CRT Touch Panel Automatic Calibration
Original Publication Date: 1986-Jun-01
Included in the Prior Art Database: 2005-Mar-09
The known CRT touch panel technology is modified by the addition of four driven transducers on the front side of the touch panel. They are individually and successively driven to induce output from selected pairs of the usual touch-sensing transducers. The output of each pair is normalized to equality by software. The panel is thus automatically calibrated. Figs. 1 and 2 respectively show front and side views of the present embodiment. It is seen that the usual four pressure-sensitive transducers 1, 2, 3, and 4 are located at the corners behind panel 5 between the panel and frame 6. It is seen that four driven transducers 12, 13, 24, and 34 are located at the exact center of each edge in front of panel 5 between the panel and frame 6. Calibration proceeds as follows.