A 403‐ppi (pixel per inch) real RGB active‐matrix organic light‐emitting diode (AMOLED) was fabricated without using fine metal mask (FMM). Organic light‐emitting materials were printed on array panel, with a novel process that has the advantages of low cost and high pixel density. The uniformity of the organic light‐emitting diodes (OLEDs) was improved with carefully tuning printing parameters, and good panel performance was achieved. The key to such a process was the design of the hexagonal patterning of the pixels. The image quality of the panel with this hexagonal pixel arrangement was evaluated with a bmp format Pixel Layout Simulation picture.

A 403ppi (pixel per inch) real RGB AMOLED was fabricated without using Fine Metal Mask (FMM). Organic light-emitting layer material was printed on array panel, resulting in a novel process with low cost and high pixel density. The OLED materials printed uniformly and the OLED device performed good property. The profile of the pixel was designed as a hexagonal pattern. Based on this design, it is possible to achieve 403 ppi real AMOLED using pixel printing process. The image quality for this hexagonal pixel arrangement was evaluated by a bmp format Pixel Layout Simulation picture.