Abstract
In illumination optics, color mixing is a key design task, but the realization can be a challenge. While tunable light sources based on multiple LEDs are commonplace, color homogenization is just as important for white LEDs, due to their spatial and angular color variation. In this tutorial, we first look at color mixing from an abstract, phase space-based viewpoint. From there, we derive a taxonomy of color mixing problems: How is the multi-color light source composed? What kind of homogeneity is required in the target? How is the homogenization influenced by source and target étendue? We categorize these problems and we present a toolbox: A selection of optical design elements, e.g. mixing rods and fly’s eye arrays, and we show for each design pattern how it fits into the taxonomy.
Acknowledgment
The authors would like to thank OSRAM Opto Semiconductors and Auer Lighting for images provided.
References
[1] E. Gamma, R. Helm, R. Johnson and J. Vlissides, in ‘Design Patterns: Elements of Reusable Object-Oriented Software’, (Addison-Wesley, Boston, MA, USA, 1994).Suche in Google Scholar
[2] A. Herkommer, Opt. Eng. 53, 031304 (2013).10.1117/1.OE.53.3.031304Suche in Google Scholar
[3] M. Testorf, B. Hennelly and J. Ojeda-Castaneda, in ‘Phase-Space Optics: Fundamentals and Applications’, (McGraw Hill, New York, NY, USA, 2010).Suche in Google Scholar
[4] R. Winston, J. C. Miñano and P. Benitez, in ‘Nonimaging Optics’, (Elsevier Academic Press, London, UK, 2005).10.1016/B978-012759751-5/50004-XSuche in Google Scholar
[5] R. Winston, L. Jiang and M. Ricketts, Adv. Opt. Photonics 10, 484–511 (2018).10.1364/AOP.10.000484Suche in Google Scholar
[6] J. Chaves, in ‘Introduction to Nonimaging Optics’, (CRC Press, Boca Raton, FL, USA, 2016).Suche in Google Scholar
[7] G. Brooker, in ‘Modern Classical Optics’, (Oxford University Press, Oxford, UK, 2003).Suche in Google Scholar
[8] A. Krasnoshchoka, A. Thorseth, C. Dam-Hansen, D. Corell, P. Petersen, et al., Materials 10, 1407 (2017).10.3390/ma10121407Suche in Google Scholar PubMed PubMed Central
[9] O. Mehl and M. Daniels, European Patent Application EP3045950A1 (2016).Suche in Google Scholar
[10] P. Benitez, J. C. Minano, P. Zamora, M. Hernandez and A. Cvetkovic, ‘Kohler Concentrator’, United States Patent Application US2010O123954A1 (2010).Suche in Google Scholar
[11] O. Dross, R. Mohedano, M. Hernández, A. Cvetkovic, J. C. Miñano, et al., Proc. SPIE 71030G (2008).10.1117/12.798111Suche in Google Scholar
[12] R. Bader, S. Haussener and W. Lipinski, J. Sol. Energy Eng. 137, 021012 (2014).10.1115/1.4028702Suche in Google Scholar
[13] N. Morgenbrod, ‘Solar Simulator and Method for Operating a Solar Simulator’, United States Patent Application US 2013 O294.045A1 (2013).Suche in Google Scholar
[14] H. Rehn and U. Hartwig, Proc. SPIE 77850F (2010).10.1117/12.859447Suche in Google Scholar
[15] J. Muschaweck and H. Ries, Proc. SPIE 594206 (2005).10.1117/12.615874Suche in Google Scholar
[16] L. Shapiro, Proc. SPIE 2650, 209–216 (1996).10.1117/12.237015Suche in Google Scholar
[17] ‘Information Display Measurements Standard’, Society for Information Displays, https://www.icdm-sid.org/downloads/idms1.html (2012).Suche in Google Scholar
