US 12,229,370 B2
System and method for display synchronization
Pengcheng Wen, Beijing (CN); and Yuan Yun Wang, New Taipei (TW)
Assigned to STMICROELECTRONICS LTD., Kowloon (HK); and STMICROELECTRONICS (BEIJING) R&D CO., LTD, Beijing (CN)
Filed by STMICROELECTRONICS (BEIJING) R&D CO., LTD, Beijing (CN); and STMICROELECTRONICS LTD, Kowloon (HK)
Filed on Aug. 31, 2023, as Appl. No. 18/459,249.
Application 18/459,249 is a division of application No. 17/859,784, filed on Jul. 7, 2022, granted, now 11,775,117.
Prior Publication US 2024/0012518 A1, Jan. 11, 2024
Int. Cl. G06F 3/041 (2006.01); G06F 3/044 (2006.01); G09G 3/3233 (2016.01)
CPC G06F 3/04184 (2019.05) [G06F 3/04166 (2019.05); G06F 3/0443 (2019.05); G09G 3/3233 (2013.01); G09G 2320/0247 (2013.01); G09G 2330/023 (2013.01); G09G 2354/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of operating a touchscreen, the method comprising:
performing a first synchronized touch scan pattern with a controller coupled to a display, the controller comprising a first processing chip, the first synchronized touch scan pattern being scheduled to avoid touch scans coinciding with refreshes of the display performed at a first display refresh rate, wherein a display controller provides synchronization pulses to the controller while performing at the first display refresh rate, the display controller comprising a second processing chip, the synchronization pulses being separated by a first interval;
upon detecting a pair of synchronization pulses being separated by a second interval, the second interval being different from the first interval, obtaining a second display refresh rate from the second interval; and
performing a second synchronized touch scan pattern with the controller coupled to the display, the second synchronized touch scan pattern being scheduled to avoid touch scans coinciding with refreshes of the display performed at the second display refresh rate.