Patent ID: 6917350

Claim:
A driving circuit of an active matrix method in a display device comprising: a first switch connected to data and scan lines to switch an externally applied control voltage; a driving unit storing the control voltage by switching of the first switch, and making the display device emit lights by the stored control voltage; a second switch switching a current applied to the display device by the control voltage applied from the driving unit; and a deviation compensator detecting the current applied to the display device by switching of the second switch, and controlling the control voltage, thereby compensating luminance deviation of the display device according to deviation of the threshold voltages of the driving units, wherein the deviation compensator comprises: a converter converting the current applied to the display device to a voltage, a comparator comparing the voltage value converted by the converter with a reference voltage value, and a sample & hold circuit (S & H circuit) receiving an external ramp voltage, and outputting a certain ramp voltage to the data line according to result of the comparator.