Array substrate with short circuit in overlapping area of signal lines prevented, electroluminescent display panel and display device

An array substrate, comprising:

• a base substrate;
• and
• a first signal line, an insulating layer and a second signal line provided sequentially on the base substrate in a direction perpendicular to the base substrate, wherein the first signal line is disposed between the base substrate and the insulating layer, the second signal line is disposed on a side of the insulatin facing away from the first signal line, and the first signal line and the second signal line cross each other,
• wherein the first signal line has a first portion and a second portion integral with each other, at least a part of the first portion is overlapped with the second signal line in an overlapping area, the second portion is not overlapped with the second signal line, and the first portion has a resistance higher than a resistance of the second portion to avoid a short circuit between the first and second signal lines due to a breakdown of the insulating layer in the overlapping area, and
• wherein the first portion of the first signal line has a smaller thickness in the direction perpendicular to the base substrate than the second portion of the first signal line, such that the first portion extends across an entire width of the first signal line in a width direction of the first signal line,
• wherein an orthographic projection of the first signal line onto the base substrate has an overlapping section and non-overlapping sections, an orthographic projection of the second signal line onto the base substrate has an overlapping section and non-overlapping sections, the overlapping section of the first signal line and the overlapping section of the second signal line coincides with each other, the non-overlapping sections of the first signal line are not overlapped with the non-overlapping sections of the second signal lines, the non-overlapping sections of the first signal line are located on two opposite sides of the overlapping section of the first signal line, respectively, and the non-overlapping sections of the second signal lines are located on two opposite sides of the overlapping section of the second signal line, respectively,
• wherein a length, along a length direction of the first signal line, of first portion of the first signal line is smaller than a length, along the length direction of the first signal line, of the second portion of the first signal line,
• wherein the insulating layer has a same thickness at a surface, facing away from the base substrate, of the first portion of the first signal line as that at a surface, facing away from the base substrate, of the second portion of the first signal line, and
• wherein a surface of the second signal line facing towards the base substrate is closer to the base substrate than the surface facing away from the base substrate, of the second portion of the first signal line.