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7 March 2019 Micro-LED optical engine with biologically inspired artificial compound eyes for pico-projection display
Heng Zhao, Dengxin Hua, Jun Wang, Qing Yan
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Proceedings Volume 11053, Tenth International Symposium on Precision Engineering Measurements and Instrumentation; 110530P (2019) https://doi.org/10.1117/12.2512049
Event: 10th International Symposium on Precision Engineering Measurements and Instrumentation (ISPEMI 2018), 2018, Kunming, China
Abstract
Light emitting diodes (LEDs) have recently gained much interest as projection light sources. In this work, a compound parabolic concentrator (CPC) coupled to a biologically inspired compound-eye array is designed and fabricated as a light collection engine of a pico-projector. The results indicate that more than 90% light emitted by a monolithic LED array can be collected by the CPC coupled to a compound-eye array and transmitted within the designed angle. This method is advantageous 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 a collection efficiency of 87% of micro-LED emitted light. Moreover, the beam collimation quality has been analyzed obtaining a residual divergence of less than 2º. Thus, the results achieved by the proposed optical system improve those obtained with several commercially available devices.
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Heng Zhao, Dengxin Hua, Jun Wang, and Qing Yan "Micro-LED optical engine with biologically inspired artificial compound eyes for pico-projection display", Proc. SPIE 11053, Tenth International Symposium on Precision Engineering Measurements and Instrumentation, 110530P (7 March 2019); https://doi.org/10.1117/12.2512049
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KEYWORDS
Light emitting diodes
Compound parabolic concentrators
Projection systems
Microlens array
Collimation
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