Abstract

We present a light emitting diode (LED)-based ultramini digital micromirror device projector with a size of 75mm×67mm×42mm and a weight of 338g. The LED illuminator inside this projector makes it possible to achieve a volume of 18cm3 by using a dichroic filter and a collimating lens. The illumination system consists of high uniformity of 93% through a microlens array as a homogenizer. A total internal reflection prism is also used to reduce the size of both the illumination system and the telecentric projection lens. A projection lens system with an ultrasmall track of 42mm, including a high modulation transfer function value of 0.4 at 46.2  line pairs/mm, an optical distortion of only 0.25 %, and a television distortion of 0.01%, is designed. Through the above superior specification, we can produce a 20in. (51cm) color display comparable in brightness to a laptop with a contrast of 3700:1. The device is compact and suitable for personal use.

© 2008 Optical Society of America

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References

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  1. G. Harbers, M. Keuper, and S. Paolini, “Performance of high power LED illuminators in color sequential projection displays,” in Proceedings of the Tenth International Display Workshops (Society for Information Display, 2003), pp. 1585-1588.
  2. G. Harbers, M. Keuper, and S. Paolini, “High power LED illuminators for data and video projectors,” in Proceedings of the Ninth International Display Workshops (Society for Information Display, 2002), pp. 501-504.
  3. M. H. Keuper, G. Harbers, and S. Paolini, “RGB LED illuminator for pocket-sized projectors,” in Vol. 35 of SID Symposium Digest of Technical Papers (Society of Information Display, 2004), pp. 943-945.
    [CrossRef]
  4. M. P. Krijn, B. A. Salters, and O. H. Willemsen, “LED-based mini projector,” Proc. SPIE 6196, 619602 (2006).
    [CrossRef]
  5. E. Geissler, “Meeting the challenges of developing LED-based projection display,” Proc. SPIE 6196, 619601 (2006).
    [CrossRef]
  6. G. Benedix and E. Piehler, “Projection objective,” U.S. patent 6,844,984 (3 January 2005).
  7. E. H. Stupp and M. S. Brennesholtz, Projection Display (Wiley, 1999).
  8. H. Murat, D. Cuypers, and H. D. Smet, “Design of new collection systems for multi LED light engines,” Proc. SPIE. 6196, 619604 (2006).
    [CrossRef]
  9. Y. C. Fang, W. T. Lin, and H. L. Tsai, “High definition DLP zoom projection lens design with TIR prism for high definition television (HDTV),” Proc. SPIE 6342, 63420Z (2006).
    [CrossRef]
  10. J. W. Pan, C. M. Wang, W. S. Sun, and J. Y. Chang, “Portable digital micromirror device projector using a novel prim,” Appl. Opt. 46, 5097-5102 (2007).
    [CrossRef] [PubMed]
  11. J. W. Pan, C. M. Wang, H. C. Lain, W. S. Sun, and J. Y. Chang, “Homogenized LED-illumination using microlens arrays for a pocket-sized projector,” Opt. Express 15, 10483-10491 (2007).
    [CrossRef] [PubMed]
  12. Breault Research Organization, http://www.breault.com.
  13. Optical Research Associates, http://www.opticalres.com.
  14. OSTAR Projection at OSRAM Opto Semiconductors, www.orsam-os.com.
  15. Advanced System Analysis Program technical guide, Edge in ASAP, http://www.breault.com/k-base.php?kbaseID=29&catID=44&page=1//www.breault.com.
  16. B. V. Giel, Y. Meuret, and H. Thienpont, “Design axisymmetrical tailored concentrator of LED light source application,” Proc. SPIE 6196, 619603-1 (2006).
  17. J. W. Bowron and R. P. Jonas, “Off-axis illumination design for DMD systems,” Proc. SPIE 5186, 72-82 (2003).
    [CrossRef]
  18. W. J. Smith, Modern Optical Engneering, 3rd ed. (McGraw Hill, 2001), pp. 468-469.
  19. M. J. Kidger, Fundamental Optical Design, Press Monograph Vol. PM92 (SPIE Press, 2001), p. 159.
  20. W. J. Smith, Modern Optical Engneering, 3rd ed. (McGraw Hill2001), p. 420.
  21. W. J. Smith, Modern Optical Engneering, 3rd ed. (McGraw Hill2001), p. 71.
  22. R. E. Fisher and B. Tadic-Galeb, Optical System Design (McGraw Hill, 2000).
  23. X. Zhao, Z. L. Fang, J. C. Cui, X. Zhang, and G. G. Mu, “Illumination system using LED light sources for pocket-size projector,” Appl. Opt. 46, 522-526 (2007).
    [CrossRef] [PubMed]
  24. G. Wyszecki and W. S. Stiles, Color Science: Concepts and Methods, Quantitative Data and Formulae, 2nd ed. (Wiley, 1982).
  25. A. Csaszar, “Data projection equipment and large-screen data displays, test, and performance measurements,” in SID 1991 Digest (1991), pp. 265-267.
  26. E. Piehler, “System in which light is directed from a light source onto a surface,” U.S. patent 6,439,726 (27 August 2002).

