P‐85: Research Progress on the Influence of Black Organic Materials on OLED Display Residual Images

Organic Light‐Emitting Diode (OLED) is a depolarizer technology that constructs a color filter stack structure on thin film packaging to replace the traditional core material polarizer with a color filter on encapsulation (COE). In recent years, this technology has been widely used inflexible displays, folding mobile phones, wearable devices and other fields. It has the advantages of wide color gamut, low power consumption, and low thickness. However, the BPDL coating in the COE structure will lead to the low brightness residual image of the display panel which has become an urgent problem to be solved In this paper, the correlation between the phenomenon of residual image and the BPDL coating is first explained, and the interaction between materials and processes is concerned Secondly, the surface morphology and interface morphology of the materials were characterized and evaluated by SEM, AFM, TEM and other methods, and the mechanism of the residual image problem was summarized, and the results showed that the surface roughness andthe strength of plasmatreatment of BPDL materials were the main factors affecting the residual image Finally, the methods to improve the residual image problem are discussed, including the optimization of BPDL materials, the adjustment of process gases and parameters, etc By optimizing the BPDL material and adjusting the process gas andparameters, the residual image problem was effectively improved