This disclosure discloses an array substrate and a manufacturing method, and a display device, the array substrate including: a channel layer; a gate insulating layer including a first portion and a second portion connected side by side, arranged on the channel layer, and exposing a source and drain contact zone on the channel layer, the second portion of the gate insulating layer being located on both sides of the first portion of the gate insulating layer; a gate layer, disposed on the first portion of the gate insulating layer; and a source and a drain, correspondingly connected to the contact region of the source and drain of the channel layer respectively. The array substrate of this disclosure solves the array substrate leakage problem caused by conductorizing the channel layer due to performing ion implantation to the channel layer.