| abstract |
An organic light emitting diode (OLED) array substrate, a preparation method thereof, and a display device, the OLED array substrate comprises: a base substrate; a pixel structure in the area defined by the intersection of the data lines, the pixel structure includes a switching transistor, a driving transistor and an OLED device; wherein the switching transistor is connected to the gate line and the data line, and the driving transistor is connected to the switching transistor, the power supply wiring and the OLED device; The power supply wiring is arranged below the pixel structure and at least partially overlapped with the pixel structure; an insulating layer is arranged between the power supply wiring and the pixel structure, and a first via structure is arranged in the insulating layer; the power wiring passes through the first via hole The structure is connected to the drive transistor. The OLED array substrate increases the aperture ratio and reduces the impedance of the display area pixel to the OVDD wiring. |