Combining Laser and Piezoelectric Touchscreens
Original Publication Date: 1988-Jul-01
Included in the Prior Art Database: 2005-Feb-15
A technique is described whereby two touchscreen technologies, laser and piezoelectric as used in cathode ray tube (CRT) image positioning systems, are combined so as to increase tracking accuracy and function. When used independently, piezoelectric touchscreens are known to have accuracy problems and can only accept discrete touches, not finger tracking motion. Laser touchscreens have the ability to track continuously or to pinpoint and confirm, but not both. The concept described herein provides a means of combining both the piezoelectric and the laser touchscreen technologies, so as to increase the accuracy and functionality of touchscreen applications. First, the piezoelectric touch-sensor is connected to the CRT surface. No attempt is made to resolve the location of the touch, just to register the fact of the touch.