US 11,941,205 B2
Display system, control device, and control method that apply a touch drive signal including a harmonic to common electrodes
Takashi Hatano, Kanagawa (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed on Sep. 22, 2022, as Appl. No. 17/950,672.
Application 17/950,672 is a continuation of application No. PCT/JP2020/044534, filed on Nov. 30, 2020.
Claims priority of application No. 2020-057385 (JP), filed on Mar. 27, 2020.
Prior Publication US 2023/0010276 A1, Jan. 12, 2023
Int. Cl. G06F 3/041 (2006.01); G06F 3/044 (2006.01)
CPC G06F 3/041662 (2019.05) [G06F 3/0412 (2013.01); G06F 3/04164 (2019.05); G06F 3/0446 (2019.05)] 6 Claims
OG exemplary drawing
 
1. A control method adapted to control a display device, the display device comprising a plurality of common electrodes, the plurality of common electrodes being commonly used for image display and touch detection, the control method comprising:
generating a touch drive signal by superimposing a fundamental wave and one or more odd-order harmonics having frequencies lower than a predetermined frequency range that includes a designated frequency on one another;
supplying the touch drive signal to each of the plurality of common electrodes; and
detecting a touch by an object on the display device based on a detection signal received from each of the plurality of common electrodes, wherein
the touch drive signal includes a harmonic having a frequency different from the designated frequency and does not include a harmonic having the designated frequency.