Touch display panel

A touch display panel includes a display panel and a touch electrode layer. The display panel has a display area and a peripheral area. The touch electrode layer includes a non-edge cell region in which the vertical projection is completely located in the vertical projection of the display region, and an edge cell region in which the vertical projection overlaps with the vertical projection of thedisplay region and the peripheral region. The size of the edge unit area is larger than the size of the non-edge unit area. The touch electrode layer includes a first electrode string and a second electrode string having different extending directions. The occupied area of the first electrode string disposed in the non-edge cell region is A1, and the occupied area of the first electrode string disposed in the edge cell region is A1', wherein |A1-A1'|/A1