| abstract |
The invention discloses an array substrate and a preparation method thereof, a display panel and a display device. Specifically, the present invention provides a method for fabricating an array substrate, including: providing a substrate with a driving transistor region and a switching transistor region on the substrate; forming an active layer, and the active layer is formed on the substrate On one side of the bottom, the active layer includes at least two sublayers arranged in layers; the active layer is patterned to form a driving active layer and a switching active layer, wherein the driving active layer is The orthographic projection on the substrate is located in the driving transistor region, the orthographic projection of the switching active layer on the substrate is located in the switching transistor region, and the carrier in the driving active layer is located. The carrier concentration is smaller than the carrier concentration in the switching active layer. Therefore, the uniformity of the threshold voltage of the array substrate is good, and the display quality of the display panel using the array substrate can be improved. |