2007 (3)

2006 (5)

B. V. Giel, Y. Meuret, and H. Thienpont, “Design axisymmetrical tailored concentrator of LED light source application,” Proc. SPIE 6196, 619603-1 (2006).

M. P. Krijn, B. A. Salters, and O. H. Willemsen, “LED-based mini projector,” Proc. SPIE 6196, 619602 (2006).
[CrossRef]

E. Geissler, “Meeting the challenges of developing LED-based projection display,” Proc. SPIE 6196, 619601 (2006).
[CrossRef]

H. Murat, D. Cuypers, and H. D. Smet, “Design of new collection systems for multi LED light engines,” Proc. SPIE. 6196, 619604 (2006).
[CrossRef]

Y. C. Fang, W. T. Lin, and H. L. Tsai, “High definition DLP zoom projection lens design with TIR prism for high definition television (HDTV),” Proc. SPIE 6342, 63420Z (2006).
[CrossRef]

2003 (1)

J. W. Bowron and R. P. Jonas, “Off-axis illumination design for DMD systems,” Proc. SPIE 5186, 72-82 (2003).
[CrossRef]

Benedix, G.

G. Benedix and E. Piehler, “Projection objective,” U.S. patent 6,844,984 (3 January 2005).

Bowron, J. W.

J. W. Bowron and R. P. Jonas, “Off-axis illumination design for DMD systems,” Proc. SPIE 5186, 72-82 (2003).
[CrossRef]

Brennesholtz, M. S.

E. H. Stupp and M. S. Brennesholtz, Projection Display (Wiley, 1999).

Chang, J. Y.

Csaszar, A.

A. Csaszar, “Data projection equipment and large-screen data displays, test, and performance measurements,” in SID 1991 Digest (1991), pp. 265-267.

Cui, J. C.

Cuypers, D.

H. Murat, D. Cuypers, and H. D. Smet, “Design of new collection systems for multi LED light engines,” Proc. SPIE. 6196, 619604 (2006).
[CrossRef]

Fang, Y. C.

Y. C. Fang, W. T. Lin, and H. L. Tsai, “High definition DLP zoom projection lens design with TIR prism for high definition television (HDTV),” Proc. SPIE 6342, 63420Z (2006).
[CrossRef]

Fang, Z. L.

Fisher, R. E.

R. E. Fisher and B. Tadic-Galeb, Optical System Design (McGraw Hill, 2000).

Geissler, E.

E. Geissler, “Meeting the challenges of developing LED-based projection display,” Proc. SPIE 6196, 619601 (2006).
[CrossRef]

Giel, B. V.

B. V. Giel, Y. Meuret, and H. Thienpont, “Design axisymmetrical tailored concentrator of LED light source application,” Proc. SPIE 6196, 619603-1 (2006).

Harbers, G.

G. Harbers, M. Keuper, and S. Paolini, “Performance of high power LED illuminators in color sequential projection displays,” in Proceedings of the Tenth International Display Workshops (Society for Information Display, 2003), pp. 1585-1588.

G. Harbers, M. Keuper, and S. Paolini, “High power LED illuminators for data and video projectors,” in Proceedings of the Ninth International Display Workshops (Society for Information Display, 2002), pp. 501-504.

M. H. Keuper, G. Harbers, and S. Paolini, “RGB LED illuminator for pocket-sized projectors,” in Vol. 35 of SID Symposium Digest of Technical Papers (Society of Information Display, 2004), pp. 943-945.
[CrossRef]

Jonas, R. P.

J. W. Bowron and R. P. Jonas, “Off-axis illumination design for DMD systems,” Proc. SPIE 5186, 72-82 (2003).
[CrossRef]

Keuper, M.

G. Harbers, M. Keuper, and S. Paolini, “High power LED illuminators for data and video projectors,” in Proceedings of the Ninth International Display Workshops (Society for Information Display, 2002), pp. 501-504.

G. Harbers, M. Keuper, and S. Paolini, “Performance of high power LED illuminators in color sequential projection displays,” in Proceedings of the Tenth International Display Workshops (Society for Information Display, 2003), pp. 1585-1588.

Keuper, M. H.

