<p>A driving method of the touch screen calculating the coordinate of the high precision is provided to improve control about the touch screen of various kind and the manipulation reliability containing the optical mode touch screen applied to the small apparatus as calculating the coordinate of the high precision. A driving method of the touch screen calculating the coordinate of the high precision includes the steps of: the fast scan process which sensor pairs consisting of the emitting device installed at x-axis and the light receiving element installed at the y-axis corresponded to it are turned on by successively, and which detects the touched location to the coordinate using the x-axis and the y-axis(S1); the high resolution image detection procedure which measures the analog amperage rescaning adjacent sensor pairs of the touched location as described above and changes the measured analog measurement value to the digital data value(S2); the final coordinate calculation process which transmits final data with the signal drive part after calculating the coordinate of optimum in data value calculated from the high resolution image detection procedure(S3).</p>
