Touch and proximity sensor control systems and methods with...

Details Touch and proximity sensor control systems and methods with... Touch and proximity sensor control systems and methods with...

2006-02-14

2006-02-14

Chang, Kent (Department: 2675)

Telegraphy

Systems

Position coordinate determination for writing

C345S178000, C345S173000

Reexamination Certificate

active

06998545

ABSTRACT:
The present invention discloses a novel new technique for detecting an intended activation of a touch sensor in the presence of noise. An algorithm is described that compares a cumulative deviation of a touch sensor reading to a scale to obtain a ratio expressed as a percentage. The percentage is compared against a target threshold and the period required to reach the threshold is examined to determine whether the rise or fall in touch sensor readings is attributable to a touch or to system noise. Additional disclosed embodiments describe circuits configured to operate in a noisy environment and have touch sensors arranged as arrays that are capable of detecting a direction and speed of a human-like contact.

REFERENCES:
patent: 5796183 (1998-08-01), Hourmand
patent: 6380931 (2002-04-01), Gillespie et al.
patent: 2004/0196269 (2004-10-01), Dotson

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