M. H. Keuper, G. Harbers, and S. Paolini, “RGB LED illuminator for pocket-sized projectors,” in Vol. 35 of SID Symposium Digest of Technical Papers (Society of Information Display, 2004), pp. 943-945.
[CrossRef]

Kidger, M. J.

M. J. Kidger, Fundamental Optical Design, Press Monograph Vol. PM92 (SPIE Press, 2001), p. 159.

Krijn, M. P.

M. P. Krijn, B. A. Salters, and O. H. Willemsen, “LED-based mini projector,” Proc. SPIE 6196, 619602 (2006).
[CrossRef]

Lain, H. C.

Lin, W. T.

Y. C. Fang, W. T. Lin, and H. L. Tsai, “High definition DLP zoom projection lens design with TIR prism for high definition television (HDTV),” Proc. SPIE 6342, 63420Z (2006).
[CrossRef]

Meuret, Y.

B. V. Giel, Y. Meuret, and H. Thienpont, “Design axisymmetrical tailored concentrator of LED light source application,” Proc. SPIE 6196, 619603-1 (2006).

Mu, G. G.

Murat, H.

H. Murat, D. Cuypers, and H. D. Smet, “Design of new collection systems for multi LED light engines,” Proc. SPIE. 6196, 619604 (2006).
[CrossRef]

Pan, J. W.

Paolini, S.

M. H. Keuper, G. Harbers, and S. Paolini, “RGB LED illuminator for pocket-sized projectors,” in Vol. 35 of SID Symposium Digest of Technical Papers (Society of Information Display, 2004), pp. 943-945.
[CrossRef]

G. Harbers, M. Keuper, and S. Paolini, “Performance of high power LED illuminators in color sequential projection displays,” in Proceedings of the Tenth International Display Workshops (Society for Information Display, 2003), pp. 1585-1588.

G. Harbers, M. Keuper, and S. Paolini, “High power LED illuminators for data and video projectors,” in Proceedings of the Ninth International Display Workshops (Society for Information Display, 2002), pp. 501-504.

Piehler, E.

G. Benedix and E. Piehler, “Projection objective,” U.S. patent 6,844,984 (3 January 2005).

E. Piehler, “System in which light is directed from a light source onto a surface,” U.S. patent 6,439,726 (27 August 2002).

Salters, B. A.

M. P. Krijn, B. A. Salters, and O. H. Willemsen, “LED-based mini projector,” Proc. SPIE 6196, 619602 (2006).
[CrossRef]

Smet, H. D.

H. Murat, D. Cuypers, and H. D. Smet, “Design of new collection systems for multi LED light engines,” Proc. SPIE. 6196, 619604 (2006).
[CrossRef]

Smith, W. J.

W. J. Smith, Modern Optical Engneering, 3rd ed. (McGraw Hill2001), p. 420.

W. J. Smith, Modern Optical Engneering, 3rd ed. (McGraw Hill2001), p. 71.

W. J. Smith, Modern Optical Engneering, 3rd ed. (McGraw Hill, 2001), pp. 468-469.

Stiles, W. S.

G. Wyszecki and W. S. Stiles, Color Science: Concepts and Methods, Quantitative Data and Formulae, 2nd ed. (Wiley, 1982).

Stupp, E. H.

E. H. Stupp and M. S. Brennesholtz, Projection Display (Wiley, 1999).

Sun, W. S.

Tadic-Galeb, B.

R. E. Fisher and B. Tadic-Galeb, Optical System Design (McGraw Hill, 2000).

Thienpont, H.

B. V. Giel, Y. Meuret, and H. Thienpont, “Design axisymmetrical tailored concentrator of LED light source application,” Proc. SPIE 6196, 619603-1 (2006).

Tsai, H. L.

Y. C. Fang, W. T. Lin, and H. L. Tsai, “High definition DLP zoom projection lens design with TIR prism for high definition television (HDTV),” Proc. SPIE 6342, 63420Z (2006).
[CrossRef]

Wang, C. M.

Willemsen, O. H.

M. P. Krijn, B. A. Salters, and O. H. Willemsen, “LED-based mini projector,” Proc. SPIE 6196, 619602 (2006).
[CrossRef]

Wyszecki, G.

G. Wyszecki and W. S. Stiles, Color Science: Concepts and Methods, Quantitative Data and Formulae, 2nd ed. (Wiley, 1982).

Zhang, X.

Zhao, X.

Appl. Opt. (2)

Opt. Express (1)

Proc. SPIE (5)

B. V. Giel, Y. Meuret, and H. Thienpont, “Design axisymmetrical tailored concentrator of LED light source application,” Proc. SPIE 6196, 619603-1 (2006).

