Micro-LED optical engine with biologically inspired artificial compound eyes for pico-projection display

摘要

Light emitting diodes (LEDs) have recently gained much interest as projection light sources. In this work, a compoundparabolic concentrator (CPC) coupled to a biologically inspired compound-eye array is designed and fabricated as a lightcollection engine of a pico-projector. The results indicate that more than 90% light emitted by a monolithic LED array canbe collected by the CPC coupled to a compound-eye array and transmitted within the designed angle. This method isadvantageous in many respects compared with those available, such as compact volume, high collection efficiency,rectangular radiation pattern and controllable output divergence angle. The result validates that the system reaches acollection efficiency of 87% of micro-LED emitted light. Moreover, the beam collimation quality has been analyzedobtaining a residual divergence of less than 2º. Thus, the results achieved by the proposed optical system improve thoseobtained with several commercially available devices.