Abstract
An image sensor including a pixel array is provided. The pixel array includes R x S sub-pixel arrays. The sub-pixel array includes P x Q pixels. Each pixel includes a photodiode, a first transistor, a second transistor, a third transistor, a fourth transistor, and a fifth transistor. The gate electrode of the second transistor couples to a row control signal. The second source/drain electrode of the second transistor couples to a column control signal. The gate electrode of the third transistor couples to a reset signal. The second source/drain electrode of the third transistor couples to a column voltage reset signal. The gate electrode of the fifth transistor couples to a row select signal. The sub-pixel array uses the row control signal, the column control signal, the column voltage reset signal, and the row select signal to select one of the pixels' sensing signal as the output.