The present disclosure provides an array substrate, a manufacturing method thereof and a display. By forming a source pattern layer on the base substrate in the present disclosure, the source pattern layer crossing the gate pattern layer maybe mutually insulated from the gate pattern layer through the insulating buffer layer, thus eliminating the dielectric layer in the prior art which is formed to insulate the source pattern layer and the gate pattern layer, further simplifying the structure of the array substrate, and reducing the process steps and process costs.