Abstract

A newly designed ultrasmall total internal reflection prism with a size of 29  mm×22   mm×24   mm and weight of 19 .5   g is proposed for use in a pocket-sized Digital Micromirror Device projector. The entire projector, including an arc lamp illumination, relay, and projection system, has a height of 48   mm and a footprint of 80   mm×132   mm. By using an overdriving f/2 .0 projection lens, the geometric efficiency of the projection system, ηgeo-pro, can be enhanced from 80% to 92%. Although, at the same time, the contrast decreased from 1200:1 to 500:1, this can be enhanced using an off-axis stop. By tuning the position of the stop, the contrast can be as high as 3700:1 for a ηgeo-pro equal to 90%. Using what we believe to be a novel prism design, we can get a very compact optical system with a high efficiency and good contrast ratio.

© 2007 Optical Society of America

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References

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  1. L. J. Hornbeck, "Digital light processing for high-brightness, high-resolution applications," in Projection Displays III, M. H. Wu, ed., Proc. SPIE 3013, 27-40 (1997).
    [CrossRef]
  2. G. H. Moss, R. G. Fielding, M. Kavanagh, and B. R. Critchley, "A high-luminance large-screen projection system using the digital micromirror device (DMD)," in SID '96 International Symposium Digest of Technical Papers (Society for Information Display, 1996), pp. 907-910.
  3. H. C. Burstyn, D. Meyerhofer, and P. M. Heyman, "The design of high-efficiency high-resolution projectors with the digital micromirror device," in SID '94 International Symposium Digest of Technical Papers (Society for Information Display, 1994), pp. 677-680.
  4. P. M. Alt, "Single crystal silicon for high resolution displays," in Proceedings of the Seventeenth International Display Research Conference, Society for Information Display, Santa Ana, Calif., 19-28 (1997).
  5. J. W. Bowron and R. P. Jonas, "Off-axis illumination design for DMD systems," Proc. SPIE 5186, 72-82 (2003).
    [CrossRef]
  6. C.-M. Chang and H.-P. D. Shieh, "Design of illumination and projection optics for projectors with single digital micromirror devices," Appl. Opt. 39, 3202-3208 (2000).
    [CrossRef]
  7. E. H. Stupp and M. S. Brennesholtz, Projection displays (Wiley, 1999).
  8. D. S. Dewald, D. J. Segler, and S. M. Penn, "Advances in contrast enhancement for DLP projection displays," J. Soc. Inf. Disp. 11, 177-181 (2003).
    [CrossRef]
  9. Y. Meuret and P. De Visschere, "Contrast-improving methods for Digital Micromirror Device projectors," Opt. Eng. 42, 840-845 (2003).
    [CrossRef]
  10. Radiant Imaging Inc. website http://www.radimg.com.
  11. ZEMAX Development Corp., website http://www.zemax.com.
  12. 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).

2006 (1)

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).

2003 (3)

D. S. Dewald, D. J. Segler, and S. M. Penn, "Advances in contrast enhancement for DLP projection displays," J. Soc. Inf. Disp. 11, 177-181 (2003).
[CrossRef]

Y. Meuret and P. De Visschere, "Contrast-improving methods for Digital Micromirror Device projectors," Opt. Eng. 42, 840-845 (2003).
[CrossRef]

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

2000 (1)

1999 (1)

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

1997 (2)

L. J. Hornbeck, "Digital light processing for high-brightness, high-resolution applications," in Projection Displays III, M. H. Wu, ed., Proc. SPIE 3013, 27-40 (1997).
[CrossRef]

P. M. Alt, "Single crystal silicon for high resolution displays," in Proceedings of the Seventeenth International Display Research Conference, Society for Information Display, Santa Ana, Calif., 19-28 (1997).

Alt, P. M.

P. M. Alt, "Single crystal silicon for high resolution displays," in Proceedings of the Seventeenth International Display Research Conference, Society for Information Display, Santa Ana, Calif., 19-28 (1997).

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 displays (Wiley, 1999).

Burstyn, H. C.

H. C. Burstyn, D. Meyerhofer, and P. M. Heyman, "The design of high-efficiency high-resolution projectors with the digital micromirror device," in SID '94 International Symposium Digest of Technical Papers (Society for Information Display, 1994), pp. 677-680.

Chang, C.-M.

Critchley, B. R.

G. H. Moss, R. G. Fielding, M. Kavanagh, and B. R. Critchley, "A high-luminance large-screen projection system using the digital micromirror device (DMD)," in SID '96 International Symposium Digest of Technical Papers (Society for Information Display, 1996), pp. 907-910.

De Visschere, P.

Y. Meuret and P. De Visschere, "Contrast-improving methods for Digital Micromirror Device projectors," Opt. Eng. 42, 840-845 (2003).
[CrossRef]

Dewald, D. S.

D. S. Dewald, D. J. Segler, and S. M. Penn, "Advances in contrast enhancement for DLP projection displays," J. Soc. Inf. Disp. 11, 177-181 (2003).
[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).

Fielding, R. G.

G. H. Moss, R. G. Fielding, M. Kavanagh, and B. R. Critchley, "A high-luminance large-screen projection system using the digital micromirror device (DMD)," in SID '96 International Symposium Digest of Technical Papers (Society for Information Display, 1996), pp. 907-910.

Heyman, P. M.

H. C. Burstyn, D. Meyerhofer, and P. M. Heyman, "The design of high-efficiency high-resolution projectors with the digital micromirror device," in SID '94 International Symposium Digest of Technical Papers (Society for Information Display, 1994), pp. 677-680.

Hornbeck, L. J.

L. J. Hornbeck, "Digital light processing for high-brightness, high-resolution applications," in Projection Displays III, M. H. Wu, ed., Proc. SPIE 3013, 27-40 (1997).
[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]

Kavanagh, M.

