Abstract

A trichroic prism assembly design, believed to be new, is proposed and demonstrated. This new design has the advantages of low s- and p-polarization dependence in the reflectance spectra of the optical coatings. Hence it can be used for both color separation and color recombination with polarization change. This new trichroic prism assembly is especially useful in a compact color projector employing reflective liquid-crystal light valves.

© 2000 Optical Society of America

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References

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  1. N. Okamoto, Y. Itoh, J. Ito, “High brightness technology of p-Si TFT-LCD front projector,” in Proceedings of the International Conference on Display Works (Kobe, Japan, 1998), p. 813–816.
  2. X. Liu, H. F. Li, P. F. Gu, J. F. Tang, “The application of thin film techniques in LCLV devices,” in Optical Interference Coatings, F. Abeles, ed., Proc. SPIE2253, 858–862 (1994).
    [CrossRef]
  3. H. C. Huang, P. W. Cheng, W. C. Yip, H. S. Kwok, C. S. Li, Y. Liao, “AMLCD on a silicon substrate with integrated digital data driver,” in Proceedings of the Fifteenth International Display Research Conference (Asia Display ‘95) (Hamamatsu, Japan, 1995), pp. 481–484.
  4. R. L. Melcher, M. Ohhata, K. Enami, “High-information content projection display based on reflective LC on silicon light valves,” Society for Information Display Symposium Digest (Society for Information Display, San Jose, Calif., 1998), pp. 25–28.
  5. H. C. Huang, P. W. Cheng, J. Chen, H. S. Kwok, “Color sequential miniature silicon display using reflective twisted nematic mode,” in Proceedings of the Eighteenth International Display Research Conference (Seoul, Korea, 1998), pp. 411–414.
  6. H. F. Li, Z. R. Zheng, P. F. Gu, X. Liu, P. W. Cheng, J. Chen, H. C. Huang, H. S. Kwok, “Improved projection optics for reflective silicon CMOS light valves,” in Projection Displays V, M. H. Wu, ed., Proc. SPIE3634, 123–133 (1999).
    [CrossRef]
  7. D. B. Dove, “Arrangement for projection displays employing reflective light valves,” U.S. patent5,658,060 (19August1997).
  8. F. H. Yu, J. Chen, S. T. Tang, H. S. Kwok, “A new TN-ECB mode reflective LCD with large cell gap and low operating voltage,” in Proceedings of the Seventeenth International Display Research Conference (Boston, Mass., 1997), pp. 155–158.
  9. J. A. Dobrowoski, “Optical properties of films and coatings,” in Handbook of Optics: Fundamentals, Technique, and Design, Vol. I, M. Bass, ed. (McGraw Hill, New York, 1995), pp. 42.1–42.130.
  10. M. S. Brennesholtz, “Light collection efficiency for light valve projection system,” in Projection Display II, M. H. Wu, ed., Proc. SPIE2650, 71–79 (1997).
    [CrossRef]

Brennesholtz, M. S.

M. S. Brennesholtz, “Light collection efficiency for light valve projection system,” in Projection Display II, M. H. Wu, ed., Proc. SPIE2650, 71–79 (1997).
[CrossRef]

Chen, J.

H. C. Huang, P. W. Cheng, J. Chen, H. S. Kwok, “Color sequential miniature silicon display using reflective twisted nematic mode,” in Proceedings of the Eighteenth International Display Research Conference (Seoul, Korea, 1998), pp. 411–414.

H. F. Li, Z. R. Zheng, P. F. Gu, X. Liu, P. W. Cheng, J. Chen, H. C. Huang, H. S. Kwok, “Improved projection optics for reflective silicon CMOS light valves,” in Projection Displays V, M. H. Wu, ed., Proc. SPIE3634, 123–133 (1999).
[CrossRef]

F. H. Yu, J. Chen, S. T. Tang, H. S. Kwok, “A new TN-ECB mode reflective LCD with large cell gap and low operating voltage,” in Proceedings of the Seventeenth International Display Research Conference (Boston, Mass., 1997), pp. 155–158.

Cheng, P. W.

