An apparatus and method is disclosed for repairing and removing scratches from an optically-read disc, e. A scanning line is formed on a different layer from a gate electrode and the capacitor wiring is arranged so as to be parallel with a signal line. The power monitoring module outputs the rail voltage to correspond to a fractional duty cycle of the source voltage when the source voltage is greater than a designated voltage. The reinforcing plates-heat dissipaters 17 and 18 are formed with a plurality of air vents 17a and 18a. Stress relaxation portions are provided at the overlapping portions. The final depth values for a zone can thus be discarded after each zone is rendering.