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

1985-03-25

1987-11-17

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340712, 178 18, 250214B, G09G 116

Patent

active

047076895

ABSTRACT:
The sensitivity of an optically-based touch screen is substantially impro 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 threshold 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 indications due, for example, to bright spots on the screen.

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