Touch sensing method and apparatus

Details Touch sensing method and apparatus Touch sensing method and apparatus

1996-01-04

1999-07-06

Powell, Mark R.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

345156, 345179, 178 1806, 178 2004, E08C 2100

Patent

active

059203099

ABSTRACT:
Method and apparatus for sensing the simultaneous proximity of one or more fingers or other appropriate objects to a capacitive touch sensor. A modulator/demodulator pair drive and sense either a single trace or a pair of traces. In a dual trace embodiment, differentially sensed signals are then peak detected converted from voltage to current. The output signal is then calibrated to adjust for trace variations, followed by appropriate gain and level shifting, and analog-to-digital conversion for use as the input to a microcontroller.

REFERENCES:
patent: 3886311 (1975-05-01), Rogers et al.
patent: 3921166 (1975-11-01), Volpe
patent: 4103252 (1978-07-01), Bobick
patent: 4455452 (1984-06-01), Schuyler
patent: 4550221 (1985-10-01), Mabusth
patent: 4639720 (1987-01-01), Rympalski et al.
patent: 4686332 (1987-08-01), Greanias et al.
patent: 4733222 (1988-03-01), Evans
patent: 4736191 (1988-04-01), Matzke et al.
patent: 5016008 (1991-05-01), Gruaz et al.
patent: 5648642 (1997-07-01), Miller et al.
patent: 5825351 (1998-10-01), Tam
patent: 5825352 (1998-10-01), Bisset et al.
Synaptics Brochure, "Synaptics Touch Pad," pp. 1-39.

Affiliated with

Also associated with

Rating

Touch sensing method and apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Touch sensing method and apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Touch sensing method and apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-902731