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, wherein in the case where touch data of the touch image corresponding to only the first column electrode from the edge of the pixel active area and only the first row electrode from the edge of the pixel active area are mirror-copied, the location (x ave , y ave ) of the central point of the touch image is calculated by the following formula, wherein V x,y is the touch data that is linked to capacitance of a touch level at a location (x, y), M is the number of column electrodes, and N is the number of row electrodes: x ave = ∑ x = 1 M ⁢ ⁢ ∑ y = 1 N ⁢ ⁢ ( x mod ⁢ v x , y ) ⁢ / ⁢ ∑ x = 1 M ⁢ ⁢ ∑ y = 1 N ⁢ ⁢ ( kv x , y ) , wherein: if x=1, then x mod =1+(−1)=0, and k=2; if x=M, then x mod =M+(M+2)=2M+2, and k=2; and if x≠1 and x≠M, then x mod =x, and k=1, and y ave = ∑ x = 1 M ⁢ ⁢ ∑ y = 1 N ⁢ ⁢ ( y mod ⁢ v x , y ) ⁢ / ⁢ ∑ x = 1 M ⁢ ⁢ ∑ y = 1 N ⁢ ⁢ ( kv x , y ) , wherein: if y=1, then y mod =1+(−1)=0, and k=2; if y=N then y mod =N+(N+2)=2N+2, and k=2; and if y≠1 and y≠N, then y mod =y, and k=1.