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Logo Made in Germany SID Display Week 2018

Technique for drop-on-demand formation - pulsed electro-static printing (ESJET)

High resolution ESJET printing is developed for processing of OLED devices. With appropriate nozzle geometry and driving schemes pixel structures of 10 µm and below are achievable with the final goal of printing a 310 ppi RGB AMOLED display. This novel printing technique is based on a drop-on-demand formation by pulsed electro-static printing (ESJET). Here, fluid drops or jets are generated by a pulsed applied electric field. Depending on liquid properties, much higher resolutions are achievable than by inkjet printing. In our approach towards the high-resolution printing of RGB OLED devices a hole-transport material and a light-emitting polymer are deposited by combining structured devices with controlled wettability and drop-on-demand ESJET printing. Using comparatively wide glass nozzles of 60 µm inner diameter, drop diameters below 10 µm have been printed, which is considerably lower than the droplet sizes we achieved with a 4 pl inkjet head.

Exhibitor: Fraunhofer-Institut für Angewandte Polymerforschung (IAP)

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