Shaped Filler Material In a QLED/OLED Pixel

摘要

A light-emitting device has enhanced light output by shaping as non-planar an emitting side surface of the filler material layer to improve light extraction. The light-emitting device includes a bank structure; an emissive cavity disposed within the bank structure; and a filler material layer disposed within the bank structure and on a light-emitting side of the emissive cavity. An emitting side surface of the filler material layer opposite from the emissive cavity is a non-planar emitting side surface. The emitting side surface is shaped such that the filler material layer includes a first region of positive curvature and a second region of negative curvature. The second region of negative curvature may be located adjacent to the bank structure, and the first region of positive curvature may be located centrally relative to the second region of negative curvature. The first region of positive curvature may be configured as a single element of positive curvature, or as a plurality of positive curvature elements such as a micro-lens array or a prism array.