AMOLED 디스플레이 패널의 Cathode 전압 분포에 관한 연구

Abstract

Organic light emitting diode (OLED) displays are being actively developed as the flat panel displays of the future. However, there are still many problems to solve. In particular, as the panel size and resolution increase, the rising ground voltage on the panel causes image degradation, through a non-uniformity in brightness. In this paper, the voltage distribution of cathode in AMOLED panels is investigated as a function GND structure, GND side line resistance, GND input resistance, the number of GND inputs and cathode sheet resistance. We present a network model which is composed of unit model resistors. A simplified equivalent cathode model is suggested to simulate the distribution for the GND structure. According to the range of resistance value, the simulation was divided into the top and the bottom emitting structures for various simulations. We investigated various cases of GND distribution in AMOLED panels. The simulation results show the important factors of GND rising, which might be a design guideline for large-size AMOLED displays.