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arXiv · 1906.07824

POLED displays: Robust printing of pixels

P. Kant·A. L. Hazel·M. Dowling·A. B. Thompson·A. Juel
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Abstract

The fabrication of a high-quality POLED (Polymeric Organic Light Emitting Diode) display requires the deposition of identical, uniform fluid films into a large number of shallow recessed regions that form a regular array of pixels on a display backplane. We determine the protocols required to achieve continuous liquid coverage of the entire pixel area for the case where equally-spaced fluid droplets are sequentially printed along a straight line within a stadium-shaped pixel, and explore how these protocols depend on the wetting properties of the pixel surface. Our investigation uses a combination of experiments and numerical modelling, based on the assumption of fluid redistribution via capillary spreading according to a Cox-Voinov law. We show that the model is able to predict quantitatively the evolution of the liquid deposited in a pixel and provides a computationally inexpensive design tool to determine efficient printing strategies that account for uncertainties arising from imperfect substrate preparation or printhead dysfunction.

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P. Kant, A. L. Hazel, M. Dowling, A. B. Thompson, A. Juel. 2019-06-18. POLED displays: Robust printing of pixels. https://doi.org/10.1063/1.5115410

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