Reduced noise touch screen apparatus and method

Details Reduced noise touch screen apparatus and method Reduced noise touch screen apparatus and method

G - Physics

06

K

G06K 11/00 (2006.01) G06F 3/033 (2006.01) G08C 21/00 (2006.01) H01J 9/14 (2006.01) H01J 29/00 (2006.01) H01J 29/86 (2006.01)

Patent

CA 2154648

A touch screen having a high or fine resolution at relatively low cost is provided. In one embodiment, electrodes are placed directly on the surface of a CRT screen without the need for an electrode positioned on the rear surface. The touch screen may include a conductive coating and protective coating which are preferably provided in a single vacuum chamber step. A high gain system including a high-frequency sampling bandpass filter provide discrimination of the desired signal over noise. A screen calibration technique is used to achieve linearization in order to convert the electric signals obtained from the screen into data indicative of the position of a touch on the screen.

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