Abstract

We propose a novel measurement method for determining cell parameters, such as a cell thickness and twist angle in reflective liquid crystal (LC) cells, by using a unique polarization-converting device prepared with a circularly and homogeneously aligned LC (CH-LC) cell. The light intensity distributions from the reflective LC cell transmitted twice through the CH-LC cell are measured by a charge-coupled device array camera. Cell thickness can be derived by using coordinate values of local minimum spot in the spatial light intensity distribution measured at one wavelength, where the pretilt angle is assumed to be the designed value. Both cell thickness and twist angle can also be determined by two local minimum positions of the light intensity at two different wavelengths and the effects of a quarter-wave plate are discussed.

© 2007 IEEE

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  1. Y. Zhou, Z. He, S. Sato, "A novel method for determining the cell thickness and twist angle of a twisted nematic cell by stokes parameter measurement," Jpn. J. Appl. Phys. 36, 2760-2764 (1997).
  2. Z. He, Y. Zhou, S. Sato, "A two-dimensional stokes parameter method for determination of cell thickness and twist angle distributions in twisted nematic liquid crystal devices," Jpn. J. Appl. Phys. 37, 1982-1988 (1998).
  3. S. T. Wu, G. Xu, "Cell gap and twist angle determinations of a reflective liquid crystal display," IEEE Trans. Electron Devices 47, 2290-2293 (2000).
  4. F. Bruneel, H. D. Smet, J. Vanfletern, A. V. Calster, "Method for measuring the cell gap in liquid-crystal displays," Opt. Eng. 40, 259-267 (2001).
  5. T. Satake, T. Nishioka, T. Kurata, T. Maehara, "Novel gap measurement method of reflective LCD," Proc. ASID (2001) pp. 185-188.
  6. M. Kawamura, S. Sato, "Measurements of cell thickness distributions in reflective liquid crystal cells using a two-dimensional stokes parameter method," Jpn. J. Appl. Phys. 40, L621-L624 (2001).
  7. T. Nishioka, T. Kurata, "Novel pretilt angle measurement method for twisted-nematic liquid-crystal cells by apparent retardation measurement," Jpn. J. Appl. Phys 40, 6017-6023 (2001).
  8. W. K. Choi, "Reflective liquid-crystal cell-gap measurement using input-polarization-angle dependence," SID Dig. (2002) pp. 530-534.
  9. S. H. Lee, W. S. Park, G. D. Lee, K. Y. Han, "Low-cell-gap measurement by rotation of a wave retarder," Jpn. J. Appl. Phys. 41, 379-383 (2002).
  10. M. Kawamura, Y. Goto, S. Sato, "A two-dimensional pretilt angle distribution measurement of twisted nematic liquid crystal cells using stokes parameters at plural wavelengths," Jpn. J. Appl. Phys. 43, 709-714 (2004).
  11. M. Kawamura, Y. Goto, S. Sato, "Two-dimensional measurements of cell parameter distributions in reflective liquid crystal displays by using multiple wavelengths Stokes parameters," J. Appl. Phys. 95, 4371-4375 (2004).
  12. S. Masuda, T. Nose, S. Sato, "Optical properties of a polarization converting device using a nematic liquid crystal cell," Opt. Rev. 2, 211-216 (1995).
  13. M. Honma, R. Yamaguchi, S. Sato, "Application of a circularly-homogeneously aligned liquid crystal cell to real time measurements of twist angles in twisted nematic liquid crystal cells," Jpn. J. Appl. Phys. 39, 2727-2731 (2000).
  14. A. Lien, "The general and simplified Jones matrix representations for the high pretilt twisted nematic cell," Jpn. J. Appl. Phys. 67, 2853-2856 (1990).
  15. H. L. Ong, "Electro-optics of electrically controlled birefringence liquid crystal display by 2 x 2 propagation matrix and analytic expression at oblique incident angle," Appl. Phys. Lett. 59, 155-157 (1991).
  16. A. Lien, C. J. Chen, "A new 2 x 2 matrix representation for twisted nematic liquid crystal displays at oblique incidence," Jpn. J. Appl. Phys. 35, L1200-L1203 (1996).
  17. C.-J. Chen, A. Lien, M. I. Nathan, "4 x 4 matrix method for biaxial media and its application to liquid crystal displays," Jpn. J. Appl. Phys. 35, L1204-L1207 (1996).

