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:
Dec. 13, 2022
Filed:
Sep. 24, 2021
Apple Inc., Cupertino, CA (US);
Daniel Jacob Benjamin Bechstein, Mountain View, CA (US);
Ullas Chandra Sekhar Pazhayaveetil, Campbell, CA (US);
Jason Chueh-Ren Hu, Palo Alto, CA (US);
Robert Ubo Liu, Santa Clara, CA (US);
Rexford J. Garland, Kansas City, MO (US);
John Stephen Smith, San Jose, CA (US);
Blake R. Marshall, San Jose, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
An input device such as a stylus for providing input to a touch-sensitive surface with reduced sensitivity to leakage current variations over temperature is disclosed. A passive stylus may include one or more diodes in parallel with one or more bleed resistors. The non-linear load of the diode and resistor network can be operative to provide a stylus electric field in response to a stimulation signal from an electronic device that can be capacitively coupled to, and sensed by, the electronic device. The signal sensed by the electronic device can be a function of the total leakage current, which can vary greatly as a function of temperature and frequency. In order to improve performance, the diode and resistor network, including the bleed resistor(s) and diodes within that network, can be selected and/or designed to provide a reduced variation in the leakage current and more accurate stylus detection.