Multi-touch positioning method for capacitive touch panel

A multi-touch positioning method for a capacitive touch panel, wherein the capacitive touch panel has a plurality of first capacitive sensor pads arranged in a matrix and a plurality of second capacitive sensor pads arranged in a matrix, the first capacitive sensor pads arranged in the same row along a first direction are electrically connected to one another and coupled to a sensing element, the second capacitive sensor pads arranged in the same row along a second direction are electrically connected to one another and coupled to the sensing element, one of the first capacitive sensor pads is adjacent to at least one of the second capacitive sensor pads, a position is defined by one of the first capacitive sensor pads and one of the second capacitive sensor pads which are adjacent to each other, and the method comprises:

• (a) generating a candidate touching position array correspondingly when the capacitive touch panel is touched by at least three objects, wherein the candidate touching position array comprises a first candidate position group, a second candidate position group and a third candidate position group, the first candidate position group comprises at least three first candidate positions arranged along the first direction, the second candidate position group comprises at least three second candidate positions arranged along the first direction, and the third candidate position group comprises at least three third candidate positions arranged along the first direction;
• (b1) comparing the signal magnitude which is sensed by the sensing element and corresponds to the first candidate position group, the signal magnitude which is sensed by the sensing element and corresponds to the second candidate position group and the signal magnitude which is sensed by the sensing element and corresponds to the third candidate position group;
• and
• (c1) determining one of the three first candidate positions which is closest to the sensing element along the first direction as a first actual touching position, determining one of the three second candidate positions which is located between the second candidate position closest to the sensing element and the second candidate position farthest from the sensing element along the first direction as a second actual touching position, and determining one of the three third candidate positions which is farthest from the sensing element along the first direction as a third actual touching position when the signal magnitude corresponding to the first candidate position group is larger than the signal magnitude corresponding to the second candidate position group and the signal magnitude corresponding to the second candidate position group is larger than the signal magnitude corresponding to the third candidate position group.