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.