[18] T. Q. Khanh, P. Bodrogi and T. Q. Vinh, in ‘Color Quality of Semiconductor and Conventional Light Sources’, (Wiley VCH, Weinheim, Germany, 2017).10.1002/9783527803453Suche in Google Scholar
[19] H. Rehn, Proc. SPIE 4775 (2002).Suche in Google Scholar
[20] A. Köhler, Z. Wiss. Mikrosk. 10, 433 (1893).10.1017/S0016756800174072Suche in Google Scholar
[21] H. Rehn, Opt. Eng. 43, 1480 (2004).10.1117/1.1755231Suche in Google Scholar
[22] M. Daniels and I. Schmidt, ‘Focus when Laser Light Sources’, German Patent Application DE102016218245A1 (2018).Suche in Google Scholar
[23] K. Franz and U. Hartwig, ‘Lighting Apparatus with Phosphor Element’, United States Patent Application US 2013 0329448A1 (2013).Suche in Google Scholar
[24] S. Magarill, ‘Apparatus for Uniformly Illuminating a Light Valve’, United States Patent USOO5625738A (1997).Suche in Google Scholar
[25] M. E. Levis and H. Gourley, ‘Projector System with Hollow Light Pipe Optics’, United States Patent USOO5829858A (1998).Suche in Google Scholar
[26] B. Wagner, ‘Hohlintegrator’, United States Patent US6625380B2 (2003).Suche in Google Scholar
[27] M. Angelini, C. Bigliati and E. Grossi, ‘Light Mixing Lenses and Systems’, PCT Patent Application WO2013098387A2 (2013).Suche in Google Scholar
[28] T. Vinther, ‘Illumination System Comprising an Optical Light Mixing Rod and a Pressure Mechanism to Apply a Pressure Force to the Optical Light Mixing Rod and to Press an Entrance Surface and Emitting Window Together’, United States Patent US9612380B2 (2017).Suche in Google Scholar
[29] H. Rehn, Proc. SPIE 105901L (2017).Suche in Google Scholar
[30] H. Rehn, Proc. SPIE 5529, 157 (2004).10.1117/12.560580Suche in Google Scholar
[31] J.-W. Pan, C.-M. Wang, W.-S. Sun and J.-Ya. Chang, Appl. Optics 46, 5097–5102 (2007).10.1364/AO.46.005097Suche in Google Scholar PubMed
[32] W. J. Cassarly, Proc. SPIE 710307 (2008).10.1117/12.797748Suche in Google Scholar
[33] C. F. Dimas, S. Read and J. J. Kuta, Proc. SPIE 4768, 82–92 (2002).10.1117/12.482180Suche in Google Scholar
[34] W. J. Cassarly, ‘Rippled Mixers for Uniformity and Color Mixing’, United States Patent US7777955B2 (2010).Suche in Google Scholar
[35] T. S. Bonenberger, J. Baumgart and C. Neumann, Adv. Opt. Technol. 5, 157 (2016).10.1515/aot-2015-0056Suche in Google Scholar
[36] M. Kuwata, H. Takeuchi, T. Sasagawa, S. Yagyu and H. Sugiura, J. Soc. Inf. Display 15, 829 (2007).10.1889/1.2798823Suche in Google Scholar
[37] F. Potekev, ‘Morphing Light Guide’, United States Patent Application US 2006004.4531A1 (2006).Suche in Google Scholar
[38] T. L. R. Davenport, W. J. Cassarly and T. A. Hough, Proc. SPIE 594204 (2005).10.1117/12.623007Suche in Google Scholar
[39] D. Schmidt, C. Symanowski and G. Schroeter, ‘Device for Generating a Quadrangular Illuminating Field and use of such Device in an Optical Device Comprising a Surface to be Illuminated having a Predetermined Shape’, United States Patent USOO6578999B2 (2003).Suche in Google Scholar
[40] B. G. Crowther, D. G. Koch, J. M. Kunick, J. P. McGuire, R. Harned, et al., Proc. SPIE 4832, 302–310 (2002).10.1117/12.486462Suche in Google Scholar
[41] B. A. Jacobson, R. D. Gengelbach and J. M. Ferri, Proc. SPIE 3139, 141–150 (1997).10.1117/12.290218Suche in Google Scholar
[42] J. Muschaweck, Proc. SPIE 79540A (2011).10.1117/12.877219Suche in Google Scholar
