An image sensor circuit , comprising: a pixel array , comprising a plurality of pixel series (PXS), wherein a pixel series (PXS) in the plurality of pixel series (PXS) comprises a plurality of pixel circuits (PX_1∼PX_M), the plurality of pixel circuits (PX_1∼PX_M) are used to collect reflected light corresponding to incident light emitted by a light emitting unit and reflected from a target object; and a clock signal generating circuit , coupled to a first end and a second end of the pixel series (PXS); wherein the first end of the pixel series (PXS) is electrically connected to the clock signal generating circuit to receive a first clock signal (CK1) at a first time, and the first clock signal (CK1) is propagated from the first end of the pixel series (PXS) to the second end of the pixel series (PXS), wherein each pixel circuit (PX_1∼PX_M) is used to determine a first time of flight of received reflected light according to the received first clock signal (CK1); wherein the second end of the pixel series (PXS) is electrically connected to the clock signal generating circuit to receive a second clock signal (CK2) at a second time, and the second clock signal (CK2) is propagated from the second end of the pixel series (PXS) to the first end of the pixel series (PXS), wherein each pixel circuit (PX_1∼PX_M) is used to determine a second time of flight of received reflected light according to the received second clock signal; and wherein the first end of the pixel series is electrically disconnected from the clock signal generating circuit at the second time and the second end of the pixel series is electrically disconnected from the clock signal generating circuit at the first time. a pixel array , comprising a plurality of pixel series (PXS), wherein a pixel series (PXS) in the plurality of pixel series (PXS) comprises a plurality of pixel circuits (PX_1∼PX_M), the plurality of pixel circuits (PX_1∼PX_M) are used to collect reflected light corresponding to incident light emitted by a light emitting unit and reflected from a target object; and a clock signal generating circuit , coupled to a first end and a second end of the pixel series (PXS); wherein the first end of the pixel series (PXS) is electrically connected to the clock signal generating circuit to receive a first clock signal (CK1) at a first time, and the first clock signal (CK1) is propagated from the first end of the pixel series (PXS) to the second end of the pixel series (PXS), wherein each pixel circuit (PX_1∼PX_M) is used to determine a first time of flight of received reflected light according to the received first clock signal (CK1); wherein the second end of the pixel series (PXS) is electrically connected to the clock signal generating circuit to receive a second clock signal (CK2) at a second time, and the second clock signal (CK2) is propagated from the second end of the pixel series (PXS) to the first end of the pixel series (PXS), wherein each pixel circuit (PX_1∼PX_M) is used to determine a second time of flight of received reflected light according to the received second clock signal; and wherein the first end of the pixel series is electrically disconnected from the clock signal generating circuit at the second time and the second end of the pixel series is electrically disconnected from the clock signal generating circuit at the first time. <EOS>