Top Emission OLED Overcoating Layer Convex Micro Lens Light Extraction

The patent applies curvature by forming convex portions (micro-lens structures) on the surface of the encapsulation layer. These convex portions have curved surfaces that refract and guide light escaping from the OLED, directing it toward the top emission direction. This curvature transformation effectively extracts light that would otherwise be trapped by total internal reflection in the flat structure, resolving the contradiction between structural simplicity and light extraction efficiency.

The patent implements self-service by forming the micro lens array structure directly on the encapsulation layer during the OLED manufacturing process itself, rather than requiring a separate attachment step. The convex portions are created through controlled deposition or etching processes that are part of the standard OLED fabrication sequence. This integration eliminates the need for additional power-consuming operations and reduces overall device power consumption while maintaining high light extraction efficiency.