Adequate measuring techniques for ions in liquid crystal layers

Colpaert, Chris; Maximus, Bart; Meyere, Arnout De

doi:10.1080/02678299608033803

Cited by 58 publications

(39 citation statements)

References 9 publications

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“…Because this charging current interferes with the ion current, voltages above threshold would destroy the reliability of the transient current measurements. 16) Transmittance of the TN LC cell from a He-Ne laser was also measured with a photo detector. All cells were measured by using a cross-polarizer configuration, yielding normally white (NW) mode, under an applied triangle wave with frequency 0.02 Hz and amplitude 5 V. The VHR values were measured using the VHR measurement system (Toyo).…”

Section: Experimental Methodsmentioning

confidence: 99%

Effect of Doped Insulating Nanoparticles on the Electro-Optical Characteristics of Nematic Liquid Crystals

Chen

Chao

2009

jjap

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In this paper, the transient currents and the voltage holding ratio (VHR) generated by an applied direct voltage in nematic liquid crystal (LC) cells are measured. The experimental results show that doping insulating nanoparticles such as ZnO, TiO 2 , and Si 3 N 4 in nematic LCs leads to a reduction in the moving-ion density in LC cells and drastically reduces the transient currents as well as threshold voltage. This doping method improves the electro-optical characteristics in nematic LC cells. Moreover, we found that the VHR values maintained higher than 95% in these doped LC cells. Such a high VHR observed in insulating nanoparticle-doped LC cells is a superior feature for LC display applications. #

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Section: Experimental Methodsmentioning

confidence: 99%

Effect of Doped Insulating Nanoparticles on the Electro-Optical Characteristics of Nematic Liquid Crystals

Chen

Chao

2009

jjap

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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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“…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%

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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Adequate measuring techniques for ions in liquid crystal layers

Cited by 58 publications

References 9 publications

Effect of Doped Insulating Nanoparticles on the Electro-Optical Characteristics of Nematic Liquid Crystals

Effect of Doped Insulating Nanoparticles on the Electro-Optical Characteristics of Nematic Liquid Crystals

Ion Transport and Switching Currents in Smectic Liquid Crystal Devices

Measurements of Lateral Ion Transport in LCD Cells

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