A light sensor circuit, comprising: a first transistor having first and second electrodes and a gate electrode; a second transistor having a first electrode connected to the gate electrode of the first transistor and a second electrode connected to the second electrode of the first transistor, the second transistor including a gate electrode connected to receive a first control signal; a third transistor having a first electrode connected to a first reference voltage (V REF1) and a second electrode connected to first electrode of the first transistor, the third transistor including a gate electrode connected to receive a second control signal; a fourth transistor having a first electrode connected to the second electrode of the first transistor and a second electrode connected to a second power source, the fourth transistor including a gate electrode connected to receive an inverted second control signal (CS2b); a light receiving element having an anode connected to a third reference voltage (V REF3); a fifth transistor having a first electrode connected to a second reference voltage (V REF2) and a second electrode connected to a cathode of the light receiving element, the fifth transistor including a gate electrode connected to receive the first control signal; a first capacitor having a first and a second electrode, the second electrode connected to the third reference voltage (V REF3); a sixth transistor having a first electrode connected to the cathode of the light receiving element and a second electrode connected to the first electrode of the first capacitor, the sixth transistor including a gate electrode connected to receive a third control signal; and a second capacitor connected between the gate electrode of the first transistor and the first electrode of the first capacitor. a first transistor having first and second electrodes and a gate electrode; a second transistor having a first electrode connected to the gate electrode of the first transistor and a second electrode connected to the second electrode of the first transistor, the second transistor including a gate electrode connected to receive a first control signal; a third transistor having a first electrode connected to a first reference voltage (V REF1) and a second electrode connected to first electrode of the first transistor, the third transistor including a gate electrode connected to receive a second control signal; a fourth transistor having a first electrode connected to the second electrode of the first transistor and a second electrode connected to a second power source, the fourth transistor including a gate electrode connected to receive an inverted second control signal (CS2b); a light receiving element having an anode connected to a third reference voltage (V REF3); a fifth transistor having a first electrode connected to a second reference voltage (V REF2) and a second electrode connected to a cathode of the light receiving element, the fifth transistor including a gate electrode connected to receive the first control signal; a first capacitor having a first and a second electrode, the second electrode connected to the third reference voltage (V REF3); a sixth transistor having a first electrode connected to the cathode of the light receiving element and a second electrode connected to the first electrode of the first capacitor, the sixth transistor including a gate electrode connected to receive a third control signal; and a second capacitor connected between the gate electrode of the first transistor and the first electrode of the first capacitor.