Appl. Phys. Lett.

H. L. Ong, "Electro-optics of electrically controlled birefringence liquid crystal display by 2 x 2 propagation matrix and analytic expression at oblique incident angle," Appl. Phys. Lett. 59, 155-157 (1991).

IEEE Trans. Electron Devices

S. T. Wu, G. Xu, "Cell gap and twist angle determinations of a reflective liquid crystal display," IEEE Trans. Electron Devices 47, 2290-2293 (2000).

J. Appl. Phys.

M. Kawamura, Y. Goto, S. Sato, "Two-dimensional measurements of cell parameter distributions in reflective liquid crystal displays by using multiple wavelengths Stokes parameters," J. Appl. Phys. 95, 4371-4375 (2004).

Jpn. J. Appl. Phys.

A. Lien, "The general and simplified Jones matrix representations for the high pretilt twisted nematic cell," Jpn. J. Appl. Phys. 67, 2853-2856 (1990).

Y. Zhou, Z. He, S. Sato, "A novel method for determining the cell thickness and twist angle of a twisted nematic cell by stokes parameter measurement," Jpn. J. Appl. Phys. 36, 2760-2764 (1997).

Jpn. J. Appl. Phys

T. Nishioka, T. Kurata, "Novel pretilt angle measurement method for twisted-nematic liquid-crystal cells by apparent retardation measurement," Jpn. J. Appl. Phys 40, 6017-6023 (2001).

Jpn. J. Appl. Phys.

S. H. Lee, W. S. Park, G. D. Lee, K. Y. Han, "Low-cell-gap measurement by rotation of a wave retarder," Jpn. J. Appl. Phys. 41, 379-383 (2002).

M. Kawamura, Y. Goto, S. Sato, "A two-dimensional pretilt angle distribution measurement of twisted nematic liquid crystal cells using stokes parameters at plural wavelengths," Jpn. J. Appl. Phys. 43, 709-714 (2004).

Z. He, Y. Zhou, S. Sato, "A two-dimensional stokes parameter method for determination of cell thickness and twist angle distributions in twisted nematic liquid crystal devices," Jpn. J. Appl. Phys. 37, 1982-1988 (1998).

A. Lien, C. J. Chen, "A new 2 x 2 matrix representation for twisted nematic liquid crystal displays at oblique incidence," Jpn. J. Appl. Phys. 35, L1200-L1203 (1996).

C.-J. Chen, A. Lien, M. I. Nathan, "4 x 4 matrix method for biaxial media and its application to liquid crystal displays," Jpn. J. Appl. Phys. 35, L1204-L1207 (1996).

M. Kawamura, S. Sato, "Measurements of cell thickness distributions in reflective liquid crystal cells using a two-dimensional stokes parameter method," Jpn. J. Appl. Phys. 40, L621-L624 (2001).

M. Honma, R. Yamaguchi, S. Sato, "Application of a circularly-homogeneously aligned liquid crystal cell to real time measurements of twist angles in twisted nematic liquid crystal cells," Jpn. J. Appl. Phys. 39, 2727-2731 (2000).

Opt. Eng.

F. Bruneel, H. D. Smet, J. Vanfletern, A. V. Calster, "Method for measuring the cell gap in liquid-crystal displays," Opt. Eng. 40, 259-267 (2001).

Opt. Rev.

S. Masuda, T. Nose, S. Sato, "Optical properties of a polarization converting device using a nematic liquid crystal cell," Opt. Rev. 2, 211-216 (1995).

Other

T. Satake, T. Nishioka, T. Kurata, T. Maehara, "Novel gap measurement method of reflective LCD," Proc. ASID (2001) pp. 185-188.

W. K. Choi, "Reflective liquid-crystal cell-gap measurement using input-polarization-angle dependence," SID Dig. (2002) pp. 530-534.

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