Abstract

We report on observations of transient behavior of currents induced by the polarity reversal of a dc voltage applied across a nematic liquid-crystal cell. The curve of the time-evolved transient current reveals two peaks for the external voltage larger than a characteristic value. The temperature dependence of drift mobility of ion carriers implies that both the first and second peaks are caused by the director orientation in the bulk.

© 2004 Optical Society of America

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References

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  1. N. Sasaki, ???Simulation of the voltage holding ratio in liquid crystal displays with a constant charge model,??? Jpn. J. Appl. Phys. 37, 6065???6070 (1998).
    [CrossRef]
  2. T. Nakanishi, T. Takahashi, H. Mada, and S. Saito, ???Transient behavior of voltage holding ratio in nematic liquid crystal cells,??? Jpn. J. Appl. Phys. 41, 3752???3757 (2002).
    [CrossRef]
  3. G. H. Heilmeier and P. M. Heyman, ???Note on transient current measurements in liquid crystals and related systems,??? Phys. Rev. Lett. 18, 583???585 (1967).
    [CrossRef]
  4. R. N. Thurston, J. Cheng, R. B. Meyer, and G. D. Boyd, ???Physical mechanisms of dc switching in a liquidcrystal bistable boundary layer display,??? J. Appl. Phys. 56, 263???272 (1984).
    [CrossRef]
  5. A. Sugimura, Y. Takahashi, H. Sonomura, H. Naito, and M. Okuda, ???Transient current dependent on nematic director orientation,??? Mol. Cryst. Liq. Cryst. 180B, 313???328 (1990).
  6. A. Sugimura, N. Matsui, Y. Takahashi, H. Sonomura, H. Naito, and M. Okuda, ??? Transient currents in nematic liquid crystals,??? Phys. Rev. B 43, 8272???8276 (1991).
    [CrossRef]
  7. A. Mochizuki, T. Yoshihara, K. Motoyoshi, and S. Kobayashi, ???An electric bilayer model of the transient current in a nematic liquid crystal cell,??? Jpn. J. Appl. Phys. 29, L322???L325 (1990).
    [CrossRef]
  8. H. Natio, M. Okuda, and A. Sugimura, ???Transient discharging processes in nematic liquid crystals,??? Phys. Rev. A 44, R3434???R3437 (1991).
    [CrossRef]
  9. H. Naito, K. Yoshida, M. Okuda, and A. Sugimura, ???Transient charging current in nematic liquid crystals,??? J. Appl. Phys. 73, 1119???1125 (1993).
    [CrossRef]
  10. M. R. Costa, R. A. C. Altafim, and A. P. Mammana, ???Ionic impurities in nematic liquid crystal displays,??? Liq. Cryst. 28, 1779???1783 (2001).
    [CrossRef]
  11. W. Lee, C.-Y. Wang, and Y.-C. Shih, ???Effects of carbon nanosolids on the electro-optical properties of a twisted nematic liquid-crystal host,??? Appl. Phys. Lett. 85, 513???515 (2004).
    [CrossRef]

Appl. Phys. Lett. (1)

W. Lee, C.-Y. Wang, and Y.-C. Shih, ???Effects of carbon nanosolids on the electro-optical properties of a twisted nematic liquid-crystal host,??? Appl. Phys. Lett. 85, 513???515 (2004).
[CrossRef]

J. Appl. Phys. (2)

R. N. Thurston, J. Cheng, R. B. Meyer, and G. D. Boyd, ???Physical mechanisms of dc switching in a liquidcrystal bistable boundary layer display,??? J. Appl. Phys. 56, 263???272 (1984).
[CrossRef]

H. Naito, K. Yoshida, M. Okuda, and A. Sugimura, ???Transient charging current in nematic liquid crystals,??? J. Appl. Phys. 73, 1119???1125 (1993).
[CrossRef]

Jpn. J. Appl. Phys. (3)

A. Mochizuki, T. Yoshihara, K. Motoyoshi, and S. Kobayashi, ???An electric bilayer model of the transient current in a nematic liquid crystal cell,??? Jpn. J. Appl. Phys. 29, L322???L325 (1990).
[CrossRef]

N. Sasaki, ???Simulation of the voltage holding ratio in liquid crystal displays with a constant charge model,??? Jpn. J. Appl. Phys. 37, 6065???6070 (1998).
[CrossRef]

T. Nakanishi, T. Takahashi, H. Mada, and S. Saito, ???Transient behavior of voltage holding ratio in nematic liquid crystal cells,??? Jpn. J. Appl. Phys. 41, 3752???3757 (2002).
[CrossRef]

Liq. Cryst. (1)

M. R. Costa, R. A. C. Altafim, and A. P. Mammana, ???Ionic impurities in nematic liquid crystal displays,??? Liq. Cryst. 28, 1779???1783 (2001).
[CrossRef]

Mol. Cryst. Liq. Cryst. B (1)

A. Sugimura, Y. Takahashi, H. Sonomura, H. Naito, and M. Okuda, ???Transient current dependent on nematic director orientation,??? Mol. Cryst. Liq. Cryst. 180B, 313???328 (1990).

Phys. Rev. A (1)

H. Natio, M. Okuda, and A. Sugimura, ???Transient discharging processes in nematic liquid crystals,??? Phys. Rev. A 44, R3434???R3437 (1991).
[CrossRef]

Phys. Rev. B (1)

A. Sugimura, N. Matsui, Y. Takahashi, H. Sonomura, H. Naito, and M. Okuda, ??? Transient currents in nematic liquid crystals,??? Phys. Rev. B 43, 8272???8276 (1991).
[CrossRef]

Phys. Rev. Lett. (1)

G. H. Heilmeier and P. M. Heyman, ???Note on transient current measurements in liquid crystals and related systems,??? Phys. Rev. Lett. 18, 583???585 (1967).
[CrossRef]

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Figures (5)

Fig. 1.
Fig. 1.

Transient currents induced by the polarity-reversal voltage of 3 V with t 0=5 s applied to a NLC cell at various temperatures.

Fig. 2.
Fig. 2.

(a) t 1-V and (b) t 2-V (t 0=5 s) characteristics at various temperatures.

Fig. 3.
Fig. 3.

(a) I 1-V and (b) I 2-V (t0 =5 s) characteristics at various temperatures.

Fig. 4.
Fig. 4.

Temperature dependence of the drift mobility of charges (t 0=5 s).

Fig. 5.
Fig. 5.

Transient currents for various durations of the prefield of 3 V.

Tables (1)

Tables Icon

Table 1. Temperature dependence of charge mobilities.

Equations (4)

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E a ( z ) = ( σ - ε ε 0 ) exp [ z L D ( z ) ] ,
E P ( t ) = ( V d ) [ 1 2 exp ( t τ 0 ) ] ,
( 2 θ ( z , t ) z 2 ) ε 0 Δ ε 2 K 11 E ( z , t ) 2 sin 2 θ ( z , t ) γ 1 K 11 ( θ ( z , t ) t ) = 0 ,
J ( t ) = V C ( t ) t ,

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