US 11,816,287 B2
Low electromagnetic interference (EMI) solution for touch products
Khosrov D. Sadeghipour, Cork (IE); and Brendan Lawton, Cork (IE)
Assigned to Cypress Semiconductor Corporation, San Jose, CA (US)
Filed by Cypress Semiconductor Corporation, San Jose, CA (US)
Filed on Sep. 20, 2021, as Appl. No. 17/479,975.
Prior Publication US 2023/0100570 A1, Mar. 30, 2023
Int. Cl. G06F 3/041 (2006.01); G06F 3/044 (2006.01)
CPC G06F 3/0418 (2013.01) [G06F 3/0446 (2019.05); G06F 3/04166 (2019.05)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
generating an in-phase drive signal and an opposite-phase drive signal;
applying, at a substantially same time, the in-phase drive signal to a first transmitter electrode and the opposite-phase drive signal to a second transmitter electrode, wherein the first transmitter electrode and the second transmitter electrode are adjacent electrodes;
receiving a first sense signal from a first receiver electrode;
receiving a second sense signal from a second receiver electrode, wherein the first receiver electrode and the second receiver electrode are adjacent electrodes;
receiving a fourth sense signal from a third receiver electrode, wherein the third receiver electrode and the second receiver electrode are adjacent electrodes;
combining the first sense signal and the second sense signal to and obtain a third sense signal, wherein the third sense signal represents a first self capacitance associated with the first receiver electrode;
combining the second sense signal and the fourth sense signal to obtain a fifth sense signal, wherein the fifth sense signal represents a second self capacitance associated with the second receiver electrode; and
detecting a presence of an object on a touch panel using at least the first self capacitance and the second self capacitance.