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:
Aug. 17, 2021
Filed:
Jun. 03, 2019
Cambridge Touch Technologies Ltd., Cambridge, GB;
Mojtaba Bagheri, Cambridge, GB;
Babak Bastani, Royston, GB;
Jiahao Li, Cambridge, GB;
Xiang Cheng, Cambridge, GB;
Michael Astley, Cambridge, GB;
Cambridge Touch Technologies Ltd., Cambridge, GB;
Abstract
A device () for processing signals from a projected capacitance touch panel () is described. The projected capacitance touch panel () includes a layer of piezoelectric material () disposed between a number of sensing electrodes () and at least one counter electrode (). The device () includes a capacitive touch controller () having a number of measurement ports (). The device () also includes a number of charge amplifiers (). The device () also includes a number of terminals (C, . . . , C, D, . . . , D) for connection to the sensing electrodes () of the projected capacitance touch panel (). Each terminal (C, . . . , C, D, . . . , D) is connected to one of the measurement ports (). Each terminal (C, . . . , C, D, . . . , D) is also connected to an input of one of the charge amplifiers () via a corresponding switch (SW) of a number of switches (). The device () also includes a controller () configured to synchronise the capacitive touch controller () and the number of switches (SW,) so that during a first portion ([t, t]) of a cycle the capacitive touch controller () outputs a capacitance measurement signal () to one or more of the terminals (C, . . . , C, D, . . . , D), and the plurality of charge amplifiers () are disconnected from the terminals (C, . . . , C, D, . . . , D) by the respective switches (SW,). The controller () is also configured to synchronise the capacitive touch controller () and the number of switches (SW,) so that during a second portion ([t, t]) of the cycle the capacitive touch controller () does not output the capacitance measurement signal (), and one or more of the charge amplifiers () are connected to the corresponding terminals (C, . . . , C, D, . . . , D) by the respective switches (SW,).