Micro LED Unit Pixel Substrate Pattern for Uniform Viewing Angles

The transparent substrate is designed with a concavo-convex pattern featuring curved surfaces instead of a flat surface. The convex portions protrude toward the light emitting devices while concave portions recess between them, creating curvature that redirects light emission angles. This curvature modifies the optical path of light from sub-pixels, achieving uniform viewing angles across different colors without requiring complex additional optical components.

The concavo-convex pattern creates local variations in the substrate surface where convex portions are positioned to correspond with specific sub-pixel locations. Each convex portion locally modifies the light emission characteristics of its corresponding sub-pixel, enabling precise control over viewing angles for red, green, and blue sub-pixels individually, thereby achieving uniform color representation across different viewing angles.

The concavo-convex pattern introduces curvature to the transparent substrate surface, where convex portions redirect light from different sub-pixels to achieve uniform emission angles. This curvature-based optical control ensures that red, green, and blue light maintain consistent viewing angles, eliminating color variations when viewed from different angles without adding complex optical layers.

The concavo-convex pattern on the transparent substrate acts as an intermediary optical element between the light emitting devices and the viewer. This patterned substrate surface mediates the light emission by redirecting rays from sub-pixels, ensuring uniform viewing angles for all colors while maintaining the simplicity of the overall device structure.