G. H. Moss, R. G. Fielding, M. Kavanagh, and B. R. Critchley, "A high-luminance large-screen projection system using the digital micromirror device (DMD)," in SID '96 International Symposium Digest of Technical Papers (Society for Information Display, 1996), pp. 907-910.

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).

Meuret, Y.

Y. Meuret and P. De Visschere, "Contrast-improving methods for Digital Micromirror Device projectors," Opt. Eng. 42, 840-845 (2003).
[CrossRef]

Meyerhofer, D.

H. C. Burstyn, D. Meyerhofer, and P. M. Heyman, "The design of high-efficiency high-resolution projectors with the digital micromirror device," in SID '94 International Symposium Digest of Technical Papers (Society for Information Display, 1994), pp. 677-680.

Moss, G. H.

G. H. Moss, R. G. Fielding, M. Kavanagh, and B. R. Critchley, "A high-luminance large-screen projection system using the digital micromirror device (DMD)," in SID '96 International Symposium Digest of Technical Papers (Society for Information Display, 1996), pp. 907-910.

Penn, S. M.

D. S. Dewald, D. J. Segler, and S. M. Penn, "Advances in contrast enhancement for DLP projection displays," J. Soc. Inf. Disp. 11, 177-181 (2003).
[CrossRef]

Segler, D. J.

D. S. Dewald, D. J. Segler, and S. M. Penn, "Advances in contrast enhancement for DLP projection displays," J. Soc. Inf. Disp. 11, 177-181 (2003).
[CrossRef]

Shieh, H.-P. D.

Stupp, E. H.

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

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).

Appl. Opt. (1)

J. Soc. Inf. Disp. (1)

D. S. Dewald, D. J. Segler, and S. M. Penn, "Advances in contrast enhancement for DLP projection displays," J. Soc. Inf. Disp. 11, 177-181 (2003).
[CrossRef]

Opt. Eng. (1)

Y. Meuret and P. De Visschere, "Contrast-improving methods for Digital Micromirror Device projectors," Opt. Eng. 42, 840-845 (2003).
[CrossRef]

Proc. SPIE (3)

L. J. Hornbeck, "Digital light processing for high-brightness, high-resolution applications," in Projection Displays III, M. H. Wu, ed., Proc. SPIE 3013, 27-40 (1997).
[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).

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

Other (6)

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

G. H. Moss, R. G. Fielding, M. Kavanagh, and B. R. Critchley, "A high-luminance large-screen projection system using the digital micromirror device (DMD)," in SID '96 International Symposium Digest of Technical Papers (Society for Information Display, 1996), pp. 907-910.

H. C. Burstyn, D. Meyerhofer, and P. M. Heyman, "The design of high-efficiency high-resolution projectors with the digital micromirror device," in SID '94 International Symposium Digest of Technical Papers (Society for Information Display, 1994), pp. 677-680.

P. M. Alt, "Single crystal silicon for high resolution displays," in Proceedings of the Seventeenth International Display Research Conference, Society for Information Display, Santa Ana, Calif., 19-28 (1997).

Radiant Imaging Inc. website http://www.radimg.com.

ZEMAX Development Corp., website http://www.zemax.com.

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Figures (8)

Fig. 1
Fig. 1

(Color online) Schematic diagram of the projection system with a single DMD chip. The system is separated into three parts: illumination, relay, and projection system. The illumination system consists of a UHP lamp, a UV-IR cut filter, a color wheel with four segments, and an integrator. The relay system consists of two relay lenses, a novel TIR prism, and a DMD chip. The projection system consists of nine lenses and an off-axis tunable stop.

Fig. 2
Fig. 2

Schematic diagram of the prism set, consisting of one right angle prism (P1) and one right triangle prism (P2), for the optical separator. θ A is the apex angle of the right triangle prism. θ i n is the incident angle.

Fig. 3
Fig. 3

(Color online) Spot size and novel prism weight (black line) versus incident angle. The red, blue, and green lines indicate the spot size at the corner, edge, and center of the DMD chip position.

Fig. 4
Fig. 4

(Color online) Photo comparing (a) conventional prism set to (b) our small prism set. The footprints of the prisms are (a) 28   mm × 54   mm × 30   mm and (b) 29   mm × 22   mm × 24   mm .

Fig. 5
Fig. 5

(Color online) Arrangement of the DMD chip, the prism set, and the projection lens; (a) on-state beam is directed into the entrance pupil of the projection lens; (b) off-state beam; and (c) flat-state beam are steered away from projection lens at roughly 90°.

Fig. 6
Fig. 6

(Color online) Schematics of the pupils. The pupil of the projection lenses ( f / 2.0 ) is slightly larger than the pupil of the on-, flat-, and off-states ( f / 2.4 ) . The yellow dashed line indicates an off-axis stop. The overlap between the projection and flat-state pupil shows the flat-state light leakage into the projection lens.

Fig. 7
Fig. 7

(Color online) Images at pupil position for (a) the on-state, (b) flat-state, and (c) flat-state with off-axis stop. The light source is a UHP lamp.

Fig. 8
Fig. 8

(Color online) Contrast (black line) and geometric efficiency of the projection lens (blue line) versus the position of the off-axis stop. The position a is normalized to the diameter ( 11.6   mm ) of the stop.

Tables (2)

Tables Icon

Table 1 Size and Weight of Current TIR Prisms

Tables Icon

Table 2 Geometric Efficiency in Optical Systems with f ∕2.0 Lens

Equations (2)

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sin θ i n = n P sin ( 45 ° sin 1 sin θ D M D n P θ A ) ,
F S Y S = η s p e c × ( η g e o - i l l × η g e o - r e l × η g e o - p r o ) × F L A M P

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