Abstract

Pretilt angle effect on liquid crystal dynamics is analyzed theoretically. Analytical expressions are derived to describe liquid crystal response time under nonzero pretilt angle conditions. The theoretical analysis is confirmed experimentally using vertically aligned liquid crystal cells. This finding quantitatively correlates pretilt angles with liquid crystal response time. This study improves the understanding of the liquid crystal dynamic process which is helpful for optimizing liquid crystal response time.

© 2007 IEEE

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  1. T. J. Scheffer, J. Nehring, "Accurate determination of liquid-crystal tilt bias angles," J Appl Phys. 48, 1783-1792 (1977).
  2. H. Wang, T. X. Wu, X. Zhu, S. T. Wu, "Correlations between liquid crystal director reorientation and optical response time of a homeotropic cell," J. Appl. Phys. 95, 5502-5508 (2004).
  3. X. Zhu, Z. Ge, T. X. Wu, S. T. Wu, "Transflective liquid crystal displays," J. Display Technol. 1, 15-29 (2005).
  4. D. K. Yang, S. T. Wu, Fundamentals of Liquid Crystal Devices (Wiley, 2006).
  5. M. F. Schiekel, K. Fahrenschon, "Deformation of nematic liquid crystals with vertical orientation in electric fields," Appl. Phys. Lett. 19, 391-393 (1971).
  6. D. Armitage, I. Underwood, S. T. Wu, Introduction to Microdisplays (Wiley, 2006).
  7. K. H. Fan-Chiang, S. T. Wu, S. H. Chen, "Fringing field effects on high-resolution liquid crystal microdisplays," J. Display Technol. 1, 304-313 (2005).
  8. J. L. Erickson, "Conservation laws for liquid crystals," Trans. Soc. Rheol. 5, 23-34 (1961).
  9. F. M. Leslie, "Some constitutive equations for liquid crystals," Arch. Ration. Mech. Anal. 28, 265-283 (1968).
  10. E. Jakeman, E. P. Raynes, "Electro-optic response times in liquid crystals," Phys. Lett. 39A, 69-70 (1972).
  11. S. T. Wu, C. S. Wu, "High-speed liquid-crystal modulators using transient nematic effect," J. Appl. Phys. 65, 527-532 (1989).
  12. X. Nie, Y. H. Lin, T. X. Wu, H. Wang, Z. Ge, S. T. Wu, "Polar anchoring energy measurement of vertically aligned liquid-crystal cells," J. Appl. Phys. 98, 013516 (2005).
  13. J. M. Geary, J. W. Goodby, A. R. Kmetz, J. S. Patel, "The mechanism of polymer alignment of liquid-crystal materials," J. Appl. Phys. 62, 4100-4108 (1987).
  14. D. S. Seo, S. Kobayashi, M. Nishikawa, "Study of the pretilt angle for 5CB on rubbed polyimide films containing trifluoromethyl moiety and analysis of the surface atomic concentration of F/C(%) with an electron spectroscope for chemical analysis," Appl. Phys. Lett. 61, 2392-2394 (1991).
  15. S. T. Wu, C. S. Wu, "Experimental confirmation of the Osipov-Terentjev theory on the viscosity of nematic liquid crystals," Phys. Rev. A 42, 2219-2227 (1990).

2005 (3)

2004 (1)

H. Wang, T. X. Wu, X. Zhu, S. T. Wu, "Correlations between liquid crystal director reorientation and optical response time of a homeotropic cell," J. Appl. Phys. 95, 5502-5508 (2004).

1991 (1)

D. S. Seo, S. Kobayashi, M. Nishikawa, "Study of the pretilt angle for 5CB on rubbed polyimide films containing trifluoromethyl moiety and analysis of the surface atomic concentration of F/C(%) with an electron spectroscope for chemical analysis," Appl. Phys. Lett. 61, 2392-2394 (1991).

1990 (1)

S. T. Wu, C. S. Wu, "Experimental confirmation of the Osipov-Terentjev theory on the viscosity of nematic liquid crystals," Phys. Rev. A 42, 2219-2227 (1990).

