Patent ID: 9280243
Filing Date: 2016-03-08
CPC Classification: G06F

Claim Text:
1. A sensing method using self-capacitance and mutual-capacitance alternatively to reduce touch noises in a capacitive multi-touch system including a capacitive touch panel, a first driving and sensing device, a second driving and sensing device, and a control device, wherein the first driving and sensing device and the second driving and sensing device respectively has a first work mode and a second work mode, and the first driving and sensing device and the second driving and sensing device perform a self-capacitance sensing at the first work mode and perform a mutual-capacitance sensing at the second work mode, the sensing method comprising the steps of: (A) initializing the first driving and sensing device and the second driving and sensing device by the control device; (B) configuring the first driving and sensing device and the second driving and sensing device as the first work mode or the second work mode to alternatively perform the self-capacitance sensing and the mutual-capacitance sensing on the capacitive touch panel for finding a first possible touch point range or a second possible touch point range, wherein, in step (B), the control device configures the first driving and sensing device and the second driving and sensing device as the first work mode to perform at least one self-capacitance sensing on the capacitive touch panel for producing a self-capacitance image raw data, and the control device configures the first driving and sensing device and the second driving and sensing device as the second work mode to perform at least one mutual-capacitance sensing on the capacitive touch panel for producing a mutual-capacitance image raw data; (C) determining whether there is a range conjunction between the first possible touch point range and the second possible touch point range; and (D) producing a possible touch point range conjunction when there is the range conjunction, and calculating coordinates of touch points based on the possible touch point range conjunction.