Red, green and blue organic EL materials were patterned, each in the subpixel pitch of 20µm, to create an array of 40 x 40 dots with a resolution of 640pixel/in. Illumination with ultraviolet light confirmed that red, green and blue dots emitted light separately.
According to the partners, organic EL displays are increasingly used in televisions, mobile devices and wearables. Resolutions of at least 200pixel/in are needed for 4K televisions, while full HD mobile devices require 500pixel/in displays.
Fujifilm and imec say the results could open new applications, including creating an OLED array that adds a fourth colour to red, green and blue, as well as developing sensors that integrate an OLED with an organic photodetector.
