Patent ID: 9716135
Date: 2017-07-25
CPC Classifications: H01L

Claim:
1. A method of fabricating an OTFT array substrate comprising the steps of: providing a base substrate; depositing a metal layer and an ITO layer on the base substrate, subsequently covering a photoresist layer thereon and then forming a data line, a source electrode, a drain electrode and a pixel electrode by a first mask process, wherein the first mask process comprises patterning the photoresist layer by using a first mask, wherein the first mask process further comprises wet etching the ITO layer and the underlying metal layer with an etching solution after the photoresist layer has been patterned, and subsequently ashing the photoresist layer by using plasma and removing a photoresist residue, wherein the surface of the metal layer is covered by the ITO layer except where the source electrode and the drain electrode are located after the first mask process has been completed; coating an organic semiconductor layer on the array substrate having the data line, the source electrode, the drain electrode, and the pixel electrode formed thereon and then forming an active layer by a second mask process, subsequently coating an organic insulating layer on the organic semiconductor layer to cover the organic semiconductor layer on an entire surface of the work-in-progress array substrate, wherein the second mask process comprises patterning the organic semiconductor layer by using a second mask; depositing a metal layer on the organic insulating layer and then forming a gate electrode and a scanning line by a third mask process, subsequently coating an organic insulating layer on the entire surface of the work-in-progress array substrate to form a passivation layer so that the passivation layer covers on the entire surface of the work-in-progress array substrate, wherein the third mask process comprises patterning the metal layer by using a third mask; exposing the pixel electrode by performing a fourth mask process to the passivation layer, wherein the fourth mask process comprises patterning the passivation layer by using a fourth mask; and depositing a layer of OLED material on the exposed pixel electrode to form an OLED device.