US 12,189,900 B2
Touch detection system and touch detection method for determining whether a touch event is triggered by a stylus
Fong-Wei Yang, Tainan (TW); Min-Chi Kao, Tainan (TW); Chung-Wen Chang, Tainan (TW); Ming-Kai Cheng, Tainan (TW); Tzu-Hsi Yang, Tainan (TW); and Wen-Sen Su, Tainan (TW)
Assigned to HIMAX TECHNOLOGIES LIMITED, Tainan (TW)
Filed by HIMAX TECHNOLOGIES LIMITED, Tainan (TW)
Filed on Apr. 6, 2023, as Appl. No. 18/131,851.
Prior Publication US 2024/0338098 A1, Oct. 10, 2024
Int. Cl. G06F 3/03 (2006.01); G06F 3/0354 (2013.01); G06F 3/041 (2006.01)
CPC G06F 3/04186 (2019.05) [G06F 3/03545 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A touch detection system comprising:
a stylus comprising a pen-tip portion and a pen-ring portion;
a panel comprising a plurality of sensing cells configured to receive a first signal and a second signal generated by a touch event; and
a processing circuit coupled to the panel and configured to determine a plurality of first areas and a plurality of first intensities corresponding to the first signal, determine a plurality of second areas and a plurality of second intensities corresponding to a second signal, and determine whether the touch event is triggered by the stylus touching the panel according to the first intensities, first areas, the second intensities and the second areas;
wherein:
the first signal is generated from the pen-tip portion, and the second signal is generated from the pen-ring portion;
a first maximum of the first intensities is corresponding to a first selected area of the first areas;
a second maximum of the second intensities is corresponding to a second selected area of the second areas;
the processing circuit determines the stylus does not touch the panel when
(i) a distance between the first selected area and the second selected area is smaller than a first threshold, and
(ii) an absolute difference between the first maximum of the first intensities and the second maximum of the second intensities is smaller than a second threshold;
where the first threshold is within four sensing cells, and the second threshold is between 8% and 12% of the first maximum of the first intensities.