Abstract

Standard nonimaging components used to collect and integrate light in light-emitting-diode-based projector light engines such as tapered rods and compound parabolic concentrators are compared to optimized freeform shapes in terms of transmission efficiency and spatial uniformity. We show that the simultaneous optimization of the output surface and the profile shape yields transmission efficiency within the étendue limit up to 90% and spatial uniformity higher than 95%, even for compact sizes. The optimization process involves a manual study of the trends for different shapes and the use of an optimization algorithm to further improve the performance of the freeform lightpipe.

© 2008 Optical Society of America

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  1. F. Fournier and J. Rolland, “Design methodology for high brightness projectors,” J. Display Technol. 4, 86-91 (2008).
  2. J. M. Teijido, F. Ludley, O. Ripoll, M. Ueda, Y. Oshima, T. Yoshida, K. Toyota, K. Yamamoto, T. Nagara, Y. Kato, A. Wajiki, and S. Umeya, “73.2: compact three panel LED projector engine for portable applications,” SID Int. Symp. Digest Tech. Papers (2006).
  3. E. Geissler, “Meeting the challenges of developing LED-based projection displays,” presented at the Photonics in Multimedia Conference, Strasbourg, France, 3-7 April 2006.
  4. M. H. Keuper, G. Harbers, and S. Paolini, “26.1: RGB LED illuminator for pocket-sized projectors,” SID Int. Symp. Digest Tech. Papers 35, 943-945 (2004).
  5. M. R. Krames, O. B. Shchekin, R. Mueller-Mach, G. O. Mueller, Z. Ling, G. Harbers, and M. G. Craford, “Status and future of high-power light-emitting diodes for solid-state lighting,” J. Display Technol. 3, 160-175 (2007).
  6. R. Karlicek, “Photonic Lattice LEDs are new class of light-emitting device,” LEDs Magazine , 20-23 (August 2007).
  7. E. H. Stupp and M. S. Brennesholtz, Projection displays, Wiley SID series in display technology (Wiley, 1999), pp. xviii, 418.
  8. M. P. Krijn, B. A. Salters, and O. H. Willemsen, “LED-based mini-projectors,” presented at the Photonics in Multimedia Conference, Strasbourg, France, 3-7 April 2006.
  9. H. Murat, D. Cuypers, and H. De Smet, “Design of new collection systems for multi LED light engines,” presented at the Photonics in Multimedia Conference, Strasbourg, France, 3-7 April 2006.
  10. S. Ohuchi, T. Miyoshi, T. Imahase, T. Nakashima, and K. Shikita, “Ultra portable LCOS projector with high-performance optical system,” IEEE Trans. Cons. Electron. 48, 388-393(2002).
  11. J.-W. Pan, C.-M. Wang, W.-S. Sun, and J.-Y. Chang, “Portable digital micromirror device projector using a prism,” Appl. Opt. 46, 5097-5102 (2007).
    [CrossRef]
  12. I. Moreno, “Spatial distribution of LED radiation,” Proc. SPIE 6342, 634216 (2006).
  13. W. Falicoff, J. Chaves, and B. Parkyn, “PC-LED luminance enhancement due to phosphor scattering,” presented at the Nonimaging Optics and Efficient Illumination Systems II Conference, San Diego, Calif. 31 July-1 August 2005.
  14. E. Peli, “Contrast sensitivity function and image discrimination,” J. Opt. Soc. Am. A 18, 283-293 (2001).
    [CrossRef]
  15. R. Winston, J. C. Minano, P. Benitez, and W. T. Welford, Nonimaging Optics (Elsevier Academic, 2005), pp. xi, 497.
  16. W. J. Cassarly, “Nonimaging optics: concentration and illumination,” in Handbook of Optics, 2nd ed. (McGraw-Hill, 1995).
  17. L. A. Whitehead and M. A. Mossman, “Off the beaten path with total internal reflection,” Proc. SPIE 6342, 63420U(2006).
  18. L. A. Piegl and W. Tiller, The NURBS Book, 2nd ed. (Springer, 1997), pp. xiv, 646.
  19. X. Ning, R. Winston, and J. O'Gallagher, “Dielectric totally internally reflecting concentrators,” Appl. Opt. 26, 300-305(1987).
  20. J. Rodgers, “Slope error tolerances for optical surfaces,” presented at the SPIE Optifab Conference, Rochester, N.Y., 15-17 May 2007.