H. C. Huang, P. W. Cheng, J. Chen, H. S. Kwok, “Color sequential miniature silicon display using reflective twisted nematic mode,” in Proceedings of the Eighteenth International Display Research Conference (Seoul, Korea, 1998), pp. 411–414.

H. F. Li, Z. R. Zheng, P. F. Gu, X. Liu, P. W. Cheng, J. Chen, H. C. Huang, H. S. Kwok, “Improved projection optics for reflective silicon CMOS light valves,” in Projection Displays V, M. H. Wu, ed., Proc. SPIE3634, 123–133 (1999).
[CrossRef]

H. C. Huang, P. W. Cheng, W. C. Yip, H. S. Kwok, C. S. Li, Y. Liao, “AMLCD on a silicon substrate with integrated digital data driver,” in Proceedings of the Fifteenth International Display Research Conference (Asia Display ‘95) (Hamamatsu, Japan, 1995), pp. 481–484.

Dobrowoski, J. A.

J. A. Dobrowoski, “Optical properties of films and coatings,” in Handbook of Optics: Fundamentals, Technique, and Design, Vol. I, M. Bass, ed. (McGraw Hill, New York, 1995), pp. 42.1–42.130.

Dove, D. B.

D. B. Dove, “Arrangement for projection displays employing reflective light valves,” U.S. patent5,658,060 (19August1997).

Enami, K.

R. L. Melcher, M. Ohhata, K. Enami, “High-information content projection display based on reflective LC on silicon light valves,” Society for Information Display Symposium Digest (Society for Information Display, San Jose, Calif., 1998), pp. 25–28.

Gu, P. F.

X. Liu, H. F. Li, P. F. Gu, J. F. Tang, “The application of thin film techniques in LCLV devices,” in Optical Interference Coatings, F. Abeles, ed., Proc. SPIE2253, 858–862 (1994).
[CrossRef]

H. F. Li, Z. R. Zheng, P. F. Gu, X. Liu, P. W. Cheng, J. Chen, H. C. Huang, H. S. Kwok, “Improved projection optics for reflective silicon CMOS light valves,” in Projection Displays V, M. H. Wu, ed., Proc. SPIE3634, 123–133 (1999).
[CrossRef]

Huang, H. C.

H. F. Li, Z. R. Zheng, P. F. Gu, X. Liu, P. W. Cheng, J. Chen, H. C. Huang, H. S. Kwok, “Improved projection optics for reflective silicon CMOS light valves,” in Projection Displays V, M. H. Wu, ed., Proc. SPIE3634, 123–133 (1999).
[CrossRef]

H. C. Huang, P. W. Cheng, W. C. Yip, H. S. Kwok, C. S. Li, Y. Liao, “AMLCD on a silicon substrate with integrated digital data driver,” in Proceedings of the Fifteenth International Display Research Conference (Asia Display ‘95) (Hamamatsu, Japan, 1995), pp. 481–484.

H. C. Huang, P. W. Cheng, J. Chen, H. S. Kwok, “Color sequential miniature silicon display using reflective twisted nematic mode,” in Proceedings of the Eighteenth International Display Research Conference (Seoul, Korea, 1998), pp. 411–414.

Ito, J.

N. Okamoto, Y. Itoh, J. Ito, “High brightness technology of p-Si TFT-LCD front projector,” in Proceedings of the International Conference on Display Works (Kobe, Japan, 1998), p. 813–816.

Itoh, Y.

N. Okamoto, Y. Itoh, J. Ito, “High brightness technology of p-Si TFT-LCD front projector,” in Proceedings of the International Conference on Display Works (Kobe, Japan, 1998), p. 813–816.

Kwok, H. S.

H. C. Huang, P. W. Cheng, W. C. Yip, H. S. Kwok, C. S. Li, Y. Liao, “AMLCD on a silicon substrate with integrated digital data driver,” in Proceedings of the Fifteenth International Display Research Conference (Asia Display ‘95) (Hamamatsu, Japan, 1995), pp. 481–484.

H. F. Li, Z. R. Zheng, P. F. Gu, X. Liu, P. W. Cheng, J. Chen, H. C. Huang, H. S. Kwok, “Improved projection optics for reflective silicon CMOS light valves,” in Projection Displays V, M. H. Wu, ed., Proc. SPIE3634, 123–133 (1999).
[CrossRef]

F. H. Yu, J. Chen, S. T. Tang, H. S. Kwok, “A new TN-ECB mode reflective LCD with large cell gap and low operating voltage,” in Proceedings of the Seventeenth International Display Research Conference (Boston, Mass., 1997), pp. 155–158.

