11‐2: Development of Next‐Generation Inkjet Printer for High‐Resolution QD‐OLED Display

In this study, we developed an 8.5 generation inkjet printer that can produce 220 ppi QD‐OLED panels which implement red, green, and blue colors using QDs as a color conversion layer. QDs have excellent color reproduction compared to OLED and the high contrast ratio, make it possible to achieve ultra‐high definition. If these advantages of QDs are implemented at high resolution, clearer image quality can be obtained. In order to produce panels of 220ppi or higher, more precise head ejection and a stable ink circulation systems are required compared to existing facilities. To this end, we implemented a high‐resolution inkjet printing system in three major development directions: inkjet stage correction technology, optimization of head ejection and ink circulation process, and printing pattern S/W technology. We have finally achieved production of 220 ppi (27” 5K) monitor panels, which is at the level of mass production defects.