2008 (1)

2007 (2)

2006 (3)

J. M. Teijido, F. Ludley, O. Ripoll, M. Ueda, Y. Oshima, T. Yoshida, K. Toyota, K. Yamamoto, T. Nagara, Y. Kato, A. Wajiki, and S. Umeya, “73.2: compact three panel LED projector engine for portable applications,” SID Int. Symp. Digest Tech. Papers (2006).

I. Moreno, “Spatial distribution of LED radiation,” Proc. SPIE 6342, 634216 (2006).

L. A. Whitehead and M. A. Mossman, “Off the beaten path with total internal reflection,” Proc. SPIE 6342, 63420U(2006).

2004 (1)

M. H. Keuper, G. Harbers, and S. Paolini, “26.1: RGB LED illuminator for pocket-sized projectors,” SID Int. Symp. Digest Tech. Papers 35, 943-945 (2004).

2002 (1)

S. Ohuchi, T. Miyoshi, T. Imahase, T. Nakashima, and K. Shikita, “Ultra portable LCOS projector with high-performance optical system,” IEEE Trans. Cons. Electron. 48, 388-393(2002).

2001 (1)

1987 (1)

Appl. Opt. (2)

IEEE Trans. Cons. Electron. (1)

S. Ohuchi, T. Miyoshi, T. Imahase, T. Nakashima, and K. Shikita, “Ultra portable LCOS projector with high-performance optical system,” IEEE Trans. Cons. Electron. 48, 388-393(2002).

J. Display Technol. (2)

J. Opt. Soc. Am. A (1)

LEDs Magazine (1)

R. Karlicek, “Photonic Lattice LEDs are new class of light-emitting device,” LEDs Magazine , 20-23 (August 2007).

Proc. SPIE (2)

L. A. Whitehead and M. A. Mossman, “Off the beaten path with total internal reflection,” Proc. SPIE 6342, 63420U(2006).

I. Moreno, “Spatial distribution of LED radiation,” Proc. SPIE 6342, 634216 (2006).

SID Int. Symp. Digest Tech. Papers (2)

M. H. Keuper, G. Harbers, and S. Paolini, “26.1: RGB LED illuminator for pocket-sized projectors,” SID Int. Symp. Digest Tech. Papers 35, 943-945 (2004).

J. M. Teijido, F. Ludley, O. Ripoll, M. Ueda, Y. Oshima, T. Yoshida, K. Toyota, K. Yamamoto, T. Nagara, Y. Kato, A. Wajiki, and S. Umeya, “73.2: compact three panel LED projector engine for portable applications,” SID Int. Symp. Digest Tech. Papers (2006).

Other (9)

E. Geissler, “Meeting the challenges of developing LED-based projection displays,” presented at the Photonics in Multimedia Conference, Strasbourg, France, 3-7 April 2006.

R. Winston, J. C. Minano, P. Benitez, and W. T. Welford, Nonimaging Optics (Elsevier Academic, 2005), pp. xi, 497.

W. J. Cassarly, “Nonimaging optics: concentration and illumination,” in Handbook of Optics, 2nd ed. (McGraw-Hill, 1995).

E. H. Stupp and M. S. Brennesholtz, Projection displays, Wiley SID series in display technology (Wiley, 1999), pp. xviii, 418.

M. P. Krijn, B. A. Salters, and O. H. Willemsen, “LED-based mini-projectors,” presented at the Photonics in Multimedia Conference, Strasbourg, France, 3-7 April 2006.

H. Murat, D. Cuypers, and H. De Smet, “Design of new collection systems for multi LED light engines,” presented at the Photonics in Multimedia Conference, Strasbourg, France, 3-7 April 2006.

W. Falicoff, J. Chaves, and B. Parkyn, “PC-LED luminance enhancement due to phosphor scattering,” presented at the Nonimaging Optics and Efficient Illumination Systems II Conference, San Diego, Calif. 31 July-1 August 2005.

J. Rodgers, “Slope error tolerances for optical surfaces,” presented at the SPIE Optifab Conference, Rochester, N.Y., 15-17 May 2007.

L. A. Piegl and W. Tiller, The NURBS Book, 2nd ed. (Springer, 1997), pp. xiv, 646.

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