Abstract

A new method using a monochromatic light-emitting diode (LED) to measure the optical density (OD) of the black matrix of thin-film transistor liquid crystal display (LCD) is developed in this study. The measured results show that the average OD difference is within 1% between the proposed 3 W monochromatic LED and the currently adopted 100 W quartz halogen lamp. On the other hand, the monochromatic LED reduces the boosting time by 40% in establishing the baseline database. The 3σ standard deviation of the OD of the test samples is from 0.1% to 0.6% for the LED, whereas it is from 0.5% to 1.2% for the halogen lamp. Using standard glass samples, the monochromatic LED demonstrates accuracy within 1.58%, better than that of the quartz halogen lamp. Therefore, it can substitute for the quartz halogen lamp currently used in the thin-film transistor LCD industry for OD measurement of the black matrix layer, as it is faster, is more accurate, is more reliable, and consumes less power.

© 2009 Optical Society of America

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References

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  1. T. C. Yen and P. L. Tso, “Fine line-width black matrix of a color filter by an advanced polishing method,” J. Micromech. Microeng. 14, 867-875 (2004).
    [CrossRef]
  2. P. Kundu and A. Kar, “Photovoltaic measurement of optical density on a linear scale,” J. Phys. E 9, 974-976 (1976).
    [CrossRef]
  3. Z. M. Zhang, T. R. Gentile, A. L. Migdall, and R. U. Datla, “Transmittance measurements for filter of optical density between one and ten,” Appl. Opt. 36, 8889-8895 (1997).
    [CrossRef]
  4. A. Marie, A. Afzali-Ardakani, C. Feger, and C. Narayan, “Flat panel display containing black matrix polymer,” U.S. patent 5,619,357 (8 April 1997).
  5. R. W. Sabnis, T. L. Brewer, R. E. Nichols, E. G. Hays, M. D. Stroder, A. Yanagimoto, Y. Sone, Y. Watanabe, and E. Kiyomi, “High optical density ultra thin organic black matrix system,” U.S. patent 5,998,090 (7 December 1999).
  6. M. A. Silva, A. F. Frese, and A. T. Araki, “Predicting the effect of film processing on optical density formation by computer simulation,” in Proceedings of the 25th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2003 (IEEE, 2003), Vol. 1, pp. 1002-1005.
    [PubMed]
  7. Hamamatsu, “PMT modules (analog),” http://jp.hamamatsu.com/products/sensor-etd/pd002/pd395/index_en.html.

2004 (1)

T. C. Yen and P. L. Tso, “Fine line-width black matrix of a color filter by an advanced polishing method,” J. Micromech. Microeng. 14, 867-875 (2004).
[CrossRef]

1997 (1)

1976 (1)

P. Kundu and A. Kar, “Photovoltaic measurement of optical density on a linear scale,” J. Phys. E 9, 974-976 (1976).
[CrossRef]

Afzali-Ardakani, A.

A. Marie, A. Afzali-Ardakani, C. Feger, and C. Narayan, “Flat panel display containing black matrix polymer,” U.S. patent 5,619,357 (8 April 1997).

Araki, A. T.

M. A. Silva, A. F. Frese, and A. T. Araki, “Predicting the effect of film processing on optical density formation by computer simulation,” in Proceedings of the 25th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2003 (IEEE, 2003), Vol. 1, pp. 1002-1005.
[PubMed]

Brewer, T. L.

R. W. Sabnis, T. L. Brewer, R. E. Nichols, E. G. Hays, M. D. Stroder, A. Yanagimoto, Y. Sone, Y. Watanabe, and E. Kiyomi, “High optical density ultra thin organic black matrix system,” U.S. patent 5,998,090 (7 December 1999).

Datla, R. U.

Feger, C.

A. Marie, A. Afzali-Ardakani, C. Feger, and C. Narayan, “Flat panel display containing black matrix polymer,” U.S. patent 5,619,357 (8 April 1997).

Frese, A. F.

M. A. Silva, A. F. Frese, and A. T. Araki, “Predicting the effect of film processing on optical density formation by computer simulation,” in Proceedings of the 25th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2003 (IEEE, 2003), Vol. 1, pp. 1002-1005.
[PubMed]

Gentile, T. R.

Hays, E. G.

R. W. Sabnis, T. L. Brewer, R. E. Nichols, E. G. Hays, M. D. Stroder, A. Yanagimoto, Y. Sone, Y. Watanabe, and E. Kiyomi, “High optical density ultra thin organic black matrix system,” U.S. patent 5,998,090 (7 December 1999).

Kar, A.

P. Kundu and A. Kar, “Photovoltaic measurement of optical density on a linear scale,” J. Phys. E 9, 974-976 (1976).
[CrossRef]

Kiyomi, E.

R. W. Sabnis, T. L. Brewer, R. E. Nichols, E. G. Hays, M. D. Stroder, A. Yanagimoto, Y. Sone, Y. Watanabe, and E. Kiyomi, “High optical density ultra thin organic black matrix system,” U.S. patent 5,998,090 (7 December 1999).

Kundu, P.

P. Kundu and A. Kar, “Photovoltaic measurement of optical density on a linear scale,” J. Phys. E 9, 974-976 (1976).
[CrossRef]

Marie, A.

A. Marie, A. Afzali-Ardakani, C. Feger, and C. Narayan, “Flat panel display containing black matrix polymer,” U.S. patent 5,619,357 (8 April 1997).

Migdall, A. L.

Narayan, C.

