Image sensor circuit and image depth sensor system

An image depth sensor system, comprising:

• a light emitting unit, configured to emit incident light;
• and
• an image sensor circuit, comprising:
• a photo pixel array, comprising a plurality of photo pixel series, wherein a photo pixel series in the plurality of photo pixel series comprises a plurality of photo pixel circuits, a first end of the photo pixel series is configured to receive a clock signal, which is propagated from the first end of the photo pixel series to a second end of the photo pixel series, and the photo pixel array is configured to output a plurality of pixel values;
• a reference pixel array, comprising at least one reference pixel series, wherein the reference pixel series comprises a plurality of reference pixel circuits, a first end of the reference pixel series is configured to receive the clock signal, which is propagated from the first end of the reference pixel series to a second end of the reference pixel series, and the reference pixel array is configured to output a plurality of phase differences between a plurality of received clock signals received by the plurality of reference pixel circuits and the clock signal;
• and
• an image depth determining unit, coupled to the photo pixel array and the reference pixel array, and configured to determine an image depth according to the plurality of pixel values and the plurality of phase differences.