US 9,811,206 B2
Touch sensing method, touch display apparatus and portable electronic device
Chien-Ju Lee, Taoyuan (TW); Yen-Lin Pan, Kaohsiung (TW); Yi-Chuan Lu, Kinmen County (TW); and Heng-Yin Chen, Hsinchu County (TW)
Assigned to Industrial Technology Research Institute, Hsinchu (TW)
Filed by Industrial Technology Research Institute, Hsinchu (TW)
Filed on Oct. 13, 2015, as Appl. No. 14/881,159.
Claims priority of provisional application 62/066,381, filed on Oct. 21, 2014.
Claims priority of application No. 104121264 A (TW), filed on Jun. 30, 2015.
Prior Publication US 2016/0110020 A1, Apr. 21, 2016
Int. Cl. G06F 3/041 (2006.01); G06F 3/044 (2006.01)
CPC G06F 3/0418 (2013.01) [G06F 3/044 (2013.01); G06F 3/0412 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A touch sensing method, adapted to a touch display apparatus, wherein the touch display apparatus comprises a display panel and a touch panel, the display panel comprises an electrode layer, and the touch panel comprises a driving electrode layer, the touch sensing method comprising:
applying a voltage to the driving electrode layer;
setting a system parameter to determine whether an induction event is occurred, if not, obtaining a sensing voltage, and if yes, obtaining a parasitic capacitance voltage corresponding to the induction event; and
determining whether a value obtained by subtracting the sensing voltage from the parasitic capacitance voltage is smaller than a threshold voltage,
if yes, adjusting the system parameter, and determining whether a next induction event is occurred according to the updated system parameter,
if not, determining whether a variation of the sensing voltage is smaller than a threshold,
if not, reporting a touch point,
if yes, adjusting the system parameter, and determining whether a next induction event is occurred according to the updated system parameter.