Micro LED Groove Structure for Multi-Angle Light Extraction

The groove structure is segmented into multiple hierarchical levels: outer grooves are divided into inner grooves, which are further divided into sub-grooves. This segmentation creates a multi-scale fractal structure that increases light refraction angles without requiring a single extremely complex groove design, thereby improving light-emitting efficiency while managing structural complexity through modular division.

Different regions of the groove structure have different properties: outer grooves have different dimensions than inner grooves, which differ from sub-grooves. Each level has optimized local characteristics (width, depth, spacing) tailored to its specific function in light refraction, allowing the structure to achieve superior overall light-emitting efficiency through localized optimization at each hierarchical level.

The groove structure transitions from symmetric uniform grooves to asymmetric multi-level grooves with varying widths, depths, and spacing at different hierarchical levels. The outer grooves, inner grooves, and sub-grooves each have distinct asymmetric dimensions, enabling the interface to emit light at multiple different angles simultaneously, thus expanding the light-emitting angle range while remaining manufacturable through patterned etching processes.

The groove structure employs a nested hierarchical arrangement where sub-grooves are positioned within inner grooves, which are themselves positioned within outer grooves. This nesting creates a fractal-like multi-scale structure that provides diverse light refraction angles from a single integrated pattern, achieving versatile light-emitting characteristics without requiring multiple separate manufacturing steps.