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:
Jun. 23, 2020
Filed:
Apr. 27, 2018
Cambridge Touch Technologies Ltd., Cambridge, GB;
Silviu Toma, Craiova, RO;
Babak Bastani, Royston, GB;
Cambridge Touch Technologies Ltd., Cambridge, GB;
Abstract
A touchscreen system for generating localised haptic excitations includes a touchscreen panel for measuring force and/or capacitance. The touchscreen system includes one or more first piezoelectric transducers arranged to generate excitations in the touchscreen panel along a first line. The touchscreen system includes one or more second piezoelectric transducers arranged to generate excitations in the touchscreen panel along a second line which is inclined to the first line at an angle. The touchscreen system includes a pressure and/or capacitance sensing module connected to the touchscreen panel and configured to measure a force and/or capacitance from the touchscreen panel. The touchscreen system includes a haptic driving module connected to the first and second piezoelectric transducers and configured to generate user perceptible haptic excitation by driving the first piezoelectric transducers at a first frequency, and driving the second piezoelectric transducers at a second frequency, wherein the difference of the first and second frequencies is a beating frequency, and the beating frequency is a frequency perceptible by human skin, or by driving the first and second piezoelectric transducers at a carrier frequency which is modulated at a modulation frequency which is a frequency perceptible by human skin. The angle is selected to cause Moiré fringes between excitations generated along the first line and the second line.