| abstract |
An organic light emitting diode (OLED) array substrate, its preparation method, and a display device. The OLED array substrate includes: a base substrate; power lines, gate lines, and data lines arranged on the base substrate; A pixel structure in an area defined by intersections of 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 wiring is arranged under the pixel structure and at least partially overlaps with the pixel structure; an insulating layer is arranged between the power wiring and the pixel structure, and a first via hole 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 from the pixels in the display area to the OVDD wiring. |