A Method to Improve IR Drop issue of Large-Size Top-Emission AMOLED. Issue 1 (May 2021) - Yang, Shuzhen
Abstract: Top-emitting active-matrix organic light-emitting diode (AMOLED) displays usually use a thin cathode layer to obtain high transmittance. However, the thin surface cathode inevitably raises an IR drop issue or even a Mura effect that is visible to the naked eyes, especially in large-size displays. Therefore, to reduce the IR-drop effect and improve the display quality, a plurality of cathode separators are provided to separate the cathode of AMOLEDs to electrically connect the cathode to the auxiliary electrodes under the cathode separators. In this work, we report how to control the process of organic photoresist to obtain a good anti-taper (cathode separator). The organic photoresist is formed through the steps of coating, pre-bake, exposure, post exposure bake (PEB) and then developing, but the exposure and PEB processes are the key factors, which can improve the anti-taper below 53° (The EL evaporation angle is 53°).