The feasibility of using ink jet printing to define hole conduction and electroluminescent layers in OLED display has been well demonstrated. The particular motivation for ink jet printing has been driven by the prospect of developing scalable and adaptable manufacturing processes, enabling large substrate sizes to be processed, without the requirement for expensive product specific tooling. In this paper we discuss the implication of scalable and adaptable criteria for an ink jet print process and demonstrate how this can be achieved by development of suitable ink formulations.
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