Researchers from Korea's ETRI, working together with Gosan Tech and Duksan Neolux, developed a new inkjet printing based process to deposit single-substrate stacked QD-OLED panels.
Samsung Display, the only company that produces commercial QD-OLED displays, utilizes a process that deposits the OLED emitters and the QD layers on different substrates, which are then bonded together. Producing both the emitters and the QDs on the same substrate will make the process easier (and thus cheaper), and will also enable higher resolutions (as the alignment on the bonding process limits the resolution).
To develop the process, the researchers used a structure in which the black PDL (Pixel Defining Layer and the QD layers are deposited directly on top of the blue OLED device. Utilizing inkjet-printing for both the QD and the PDL layers, this enables a single manufacturing flow for the entire process.
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