Touch Screen Detecting Method and Apparatus

A method for detecting touch points on a touch panel, the method comprising:

• receiving the acoustic waves generated from the touch points by wave receptors disposed at three predetermined points;
• detecting times the acoustic waves reach the wave receptors, respectively;
• calculating distances between the touch points and the three predetermined points according to the times the acoustic waves reach the wave receptors;
• and
• calculating coordinates of each of the touch points by geometry operation according to the distances between each of the touch points and the three predetermined points.

An apparatus comprising:

• a touch panel;
• wave receptors configured to receive acoustic wave signals generated from a touch point on a surface of the touch panel and convert the acoustic wave signals into electric signals, each of the receptors being disposed at a predetermined point on the touch panel;
• a control device comprising:
• a calculating unit configured to calculate distances between the touch point and each of the wave receptors according to the electric signals;
• and
• a location determining unit configured to construct at least three circle equations which respectively employ the location of the wave receptors as their centers and the distances between the touch point and each of the wave receptors as their radiuses, and determining the coordinates of the touch points according to the solution of the at least three circle equations by geometry operation.