The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 07, 2025
Filed:
Sep. 25, 2021
Apple Inc., Cupertino, CA (US);
Andrew William Shorten, San Jose, CA (US);
Sai Zhang, Santa Clara, CA (US);
Andreas Johannes Koeberl, San Francisco, CA (US);
Eric S. Winokur, San Francisco, CA (US);
Liqun Yang, Shanghai, CN;
Sabino Joseph Pietrangelo, II, Mountain View, CA (US);
Branislav Jovanovic, San Francisco, CA (US);
Ari Y. Benbasat, San Jose, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
Techniques for rejecting apparent (but false) touches caused by objects such as water droplets located in areas with parasitic capacitive paths to ground are disclosed. To minimize these false touches, one or more guard conductors can be located in proximity to the housing and driven with a stimulation signal to shield objects from being capacitively coupled to ground through the housing. In some examples images of touch can be obtained from a non-bootstrapped or bootstrapped scan and also an extended bootstrapped scan wherein the guard conductor is driven with a stimulation signal that has the same characteristics as the stimulation signal being applied to the sensed touch nodes. In some examples, the results of the extended bootstrapped scan can be subtracted from the non-bootstrapped or bootstrapped scan to identify and reject apparent touches resulting from capacitive coupling to ground.