Bivariate Lifetime Model for Organic Light-Emitting Diodes

Despite advantages of organic light-emitting diode (OLED) displays over liquid crystal displays, reliability concerns persist. These concerns must be addressed before OLED displays are widely adopted. In particular, existing methods are unable to reliably estimate the lifetime of large OLED displays (i.e., displays of 55 in or larger). This study proposes a novel model that incorporates physical and statistical uncertainty to estimate the lifetime of large OLED panels under normal usage conditions. A likelihood-ratio-based validation method is presented to determine the validity of the calculated model parameters. A bivariate acceleration model with two critical factors-temperature and luminance-is presented. The lifespan predicted by the proposed lifetime model shows a good agreement with the experimental results.