LIGHT SENSING CIRCUIT, TOUCH PANEL INCLUDING THE SAME AND METHOD OF DRIVING THE OPTICAL SENSING CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a light sensing circuit, a touch panel including the same, and a method of driving the optical sensing circuit.SOLUTION: The light sensing circuit includes: a photodiode including a cathode electrode and an anode electrode and for receiving light from the outside and generating a current corresponding to the received light; a driving transistor for amplifying the current generated in the photodiode; a capacitor for storing a data signal of voltage level transmitted to the driving transistor; a first switching transistor for compensating for a threshold voltage of the driving transistor corresponding to a current scan signal; and a second switching transistor for transmitting the data signal of voltage level corresponding to the current scan signal. According to this, the deviation of threshold voltage of the driving transistor can be compensated to achieve accurate light sensing.