An array substrate, comprising: a display area ; and a surrounding area , encircling the display area ; wherein: the surrounding area comprises a first zone and a second zone , wherein the first zone and the second zone are configured to have a height difference (ΔH) to form a substantially uneven upper surface of the array substrate to thereby allow a sealant to be securely attached onto the array substrate, the array substrate further comprising: a substrate ; a first signal line , disposed over the substrate ; and a second signal line , disposed over, insulated from, and overlapped at an overlapping region with, the first signal line ; wherein: the overlapping region is in the first zone ; and an orthographic projection of the first signal line on the substrate crosses or intersects with an orthographic projection of the second signal line on the substrate at a region coinciding with an orthographic projection of the overlapping region on the substrate , characterized in that the array substrate further comprises: an insulating layer , disposed between the first signal line and the second signal line at the overlapping region ; and a separation layer , disposed between the insulating layer and the second signal line at the overlapping region . a display area ; and a surrounding area , encircling the display area ; wherein: the surrounding area comprises a first zone and a second zone , wherein the first zone and the second zone are configured to have a height difference (ΔH) to form a substantially uneven upper surface of the array substrate to thereby allow a sealant to be securely attached onto the array substrate, the array substrate further comprising: a substrate ; a first signal line , disposed over the substrate ; and a second signal line , disposed over, insulated from, and overlapped at an overlapping region with, the first signal line ; wherein: the overlapping region is in the first zone ; and an orthographic projection of the first signal line on the substrate crosses or intersects with an orthographic projection of the second signal line on the substrate at a region coinciding with an orthographic projection of the overlapping region on the substrate , a substrate ; a first signal line , disposed over the substrate ; and a second signal line , disposed over, insulated from, and overlapped at an overlapping region with, the first signal line ; wherein: the overlapping region is in the first zone ; and an orthographic projection of the first signal line on the substrate crosses or intersects with an orthographic projection of the second signal line on the substrate at a region coinciding with an orthographic projection of the overlapping region on the substrate , the overlapping region is in the first zone ; and an orthographic projection of the first signal line on the substrate crosses or intersects with an orthographic projection of the second signal line on the substrate at a region coinciding with an orthographic projection of the overlapping region on the substrate , characterized in that the array substrate further comprises: an insulating layer , disposed between the first signal line and the second signal line at the overlapping region ; and a separation layer , disposed between the insulating layer and the second signal line at the overlapping region . an insulating layer , disposed between the first signal line and the second signal line at the overlapping region ; and a separation layer , disposed between the insulating layer and the second signal line at the overlapping region . <EOS>