[43] J. Mihalyi, ‘Projection System for Color Pictures’, United States Patent 1,762,932 (1930).Suche in Google Scholar
[44] P. Schreiber, S. Kudaev, P. Dannberg and U. D. Zeitner, Proc. SPIE 59420K (2005).10.1117/12.618747Suche in Google Scholar
[45] L. Wang, J. M. Sasián, P. Su and R. John Koshel, Proc. SPIE 74230Y (2009).10.1117/12.836726Suche in Google Scholar
[46] W. J. Cassarly, S. R. David, D. G. Jenkins, A. P. Riser and T. L. R. Davenport, Opt. Eng. 39, 1830–1840 (2000).10.1117/1.602565Suche in Google Scholar
[47] W. Pohl, C. Anselm, C. Knoflach, A. Timinger, J. Muschaweck, et al., Proc. SPIE 5186 (2003).Suche in Google Scholar
[48] ARRI Group, ‘ARRISCAN XT’, https://www.arri.com/archive_technologies/arriscan, (2018).Suche in Google Scholar
[49] R. Ulbricht, in ‘Das Kugelphotometer: (Ulbricht’sche Kugel)’, (R. Oldenbourg, Germany, 1920).Suche in Google Scholar
[50] D. G. Goebel, Appl. Optics 6, 125–128 (1967).10.1364/AO.6.000125Suche in Google Scholar PubMed
[51] Labsphere, ‘Technical guide integrating sphere uniform light source applications’, http://labsphere.com/site/assets/files/2552/a-guide-to-integrating-sphere-uniform-light-source-applications.pdf (2018).Suche in Google Scholar
[52] Labsphere, ‘TECHNICAL GUIDE integrating sphere theory and applications’, http://labsphere.com/site/assets/files/2551/integrating_sphere_theory_apps_tech_guide.pdf (2018).Suche in Google Scholar
[53] Labsphere, ‘A guide to integrating sphere radiometry and photometry’, http://labsphere.com/site/assets/files/2550/radiometry_and_photometry_tech_guide-1.pdf (2018).Suche in Google Scholar
[54] J. Chaves, W. Falicoff, P. Benitez, J. C. Miñano, W. A. Parkyn, et al., Proc. SPIE 63380L (2006).10.1117/12.683298Suche in Google Scholar
©2019 THOSS Media & De Gruyter, Berlin/Boston
Artikel in diesem Heft
- Cover and Frontmatter
- Editorial
- Reviewer recognition and editor’s note 2019
- Community
- EOS News
- Editorial
- Illumination optics for indoor lighting, automotive and street lighting
- Topical Issue: Illumination optics for indoor lighting, automotive and street lighting
- Tutorial
- Illumination design patterns for homogenization and color mixing
- Review Article
- High-resolution headlamps – technology analysis and system design
- Research Articles
- Creating high contrast in virtual night driving
- Spectral ray data for optical simulations
- Photobiological safety of LED-based lighting systems – theory and practical hazard assessment
- Road projections as a new and intuitively understandable human-machine interface
Artikel in diesem Heft
- Cover and Frontmatter
- Editorial
- Reviewer recognition and editor’s note 2019
- Community
- EOS News
- Editorial
- Illumination optics for indoor lighting, automotive and street lighting
- Topical Issue: Illumination optics for indoor lighting, automotive and street lighting
- Tutorial
- Illumination design patterns for homogenization and color mixing
- Review Article
- High-resolution headlamps – technology analysis and system design
- Research Articles
- Creating high contrast in virtual night driving
- Spectral ray data for optical simulations
- Photobiological safety of LED-based lighting systems – theory and practical hazard assessment
- Road projections as a new and intuitively understandable human-machine interface