Transient leakage current in nematic LCDs

Maximus, Bart; Colpaert, Chris; Meyere, Arnout De; Pauwels, Herman; Plach, H. J.

doi:10.1080/02678299308036506

Cited by 11 publications

(4 citation statements)

References 6 publications

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“…The behavior of ions in nematic liquid crystals has been studied extensively in literature [1][2][3][4]. The presence of ions has been detected by current measurements under sine wave, square wave or triangular voltages.…”

Section: Introductionmentioning

confidence: 99%

Ion Transport and Switching Currents in Smectic Liquid Crystal Devices

Neyts

Beunis

2006

GFER

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In SSFLC and AFLC devices, the voltage over the liquid crystal is not only determined by the applied voltage, but also by the separation of ions and the spontaneous polarization. The motion of ions and the switching of the spontaneous polarization are therefore interfering phenomena. A simplified model for ion transport and switching of polarization is introduced which is able to explain the shift in apparent threshold voltage and the variation of the hysteresis width.

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Section: Introductionmentioning

confidence: 99%

Ion Transport and Switching Currents in Smectic Liquid Crystal Devices

Neyts

Beunis

2006

GFER

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“…The Langmuir model parameters used for the calculation are K R p = 0.1, K R m = 1, K L p = 0.1, and K L m = 10, where K i a = k i a τ i a (see appendix-A). Typical values of the adsorption parameters for liquid crystals are given in [32][33][34][35]. Figure 2, shows in reduced units (a) u(z), (b) p(z) (solid line), m(z) (dashed line), and (c) −u ′ (z) for asymmetric electrodes that are dominated by adsorption of ions that have an effective charge of opposite sign at the electrodes.…”

Section: Numerical Analysismentioning

confidence: 99%

Asymmetric adsorption in an open electrolytic cell

Bousiadi

Lelidis

2018

Physics Letters A

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We investigate the effect of adsorption-desorption phenomenon of ions in an asymmetric electrolytic cell at open circuit conditions. Our approach is based on the Poisson-Nernst-Planck theory for electrolytes and the kinetic model of Langmuir for the description of adsorption-desorption phenomena on the electrodes. When the electrodes are immersed into the solution, selective ion adsorption takes place. It is shown, that the selective ion adsorption is responsible for generating an electrical potential difference between the electrodes of the cell. The analytical expressions for the potential difference and for the charge distribution are calculated. Finally, the time evolution of the system is investigated and the relaxation times of the problem are deduced numerically.Comment: 9 pages, 5 figure

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“…The transient ion current [2][3] for every column has been integrated to yield the ionic charge (eSd LC n 0 ). The comparison of the ion content in the columns before and after the stress is given in Figure 5.…”

Section: Stressing Measurement and Observationsmentioning

confidence: 99%

“…The threshold voltage was around 1.5 V. The ion concentration in the cell was 9.7e19 m À3 and the mobilities of two ion kinds are 2.2e-10 and 0.6e-10 m 2 =V.s. The ion parameters were obtained by using the transient-current technique [2]. The polarizers are aligned for a normally white mode.…”

Section: Stressing Measurement and Observationsmentioning

confidence: 99%

Measurements of Lateral Ion Transport in LCD Cells

Stojmenovik

Neyts

Vermael

et al. 2004

Molecular Crystals and Liquid Crystals

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The ions present in liquid crystal devices modulate the applied electric field and lead to deterioration of the expected good optical response. In addition to the flicker and ghost images, a boundary image-retention effect is also possible. It occurs near the edges of a stressed pixel. We have attributed this effect to ions moving in the plane perpendicular to the applied electric field. This hypothesis has been proven using a combination of electrical and optical measurements. The observed optical non-homogeneity and its evolution with stress time were explained using the new model of lateral ion transport. The physical cause of this phenomenon is subject to further study.

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Transient leakage current in nematic LCDs

Cited by 11 publications

References 6 publications

Ion Transport and Switching Currents in Smectic Liquid Crystal Devices

Ion Transport and Switching Currents in Smectic Liquid Crystal Devices

Asymmetric adsorption in an open electrolytic cell

Measurements of Lateral Ion Transport in LCD Cells

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