Adaptive thresholding scheme for optically-based touch screens

Details Adaptive thresholding scheme for optically-based touch screens Adaptive thresholding scheme for optically-based touch screens

G - Physics

06

K

328/173, 375/22

G06K 11/06 (2006.01) G06F 3/033 (2006.01)

Patent

CA 1248598

- 21 - ABSTRACT OF THE DISCLOSURE The sensitivity of an optically-based touch screen is substantially improved by adaptively establishing the detection threshold based on the peak trapped light measured over a number of frames on the screen being painted. In accordance with one feature of the invention, the peak trapped light from a target area painted on the screen is compared with a priorly established therehold as a way of determining that a target area is being touched by the user. In accordance with another feature of the invention, the threshold is modified in a way that compensates for possible erroneous touch indication due, for example, to bright spots on the screen.

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