J. W. Bowron and R. P. Jonas, “Off-axis illumination design for DMD systems,” Proc. SPIE 5186, 72-82 (2003).
[CrossRef]

M. P. Krijn, B. A. Salters, and O. H. Willemsen, “LED-based mini projector,” Proc. SPIE 6196, 619602 (2006).
[CrossRef]

E. Geissler, “Meeting the challenges of developing LED-based projection display,” Proc. SPIE 6196, 619601 (2006).
[CrossRef]

Y. C. Fang, W. T. Lin, and H. L. Tsai, “High definition DLP zoom projection lens design with TIR prism for high definition television (HDTV),” Proc. SPIE 6342, 63420Z (2006).
[CrossRef]

Proc. SPIE. (1)

H. Murat, D. Cuypers, and H. D. Smet, “Design of new collection systems for multi LED light engines,” Proc. SPIE. 6196, 619604 (2006).
[CrossRef]

Other (17)

G. Harbers, M. Keuper, and S. Paolini, “Performance of high power LED illuminators in color sequential projection displays,” in Proceedings of the Tenth International Display Workshops (Society for Information Display, 2003), pp. 1585-1588.

G. Harbers, M. Keuper, and S. Paolini, “High power LED illuminators for data and video projectors,” in Proceedings of the Ninth International Display Workshops (Society for Information Display, 2002), pp. 501-504.

M. H. Keuper, G. Harbers, and S. Paolini, “RGB LED illuminator for pocket-sized projectors,” in Vol. 35 of SID Symposium Digest of Technical Papers (Society of Information Display, 2004), pp. 943-945.
[CrossRef]

G. Benedix and E. Piehler, “Projection objective,” U.S. patent 6,844,984 (3 January 2005).

E. H. Stupp and M. S. Brennesholtz, Projection Display (Wiley, 1999).

W. J. Smith, Modern Optical Engneering, 3rd ed. (McGraw Hill, 2001), pp. 468-469.

M. J. Kidger, Fundamental Optical Design, Press Monograph Vol. PM92 (SPIE Press, 2001), p. 159.

W. J. Smith, Modern Optical Engneering, 3rd ed. (McGraw Hill2001), p. 420.

W. J. Smith, Modern Optical Engneering, 3rd ed. (McGraw Hill2001), p. 71.

R. E. Fisher and B. Tadic-Galeb, Optical System Design (McGraw Hill, 2000).

Breault Research Organization, http://www.breault.com.

Optical Research Associates, http://www.opticalres.com.

OSTAR Projection at OSRAM Opto Semiconductors, www.orsam-os.com.

Advanced System Analysis Program technical guide, Edge in ASAP, http://www.breault.com/k-base.php?kbaseID=29&catID=44&page=1//www.breault.com.

G. Wyszecki and W. S. Stiles, Color Science: Concepts and Methods, Quantitative Data and Formulae, 2nd ed. (Wiley, 1982).

A. Csaszar, “Data projection equipment and large-screen data displays, test, and performance measurements,” in SID 1991 Digest (1991), pp. 265-267.

E. Piehler, “System in which light is directed from a light source onto a surface,” U.S. patent 6,439,726 (27 August 2002).

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Figures (11)

Fig. 1
Fig. 1

Design layout of the ultracompact projector.

Fig. 2
Fig. 2

(a) Five Bezier curves. (b) Collimating lens layout in the ASAP. (c) Actual collimating lens system.

Fig. 3
Fig. 3

Light intensity distribution after passing through the collimating lens.

Fig. 4
Fig. 4

Collecting efficiency versus vertical angle of the collimating lens.

Fig. 5
Fig. 5

Layout of the telecentric lens with nine elements and short total track of the projection lens.

Fig. 6
Fig. 6

MTF diagram.

Fig. 7
Fig. 7

(a) Spot diagram. (b) Ray fan plots for the projection lens. (c) Lateral color plots.

Fig. 8
Fig. 8

(a) Definition of the TV distortion and (b) the TV distortion layout.

Fig. 9
Fig. 9

Field curve and optical distortion.

Fig. 10
Fig. 10

Color gamut of the miniprojector.

Fig. 11
Fig. 11

Illumination distribution at (a) the DMD and (b) the screen.

Tables (4)

Tables Icon

Table 1 Optical Specification for Projection Lens

Tables Icon

Table 2 Étendue and Maximum Collecting Efficiency

Tables Icon

Table 3 Color Coordination for a Miniprojector and Standard sRGB

Tables Icon

Table 4 Comparison of Miniprojectors

Equations (2)

Equations on this page are rendered with MathJax. Learn more.

Petzval sum P C = h 2 2 ϕ n ,
E = n 2 cos ϑ · d A · d Ω = π A · sin θ 2 ,

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