Array substrate, liquid crystal display panel and display device

An array substrate, a liquid crystal display panel and a display device wherein the array substrate comprises a substrate (10), a first insulating layer (20), a second insulating layer (30), a third insulating layer (40), a flat layer (50), a first electrode layer (90A), a fourth insulating layer (70) and a second electrode layer (90B); the third insulating layer (40) comprises a first interlayer insulating layer (40A), a second interlayer insulating layer (40B) and a third interlayer insulating layer (40C) which are stacked in sequence; the first interlayer insulating layer (40A) is located on the side, close to the substrate (10), of the second interlayer insulating layer (40B), and the third interlayer insulating layer (40C) is located on the side, away from the substrate (10), of the second interlayer insulating layer (40B); the first interlayer insulating layer (40A) and the third interlayer insulating layer (40C) are made of silicon oxide; the material of the second interlayer insulating layer (40B) inc