Backboard and display device

• Main Authors: GUI BINGQIANG, GAO TAO, WANG MINGHUI, LI ZELIANG, LU YUQUN
• Format: Patent
• Language: Chinese; English
• Published: 28.03.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; SEMICONDUCTOR DEVICES

The invention provides a backboard and a display device. The back plate comprises a substrate base plate, a first electrode and a second electrode, the pixel driving circuit is arranged on the substrate; the pixel driving circuit comprises a metal oxide active layer; the metal oxide active layer is provided with a first surface and a second surface which are parallel to each other and are not coplanar, and a connecting side surface for connecting the first surface and the second surface; the slope angle of the connecting side face is larger than 5 degrees and smaller than 50 degrees. Wherein the metal oxide active layer comprises a first metal oxide active layer and a second metal oxide active layer which are stacked in the direction away from the substrate; wherein the etching rate of the first metal oxide active layer is greater than that of the second metal oxide active layer, and the material of the first metal oxide active layer is different from that of the second metal oxide active layer. The display d