A. Marie, A. Afzali-Ardakani, C. Feger, and C. Narayan, “Flat panel display containing black matrix polymer,” U.S. patent 5,619,357 (8 April 1997).

Nichols, R. E.

R. W. Sabnis, T. L. Brewer, R. E. Nichols, E. G. Hays, M. D. Stroder, A. Yanagimoto, Y. Sone, Y. Watanabe, and E. Kiyomi, “High optical density ultra thin organic black matrix system,” U.S. patent 5,998,090 (7 December 1999).

Sabnis, R. W.

R. W. Sabnis, T. L. Brewer, R. E. Nichols, E. G. Hays, M. D. Stroder, A. Yanagimoto, Y. Sone, Y. Watanabe, and E. Kiyomi, “High optical density ultra thin organic black matrix system,” U.S. patent 5,998,090 (7 December 1999).

Silva, M. A.

M. A. Silva, A. F. Frese, and A. T. Araki, “Predicting the effect of film processing on optical density formation by computer simulation,” in Proceedings of the 25th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2003 (IEEE, 2003), Vol. 1, pp. 1002-1005.
[PubMed]

Sone, Y.

R. W. Sabnis, T. L. Brewer, R. E. Nichols, E. G. Hays, M. D. Stroder, A. Yanagimoto, Y. Sone, Y. Watanabe, and E. Kiyomi, “High optical density ultra thin organic black matrix system,” U.S. patent 5,998,090 (7 December 1999).

Stroder, M. D.

R. W. Sabnis, T. L. Brewer, R. E. Nichols, E. G. Hays, M. D. Stroder, A. Yanagimoto, Y. Sone, Y. Watanabe, and E. Kiyomi, “High optical density ultra thin organic black matrix system,” U.S. patent 5,998,090 (7 December 1999).

Tso, P. L.

T. C. Yen and P. L. Tso, “Fine line-width black matrix of a color filter by an advanced polishing method,” J. Micromech. Microeng. 14, 867-875 (2004).
[CrossRef]

Watanabe, Y.

R. W. Sabnis, T. L. Brewer, R. E. Nichols, E. G. Hays, M. D. Stroder, A. Yanagimoto, Y. Sone, Y. Watanabe, and E. Kiyomi, “High optical density ultra thin organic black matrix system,” U.S. patent 5,998,090 (7 December 1999).

Yanagimoto, A.

R. W. Sabnis, T. L. Brewer, R. E. Nichols, E. G. Hays, M. D. Stroder, A. Yanagimoto, Y. Sone, Y. Watanabe, and E. Kiyomi, “High optical density ultra thin organic black matrix system,” U.S. patent 5,998,090 (7 December 1999).

Yen, T. C.

T. C. Yen and P. L. Tso, “Fine line-width black matrix of a color filter by an advanced polishing method,” J. Micromech. Microeng. 14, 867-875 (2004).
[CrossRef]

Zhang, Z. M.

Appl. Opt. (1)

J. Micromech. Microeng. (1)

T. C. Yen and P. L. Tso, “Fine line-width black matrix of a color filter by an advanced polishing method,” J. Micromech. Microeng. 14, 867-875 (2004).
[CrossRef]

J. Phys. E (1)

P. Kundu and A. Kar, “Photovoltaic measurement of optical density on a linear scale,” J. Phys. E 9, 974-976 (1976).
[CrossRef]

Other (4)

A. Marie, A. Afzali-Ardakani, C. Feger, and C. Narayan, “Flat panel display containing black matrix polymer,” U.S. patent 5,619,357 (8 April 1997).

R. W. Sabnis, T. L. Brewer, R. E. Nichols, E. G. Hays, M. D. Stroder, A. Yanagimoto, Y. Sone, Y. Watanabe, and E. Kiyomi, “High optical density ultra thin organic black matrix system,” U.S. patent 5,998,090 (7 December 1999).

M. A. Silva, A. F. Frese, and A. T. Araki, “Predicting the effect of film processing on optical density formation by computer simulation,” in Proceedings of the 25th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2003 (IEEE, 2003), Vol. 1, pp. 1002-1005.
[PubMed]

Hamamatsu, “PMT modules (analog),” http://jp.hamamatsu.com/products/sensor-etd/pd002/pd395/index_en.html.

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Figures (6)

Fig. 1
Fig. 1

Schematic diagram of the samples on the plane stage.

Fig. 2
Fig. 2

Systematic framework of quartz halogen lamp system.

Fig. 3
Fig. 3

Spectra of ND filters from monochrome LED.

Fig. 4
Fig. 4

Spectra of ND filters from quartz halogen lamp.

Fig. 5
Fig. 5

Baseline voltage database for monochromatic LED.

Fig. 6
Fig. 6

Baseline voltage database for quartz halogen lamp.

Tables (4)

Tables Icon

Table 1 Boosting Time for Both Light Sources

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Table 2 Comparison between Both Light Sources for Standard Glass

Tables Icon

Table 3 OD Results for the Monochromatic LED

Tables Icon

Table 4 OD Results for the Quartz Halogen Lamp

Equations (4)

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OD n 1 = OD n 1 , cal log 10 ( V measure D s V n 1 , cal D s ) PMT ,
OD n = OD n , cal log 10 ( V measure D s V n , cal D s ) PMT ,
R n 1 = V n 1 , control ( v ) V n 1 , control ( v ) + V n , control ( v ) , R n 1 = 1 R n ,
OD measure = R n 1 OD n 1 + R n OD n .

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