Abstract

We provide a novel achromatic design in the illumination system for a mini projector with an LED light source. The lateral color aberration at the corners of the DMD active area can be reduced to 0.48 μm by our compact ATIR prism. The total prism size is 4091 mm3. The spot sizes at the corner and the edge are also controlled under 198 μm. Moreover, we use a light pipe for color uniformity at the center of the DMD active area. Under the two components for color uniformity, the Δu’ v’ is well controlled under 0.016 by a 20 mm length of light pipe. The illuminance uniformity at the active area of the DMD chip is higher than 92.8%. The optical efficiency of the light pipe is 94.1%.

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References

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  1. E. F. Schubert and J. K. Kim, “Solid-state light sources getting smart,” Science 308(5726), 1274–1278 (2005).
    [CrossRef] [PubMed]
  2. Texas Instruments (TI), “DLP® Discovery Optics 101 Application Note,” http://focus.ti.com/lit/an/dlpa022/dlpa022.pdf .
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    [CrossRef]
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    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
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  8. M. H. Keuper, G. Harbers, and S. Paolini, “RGB LED Illuminator for Pocket-sized Projectors,” in International Symposium Digest of Technical Papers (SID ’04), 943–945 (2004).
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    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
  14. Zemax, http://www.zemax.com/ .
  15. Ohara Corporation, “Optical Glass Cross Reference Sheet, http://www.oharacorp.com/catalog.html .
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  17. OSRAM, “ LE_A_LE_T_LE_B_S2W,” http://catalog.osram-os.com/catalogue/catalogue.do?favOid=0000000400036fee03110023&act=showBookmark .
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  19. W. J. Smith, “Prism and Mirror Systems,” in Modern Optical Engineering, 4th ed. (McGraw-Hill, 2008), pp. 619–621.

2008 (1)

2007 (4)

2006 (1)

M. Huseyin, C. Dieter, and D. S. Herbert, “Design of new collection systems for multi LED light engines,” Proc. SPIE 6196, 19604 (2006).

2005 (1)

E. F. Schubert and J. K. Kim, “Solid-state light sources getting smart,” Science 308(5726), 1274–1278 (2005).
[CrossRef] [PubMed]

2000 (1)

Bogaert, L.

H. Murat, D. Cuypers, H. De Smet, Y. Meuret, B. Van Giel, L. Bogaert, and H. Thienpont, “Two liquid crystal on silicon panel projector with efficient light-emitting diode illumination,” Opt. Eng. 46(12), 124002 (2007).
[CrossRef]

Chang, C.-M.

Chang, J. Y.

Chang, J.-Y.

Cui, J.-C.

Cuypers, D.

H. Murat, D. Cuypers, H. De Smet, Y. Meuret, B. Van Giel, L. Bogaert, and H. Thienpont, “Two liquid crystal on silicon panel projector with efficient light-emitting diode illumination,” Opt. Eng. 46(12), 124002 (2007).
[CrossRef]

De Smet, H.

H. Murat, D. Cuypers, H. De Smet, Y. Meuret, B. Van Giel, L. Bogaert, and H. Thienpont, “Two liquid crystal on silicon panel projector with efficient light-emitting diode illumination,” Opt. Eng. 46(12), 124002 (2007).
[CrossRef]

Dieter, C.

M. Huseyin, C. Dieter, and D. S. Herbert, “Design of new collection systems for multi LED light engines,” Proc. SPIE 6196, 19604 (2006).

Fang, Z.-L.

Herbert, D. S.

M. Huseyin, C. Dieter, and D. S. Herbert, “Design of new collection systems for multi LED light engines,” Proc. SPIE 6196, 19604 (2006).

Huseyin, M.

M. Huseyin, C. Dieter, and D. S. Herbert, “Design of new collection systems for multi LED light engines,” Proc. SPIE 6196, 19604 (2006).

Kim, J. K.

E. F. Schubert and J. K. Kim, “Solid-state light sources getting smart,” Science 308(5726), 1274–1278 (2005).
[CrossRef] [PubMed]

Lan, H. C.

Meuret, Y.

H. Murat, D. Cuypers, H. De Smet, Y. Meuret, B. Van Giel, L. Bogaert, and H. Thienpont, “Two liquid crystal on silicon panel projector with efficient light-emitting diode illumination,” Opt. Eng. 46(12), 124002 (2007).
[CrossRef]

Mu, G.-G.

Murat, H.

H. Murat, D. Cuypers, H. De Smet, Y. Meuret, B. Van Giel, L. Bogaert, and H. Thienpont, “Two liquid crystal on silicon panel projector with efficient light-emitting diode illumination,” Opt. Eng. 46(12), 124002 (2007).
[CrossRef]

Pan, J. W.

Pan, J.-W.

Schubert, E. F.

