An in-cell touch display panel includes a first substrate, a second substrate parallel to the first substrate, a liquid crystal layer configured between the first and second substrates, and a black matrix layer disposed at a surface of the first substrate facing to the liquid crystal layer. The black matrix includes a plurality of opaque conductive lines. The opaque conductive lines are divided into a first group, a second group and a third group of opaque conductive lines. The second group of opaque conductive lines is formed with N polygonal regions where N is a positive integer. The opaque conductive lines in any one of the polygonal regions are electrically connected together while any two polygonal regions are not electrically connected.