Pixel, pixel array, image sensor including the same and method for operating the image sensor

A pixel comprising:

• a first photo-electro conversion unit;
• a second photo-electro conversion unit;
• a capacitor for storing charges converted by the first and second photo-electro conversion units;
• an output switching device connected to a power supply line to output an electric potential of the capacitor;
• a first removal unit for discharging a part of the charges converted by the first photo-electro conversion unit to the power supply line;
• and
• a second removal unit for discharging a part of the charges converted by the second photo-electro conversion unit to the power supply line.