a thin film transistor substrate;

a light-emitting layer disposed on the thin film transistor substrate, the light-emitting layer comprising a cathode;

an encapsulation layer disposed on the light-emitting layer; and

a touch layer disposed on the encapsulation layer, and the touch layer comprising a plurality of touch sensing electrodes disposed in a same layer;

wherein the touch sensing electrodes are connected to a plurality of touch signal lines in a one-to-one correspondence, the touch signal lines are connected to a touch chip, a coupling capacitor is formed between the touch sensing electrodes and the cathode, and the touch chip determines whether there is a touch operation or not by detecting a variation of the coupling capacitor;

the touch sensing electrodes are made of a metal grid structure, each of intersections of metal lines of the metal grid is a closed arc-shape; and

a plurality of protrusions are disposed on two opposite sides of each of the touch sensing electrodes, and the protrusions disposed on each of the sides are engaged with the protrusions of adjacent one of the touch sensing electrodes, and

wherein the touch layer comprises a first sub-region, a second sub-region, and a third sub-region, the first sub-region and the second sub-region region are disposed oppositely, and the third sub-region is disposed adjacent to the first sub-region and the second sub-region.