J. Eur. Opt. Soc.-Rapid Publ.
Volume 15, Number 1, 2019
|Number of page(s)||9|
|Published online||10 June 2019|
Illumination optics design for DMD Pico-projectors based on generalized functional method and microlens array
College of Electronic Information and Automation, Tianjin University of Science and Technology, 300222, Tianjin, People’s Republic of China
2 Zhong Ying Optical Co. Ltd, Xinlun Village Section, Pan Zhong Road, Min Zhong Town, 528441, Zhongshan City, Guangdong, People’s Republic of China
Accepted: 22 May 2019
The influence of incident angle and aberration of the microlens array on the optical efficiency in pico-projector is analyzed. By modifying the relevant parameters, a method to optimize the optical efficiency and uniformity of the illumination system is proposed. By changing the profile of the freeform double lens used for the concentrator of LED source, the incident angle can be reduced, thus the efficiency loss caused by large angle incident can be reduced. In addition, two spherical relay lenses instead of the Fourier lenses are used as integral component after the microlens array, which is not only low cost, but also more flexible in controlling aberrations. After system optimization, the illumination efficiency and uniformity of the pico-projector system can reach 60.51% and 86.2%, which verifies the feasibility and validity of the theoretical analysis.
Key words: Non-imaging optics / Microlens array / Pico-projector / LED
© The Author(s) 2019
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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