MULTIPLE POINTS TOUCH POSITIONING METHOD

摘要

A multiple points touch positioning method for a touch screen system, comprising the following steps: a?measuring a touch signal, judging a change instance of the signal, calculating a position coordinate occurred a touch event and/or a shape size of a touch point; b?according to the change instance of a position coordinate number, judging whether the touch information is a single point touch or a multiple points touch, if it is the single point touch, then the touch screen system accordingly performing every operation of the single point touch, if it is the multiple points touch, then the method turns into the step c; c?comparing the change of the position coordinate number and/or the change of the coordinate value detected in the present calculating period and the previous calculating period, judging whether there is a new touch point added or not or whether there is a touch point leaving or not, if there is a new touch point added, registering the new touch point information, recording the position coordinate of the new touch point, if there is a touch point leaving, then logouts the leaved touch point information.