Patent ID: 8749537

Claim:
A photo sensor, comprising: a photo sensing unit generating a first electrical current corresponding to an ambient light and a second electrical current corresponding to an ambient temperature; a temperature compensating unit comprising a dark diode generating a third electrical current having a same magnitude as the second electrical current, with the second electrical current having an amplitude that varies according to the ambient temperature surrounding the dark diode by blocking of light to be impingent on the dark diode; and a buffer unit outputting a light sensing signal corresponding to a fourth electrical current having the same magnitude as the first current by subtracting the third current generated at the temperature compensating unit from a sum of the first and second currents generated at the photo sensing unit, in which, in the photo sensing unit, a cathode electrode of the photodiode is connected with a voltage of a driving power supply and an anode electrode of the photodiode is connected with a voltage of an initialization power supply; and in the temperature compensating unit, an anode electrode of the dark diode is connected with the voltage of the initialization power supply and a cathode electrode of the dark diode is connected with the voltage of the driving power supply.