H. C. Huang, P. W. Cheng, J. Chen, H. S. Kwok, “Color sequential miniature silicon display using reflective twisted nematic mode,” in Proceedings of the Eighteenth International Display Research Conference (Seoul, Korea, 1998), pp. 411–414.

Li, C. S.

H. C. Huang, P. W. Cheng, W. C. Yip, H. S. Kwok, C. S. Li, Y. Liao, “AMLCD on a silicon substrate with integrated digital data driver,” in Proceedings of the Fifteenth International Display Research Conference (Asia Display ‘95) (Hamamatsu, Japan, 1995), pp. 481–484.

Li, H. F.

X. Liu, H. F. Li, P. F. Gu, J. F. Tang, “The application of thin film techniques in LCLV devices,” in Optical Interference Coatings, F. Abeles, ed., Proc. SPIE2253, 858–862 (1994).
[CrossRef]

H. F. Li, Z. R. Zheng, P. F. Gu, X. Liu, P. W. Cheng, J. Chen, H. C. Huang, H. S. Kwok, “Improved projection optics for reflective silicon CMOS light valves,” in Projection Displays V, M. H. Wu, ed., Proc. SPIE3634, 123–133 (1999).
[CrossRef]

Liao, Y.

H. C. Huang, P. W. Cheng, W. C. Yip, H. S. Kwok, C. S. Li, Y. Liao, “AMLCD on a silicon substrate with integrated digital data driver,” in Proceedings of the Fifteenth International Display Research Conference (Asia Display ‘95) (Hamamatsu, Japan, 1995), pp. 481–484.

Liu, X.

X. Liu, H. F. Li, P. F. Gu, J. F. Tang, “The application of thin film techniques in LCLV devices,” in Optical Interference Coatings, F. Abeles, ed., Proc. SPIE2253, 858–862 (1994).
[CrossRef]

H. F. Li, Z. R. Zheng, P. F. Gu, X. Liu, P. W. Cheng, J. Chen, H. C. Huang, H. S. Kwok, “Improved projection optics for reflective silicon CMOS light valves,” in Projection Displays V, M. H. Wu, ed., Proc. SPIE3634, 123–133 (1999).
[CrossRef]

Melcher, R. L.

R. L. Melcher, M. Ohhata, K. Enami, “High-information content projection display based on reflective LC on silicon light valves,” Society for Information Display Symposium Digest (Society for Information Display, San Jose, Calif., 1998), pp. 25–28.

Ohhata, M.

R. L. Melcher, M. Ohhata, K. Enami, “High-information content projection display based on reflective LC on silicon light valves,” Society for Information Display Symposium Digest (Society for Information Display, San Jose, Calif., 1998), pp. 25–28.

Okamoto, N.

N. Okamoto, Y. Itoh, J. Ito, “High brightness technology of p-Si TFT-LCD front projector,” in Proceedings of the International Conference on Display Works (Kobe, Japan, 1998), p. 813–816.

Tang, J. F.

X. Liu, H. F. Li, P. F. Gu, J. F. Tang, “The application of thin film techniques in LCLV devices,” in Optical Interference Coatings, F. Abeles, ed., Proc. SPIE2253, 858–862 (1994).
[CrossRef]

Tang, S. T.

F. H. Yu, J. Chen, S. T. Tang, H. S. Kwok, “A new TN-ECB mode reflective LCD with large cell gap and low operating voltage,” in Proceedings of the Seventeenth International Display Research Conference (Boston, Mass., 1997), pp. 155–158.

Yip, W. C.

H. C. Huang, P. W. Cheng, W. C. Yip, H. S. Kwok, C. S. Li, Y. Liao, “AMLCD on a silicon substrate with integrated digital data driver,” in Proceedings of the Fifteenth International Display Research Conference (Asia Display ‘95) (Hamamatsu, Japan, 1995), pp. 481–484.

Yu, F. H.

