Method of compensating reference data and touch screen apparatus using the method

A touch screen apparatus comprising:

• a touch screen panel that includes Tx lines, Rx lines, and touch sensors formed on intersection portions where the Tx lines and the Rx lines intersect;
• a touch drive circuit that supplies a drive pulse to the Tx lines, converts voltages received through the Rx lines into digital data, and thus outputs touch raw data;
• and
• a touch algorithm execution unit into which the touch raw data are input from the touch drive circuit,
• wherein the touch algorithm execution unit includes,
• a touch raw data compensation unit that calculates touch compensation data in the n-th frame period by compensating the touch raw data in the n-th frame period using reference data in the (n−1)-th frame period stored in a memory,
• a touch candidate coordinates detection unit that analyzes the touch compensation data in the n-th frame period and thus detects touch candidate coordinates,
• a reference compensation data generation unit that generating reference compensation data in the n-th frame period by setting a labeling block on the touch raw data corresponding to the touch candidate coordinates and by compensating the touch raw data included in the labeling block without compensating the touch raw data not included in the labeling block, and
• a reference data generation unit that generates reference data in the n-th frame period by calculating an average value of the reference compensation data in the n-th frame period, and the reference compensation data in the (n−1)-th to (n−1)-th frame periods, stored in the memory.