E. F. Schubert and J. K. Kim, “Solid-state light sources getting smart,” Science 308(5726), 1274–1278 (2005).
[CrossRef] [PubMed]

Shieh, H.-P. D.

Sun, W. S.

Thienpont, H.

H. Murat, D. Cuypers, H. De Smet, Y. Meuret, B. Van Giel, L. Bogaert, and H. Thienpont, “Two liquid crystal on silicon panel projector with efficient light-emitting diode illumination,” Opt. Eng. 46(12), 124002 (2007).
[CrossRef]

Tu, S.-H.

Van Giel, B.

H. Murat, D. Cuypers, H. De Smet, Y. Meuret, B. Van Giel, L. Bogaert, and H. Thienpont, “Two liquid crystal on silicon panel projector with efficient light-emitting diode illumination,” Opt. Eng. 46(12), 124002 (2007).
[CrossRef]

Wang, C. M.

Wang, C.-M.

Zhang, X.

Zhao, X.

Appl. Opt. (4)

Opt. Eng. (1)

H. Murat, D. Cuypers, H. De Smet, Y. Meuret, B. Van Giel, L. Bogaert, and H. Thienpont, “Two liquid crystal on silicon panel projector with efficient light-emitting diode illumination,” Opt. Eng. 46(12), 124002 (2007).
[CrossRef]

Opt. Express (1)

Proc. SPIE (1)

M. Huseyin, C. Dieter, and D. S. Herbert, “Design of new collection systems for multi LED light engines,” Proc. SPIE 6196, 19604 (2006).

Science (1)

E. F. Schubert and J. K. Kim, “Solid-state light sources getting smart,” Science 308(5726), 1274–1278 (2005).
[CrossRef] [PubMed]

Other (11)

Texas Instruments (TI), “DLP® Discovery Optics 101 Application Note,” http://focus.ti.com/lit/an/dlpa022/dlpa022.pdf .

G. Harbers, M. Keuper, and S. Paolini, “Performance of high power LED illuminators in color sequential projection displays,” in Proceedings of Internal Display Workshop (IDW 2003).

G. Harbers, M. Keuper, and S. Paolini, “High power LED illuminators for data and video projector,” in Proceedings of Internal Display Workshop (IDW 2002).

M. H. Keuper, G. Harbers, and S. Paolini, “RGB LED Illuminator for Pocket-sized Projectors,” in International Symposium Digest of Technical Papers (SID ’04), 943–945 (2004).

Zemax, http://www.zemax.com/ .

Ohara Corporation, “Optical Glass Cross Reference Sheet, http://www.oharacorp.com/catalog.html .

G. W. Wyszecki and W. S. Stiles, Color Science: Concepts and Methods, Quantitative data and Formulae, (John Wiley & Sons, 1982).

OSRAM, “ LE_A_LE_T_LE_B_S2W,” http://catalog.osram-os.com/catalogue/catalogue.do?favOid=0000000400036fee03110023&act=showBookmark .

LightTools, http://www.opticalres.com/ .

W. J. Smith, “Prism and Mirror Systems,” in Modern Optical Engineering, 4th ed. (McGraw-Hill, 2008), pp. 619–621.

E. H. Stupp and M. S. Brennesholtz, Projection Display, (Wiley, 2008).

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Figures (9)

Fig. 1
Fig. 1

Structure of the ATIR prisms with deferent materials.

Fig. 2
Fig. 2

Relation between lateral color aberration, prism size, and incident angle (θin).

Fig. 3
Fig. 3

Spot size on the DMD active area and the prism size for a series of incident angle (θin). (a) Spot size of SK16. (b) Spot size of SF2. (c) Spot size of LAK8. (d) Spot size of SF57.

Fig. 4
Fig. 4

Efficiency and illuminance uniformity.

Fig. 5
Fig. 5

Efficiency and average Δu’ v’.

Fig. 6
Fig. 6

Schematic diagram for the mini projector with LED light source.

Fig. 7
Fig. 7

Illuminance chart at the DMD active area.

Fig. 8
Fig. 8

Tolerance for illumination uniformity.

Fig. 9
Fig. 9

Tolerance for the average Δu’ v’.

Tables (1)

Tables Icon

Table 1 Comparison for Novel ATIR Prism with Different Material

Equations (5)

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

sin θ i n = n a sin { sin 1 [ n b n a sin ( 45 sin 1 sin θ D M D n b ) ] A } .
O v e r F i l l e d E f f i c i e n c y = F a c t i v e F D M D × 100 % ,
A v e r a g e ( Δ u v ) = i = 1 9 ( u i u r e f ) 2 + ( v i v r e f ) 2 9 ,
Illuminance    U n i f o r m i t y = L min L max × 100 % ,
O p t i c a l    E f f i c i e n c y   o f   L i g h t   P i p e = F o u t p u t F i n p u t × 100 % .

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