F. H. Yu, J. Chen, S. T. Tang, H. S. Kwok, “A new TN-ECB mode reflective LCD with large cell gap and low operating voltage,” in Proceedings of the Seventeenth International Display Research Conference (Boston, Mass., 1997), pp. 155–158.

Zheng, Z. R.

H. F. Li, Z. R. Zheng, P. F. Gu, X. Liu, P. W. Cheng, J. Chen, H. C. Huang, H. S. Kwok, “Improved projection optics for reflective silicon CMOS light valves,” in Projection Displays V, M. H. Wu, ed., Proc. SPIE3634, 123–133 (1999).
[CrossRef]

Other

N. Okamoto, Y. Itoh, J. Ito, “High brightness technology of p-Si TFT-LCD front projector,” in Proceedings of the International Conference on Display Works (Kobe, Japan, 1998), p. 813–816.

X. Liu, H. F. Li, P. F. Gu, J. F. Tang, “The application of thin film techniques in LCLV devices,” in Optical Interference Coatings, F. Abeles, ed., Proc. SPIE2253, 858–862 (1994).
[CrossRef]

H. C. Huang, P. W. Cheng, W. C. Yip, H. S. Kwok, C. S. Li, Y. Liao, “AMLCD on a silicon substrate with integrated digital data driver,” in Proceedings of the Fifteenth International Display Research Conference (Asia Display ‘95) (Hamamatsu, Japan, 1995), pp. 481–484.

R. L. Melcher, M. Ohhata, K. Enami, “High-information content projection display based on reflective LC on silicon light valves,” Society for Information Display Symposium Digest (Society for Information Display, San Jose, Calif., 1998), pp. 25–28.

H. C. Huang, P. W. Cheng, J. Chen, H. S. Kwok, “Color sequential miniature silicon display using reflective twisted nematic mode,” in Proceedings of the Eighteenth International Display Research Conference (Seoul, Korea, 1998), pp. 411–414.

H. F. Li, Z. R. Zheng, P. F. Gu, X. Liu, P. W. Cheng, J. Chen, H. C. Huang, H. S. Kwok, “Improved projection optics for reflective silicon CMOS light valves,” in Projection Displays V, M. H. Wu, ed., Proc. SPIE3634, 123–133 (1999).
[CrossRef]

D. B. Dove, “Arrangement for projection displays employing reflective light valves,” U.S. patent5,658,060 (19August1997).

F. H. Yu, J. Chen, S. T. Tang, H. S. Kwok, “A new TN-ECB mode reflective LCD with large cell gap and low operating voltage,” in Proceedings of the Seventeenth International Display Research Conference (Boston, Mass., 1997), pp. 155–158.

J. A. Dobrowoski, “Optical properties of films and coatings,” in Handbook of Optics: Fundamentals, Technique, and Design, Vol. I, M. Bass, ed. (McGraw Hill, New York, 1995), pp. 42.1–42.130.

M. S. Brennesholtz, “Light collection efficiency for light valve projection system,” in Projection Display II, M. H. Wu, ed., Proc. SPIE2650, 71–79 (1997).
[CrossRef]

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Figures (6)

Fig. 1
Fig. 1

Optical system for a reflective color projector with conventional configuration. R-LCD, G-LCD, and B-LCD stand for red, green, and blue LCD light valves.

Fig. 2
Fig. 2

Optical system for a reflective color projection display employing a TPA.

Fig. 3
Fig. 3

Calculated reflectance spectra for the red and the blue edge reflection coatings for incidence angles of (a) 16°, (b) 30°, and (c) 45°. Solid curves, p-polarized light; dashed curves, s-polarized light.

Fig. 4
Fig. 4

New TPA together with the new noncubic PBS.

Fig. 5
Fig. 5

Measured reflectance spectra for the conventional 30° TPA.

Fig. 6
Fig. 6

Measured reflectance spectra for the new 16° TPA.

Equations (7)

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

ηis=ni cos θ  for s polarization,
ηip=nicos θ  for p polarization.
θ=ϕ,
ϕ12sin-11n+sin-1 NA,
ϕ22sin-11n+sin-1 NA,
ϕ3=90°-θ.
θ>13sin-11n+sin-1 NA.

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