1989 (1)

S. T. Wu, C. S. Wu, "High-speed liquid-crystal modulators using transient nematic effect," J. Appl. Phys. 65, 527-532 (1989).

1987 (1)

J. M. Geary, J. W. Goodby, A. R. Kmetz, J. S. Patel, "The mechanism of polymer alignment of liquid-crystal materials," J. Appl. Phys. 62, 4100-4108 (1987).

1977 (1)

T. J. Scheffer, J. Nehring, "Accurate determination of liquid-crystal tilt bias angles," J Appl Phys. 48, 1783-1792 (1977).

1972 (1)

E. Jakeman, E. P. Raynes, "Electro-optic response times in liquid crystals," Phys. Lett. 39A, 69-70 (1972).

1971 (1)

M. F. Schiekel, K. Fahrenschon, "Deformation of nematic liquid crystals with vertical orientation in electric fields," Appl. Phys. Lett. 19, 391-393 (1971).

1968 (1)

F. M. Leslie, "Some constitutive equations for liquid crystals," Arch. Ration. Mech. Anal. 28, 265-283 (1968).

1961 (1)

J. L. Erickson, "Conservation laws for liquid crystals," Trans. Soc. Rheol. 5, 23-34 (1961).

Appl. Phys. Lett. (1)

M. F. Schiekel, K. Fahrenschon, "Deformation of nematic liquid crystals with vertical orientation in electric fields," Appl. Phys. Lett. 19, 391-393 (1971).

Appl. Phys. Lett. (1)

D. S. Seo, S. Kobayashi, M. Nishikawa, "Study of the pretilt angle for 5CB on rubbed polyimide films containing trifluoromethyl moiety and analysis of the surface atomic concentration of F/C(%) with an electron spectroscope for chemical analysis," Appl. Phys. Lett. 61, 2392-2394 (1991).

Arch. Ration. Mech. Anal. (1)

F. M. Leslie, "Some constitutive equations for liquid crystals," Arch. Ration. Mech. Anal. 28, 265-283 (1968).

J Appl Phys. (1)

T. J. Scheffer, J. Nehring, "Accurate determination of liquid-crystal tilt bias angles," J Appl Phys. 48, 1783-1792 (1977).

J. Appl. Phys. (4)

H. Wang, T. X. Wu, X. Zhu, S. T. Wu, "Correlations between liquid crystal director reorientation and optical response time of a homeotropic cell," J. Appl. Phys. 95, 5502-5508 (2004).

S. T. Wu, C. S. Wu, "High-speed liquid-crystal modulators using transient nematic effect," J. Appl. Phys. 65, 527-532 (1989).

X. Nie, Y. H. Lin, T. X. Wu, H. Wang, Z. Ge, S. T. Wu, "Polar anchoring energy measurement of vertically aligned liquid-crystal cells," J. Appl. Phys. 98, 013516 (2005).

J. M. Geary, J. W. Goodby, A. R. Kmetz, J. S. Patel, "The mechanism of polymer alignment of liquid-crystal materials," J. Appl. Phys. 62, 4100-4108 (1987).

J. Display Technol. (2)

Phys. Rev. A (1)

S. T. Wu, C. S. Wu, "Experimental confirmation of the Osipov-Terentjev theory on the viscosity of nematic liquid crystals," Phys. Rev. A 42, 2219-2227 (1990).

Phys. Lett. (1)

E. Jakeman, E. P. Raynes, "Electro-optic response times in liquid crystals," Phys. Lett. 39A, 69-70 (1972).

Trans. Soc. Rheol. (1)

J. L. Erickson, "Conservation laws for liquid crystals," Trans. Soc. Rheol. 5, 23-34 (1961).

Other (2)

D. Armitage, I. Underwood, S. T. Wu, Introduction to Microdisplays (Wiley, 2006).

D. K. Yang, S. T. Wu, Fundamentals of Liquid Crystal Devices (Wiley, 2006).

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