoelectric signal of the pixel cell in the Mth row and the (N+1)th column to obtain a fourth calculation signal of the pixel cell in the Mth row and the (N+1)th column according to a fourth integrated charge signal output by the pixel cell in the Mth row and the (N+1)th column;
- wherein a time of flight of light is obtained based on the first calculation signal, the second calculation signal, the third calculation signal and the fourth calculation signal corresponding to each of the pixel cells;
- both A and B are natural numbers, M is a natural number less than or equal to A, and N is a natural number less than B.