US 10,890,989 B1
Touch pad driving device and touch driving method
Yi-Chung Chou, Taipei (TW); Chih-Yuan Kuo, New Taipei (TW); and Ta-Wei Liu, Hsinchu (TW)
Assigned to ITE Tech. Inc., Hsinchu (TW)
Filed by Yi-Chung Chou, Taipei (TW); Chih-Yuan Kuo, New Taipei (TW); and Ta-Wei Liu, Hsinchu (TW)
Filed on Oct. 7, 2019, as Appl. No. 16/595,442.
Claims priority of application No. 108124883 A (TW), filed on Jul. 15, 2019.
Int. Cl. G06F 3/0354 (2013.01); G06F 3/041 (2006.01)
CPC G06F 3/03547 (2013.01) [G06F 3/0416 (2013.01); G06F 2203/04107 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A touch pad driving device, configured to drive a touch pad for a self-capacitance touch sensing, wherein a plurality of sensing channels of the touch pad are arranged in a two-dimensional mode, and the touch pad driving device comprises:
a channel selection unit, coupled to the sensing channels; and
a controller, coupled to the channel selection unit and configured to control the channel selection unit to scan the sensing channels, cause one selected sensing channel in the sensing channels receive a touch driving signal through the channel selection unit, cause all of sensing channels adjacent to or around the selected sensing channel in the sensing channels receive a shielding signal through the channel selection unit according to position information, and cause all of remaining sensing channels in the sensing channels receive a reference signal through the channel selection unit according to the position information, wherein the reference signal is different from the touch driving signal and the shielding signal,
wherein the controller obtains the position information through a shielding table corresponding to a layout of the sensing channels, wherein the shielding table comprises a first flag for representing the shielding signal and a second flag for representing the reference signal, wherein the controller obtains the position information according to the first flag and the second flag.