Wolfspeed, Inc.
TEXTURING FOR HIGH DENSITY PIXELATED-LED CHIPS AND CHIP ARRAY DEVICES

Abstract:

A pixelated-LED chip includes an active layer with active layer portions, segregated by streets, that are configured to illuminate different light-transmissive substrate portions to form pixels. A light extraction surface of each substrate portion includes protruding features and light extraction surface recesses that may be formed by sawing. Underfill material may be provided between a pixelated-LED chip and a mounting surface, as well as between pixels and between anodes and cathodes thereof. Certain implementations provide light extraction surface recesses that are non-parallel to each street defined through the active layer. Certain implementations provide light extraction surface recesses that are non-aligned with (e.g., non-parallel to) anode-cathode boundaries of each anode-cathode pair. Such arrangements reduce a likelihood of cracking in portions of a pixelated-LED chip. Methods for fabricating pixelated-LED chips are also provided.