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

摘要

PURPOSE: A light sensing circuit, a touch panel comprising the same, and a driving method of the light sensing circuit are provided to accurately judge the brightness of light incident to the photo diode by removing current components generated by the peripheral temperature. CONSTITUTION: A photo diode(D1) includes anode and cathode electrodes, and generates current by receiving light from the outside. An amplification unit(10) amplifies the current generated from the photo diode, and a voltage compensating unit(20) adjusts the electric potential of the cathode electrode of the photo diode according to the peripheral temperature. The voltage compensating unit comprises a dark diode(D2) in which light is blocked from the outside, a voltage generating unit(21) outputting compensating voltage according to the current generated from the dark diode, and a capacitor(C1).