1. A touch detection method, comprising: scanning row electrodes or column electrodes of a touch sensor in sequence to obtain touch data of the touch sensor; labeling a plurality of coordinates as a touch image according to the touch data; mirror copying the touch data of the touch image corresponding to at least one column electrode and at least one row electrode which are adjacent to an edge of the pixel active area in the x-direction and the y-direction, respectively, to at least one corresponding location which is outside of the touch sensor active area with respect to the edge of the pixel active area; calculating a location (x ave , y ave ) of the central point of the touch image by a weighted average; and outputting the location (x ave , y ave ) of the central point of the touch image.