Touch screen is the absolute coordinate system

Touch screen is the absolute coordinate system, which directly points to select and mouse-the essential difference between this relative positioning system is a place of intuition. Absolute coordinate system of features is each a times positioning coordinates and Shang once positioning coordinates no relationship, touch screen in physical Shang is a independent of coordinates positioning system, each touch of data through calibration data to screen Shang of coordinates, such, on requirements touch screen this sets coordinates regardless of in what situation Xia, with is of output data is stable of, if not stable, so this touch screen on cannot guarantee absolute coordinates positioning, points no, this is touch screen most fear of problem: drift. On technology cannot guarantee with a little touch of each sampled the same touch screen, there is drift this issue, there is drift only capacitive touch screen.