Advancements of vertically aligned liquid crystal displays

Kumar, Pankaj; Jaggi, Chinky; Sharma, Vandna; Raina, K. K.

doi:10.1016/j.micron.2015.11.001

Cited by 22 publications

(12 citation statements)

References 80 publications

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“…When V was 10 V (frequency f = 1 kHz), the rise and decay times of the 0.1 wt %-gelator-doped negative LC cell were 49.6 and 15.6 ms, respectively. The rise and decay times are defined as the time needed for the transmittance to change from 10% to 90% and from 90% to 10%, respectively [ 35 , 36 ]. The VA-negative LC cell had a similar decay time to that of the doped LC cell, but a longer rise time (247 ms) than the doped cell.…”

Section: Resultsmentioning

confidence: 99%

Fast Response and Spontaneous Alignment in Liquid Crystals Doped with 12-Hydroxystearic Acid Gelators

Lin

Wang

et al. 2018

Materials

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The spontaneous vertical alignment of liquid crystals (LCs) in gelator (12-hydroxystearic acid)-doped LC cells was studied. Gelator-induced alignment can be used in both positive and negative LC cells. The electro-optical characteristics of the gelator-doped negative LC cell were similar to those of an LC cell that contained a vertically aligned (VA) host. The rise time of the gelator-doped LC cell was two orders of magnitude shorter than that of the VA host LC cell. The experimental results indicate that the gelator-induced vertical alignment of LC molecules occurred not only on the surface of the indium tin oxide (ITO) but also on the homogeneous alignment layer. Various LC alignments (planar, hybrid, multistable hybrid, and vertical alignments) were achieved by modulating the doped gelator concentrations. The multistable characteristic of LCs doped with the gelator is also presented. The alignment by doping with a gelator reduces the manufacturing costs and provides a means of fabricating fast-responding, flexible LC displays using a low-temperature process.

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Section: Resultsmentioning

confidence: 99%

Fast Response and Spontaneous Alignment in Liquid Crystals Doped with 12-Hydroxystearic Acid Gelators

Lin

Wang

et al. 2018

Materials

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“…This technique fetched revolutionary changes in the field of liquid crystal displays (LCDs). Various alignment modes, viz., planar, twisted nematic, , VA, in-plane switching (IPS), and fringe-field switching (FFS), are used in LC cells employed for LCDs. In the LC cells, twist, vertical, and splay alignments of the LC molecules are formed in the off-state of the applied field depending on the geometry of the LC cells.…”

Section: Introductionmentioning

confidence: 99%

Zinc Oleate Nanorod-Induced Vertical Alignment of Nematic Liquid Crystal

2022

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Nanocomposite zinc oxide nanorods capped with oleic acid (ZOR) with positive dielectric anisotropy liquid crystal (LC) 4′-octyl-4biphenylcarbonitrile (8CB) filled in unaligned cells exhibit homeotropic alignment of host LC molecules. Further, systematic investigation of the textural, dielectric, and conductivity properties of nanocomposites filled in planar cells is performed with increasing concentration of nanorods. At a nanorod concentration ≤0.2 wt % in 8CB, the order parameter of nanocomposite samples is found to be increasing and ionic conductivity is found to be decreasing as compared to pure LC. Beyond 0.3 wt % concentration of nanorods in 8CB, vertical alignment (VA) of host LC is observed even in a planar aligned cell. The VA of LC molecules in ZOR nanocomposites is confirmed through attenuated total reflection−Fourier transform infrared absorption spectra studies.

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“…In a LC cell consisting of suspensions of nanoparticles (NPs) in the LC matrix, the dispersed NPs give a perturbation to the self‐assembly property of LCs and generate plenty of defects in the LC phase. Doping nematic LCs with NPs has led to many promising LC electro‐optical characteristics including low driving voltages …”

Section: Introductionmentioning

confidence: 99%

“…Doping nematic LCs with NPs has led to many promising LC electro-optical characteristics including low driving voltages. [31][32][33][34][35][36][37] In the present work, the LBL ultrathin films of the PEI and polyanion [polystyrene sulphonate (PSS)]/polycation [polyallylamine hydrochloride (PAH)] were prepared and then used as LC alignment layers for LCDs. The polarized optical microscopy, conoscopy, and electro-optical studies confirmed that the LC molecules were perfectly vertical aligned on LBL film.…”

Section: Introductionmentioning

confidence: 99%

Homeotropic alignment of liquid crystals on ITO surface using LBL assembly

Chandrashekhar

Park

2018

J Soc Info Display

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In this work, the very thin layer‐by‐layer (LBL) film that was constructed by dip coating method on indium tin oxide surface can be used in liquid crystal (LC) displays devices. The obtained results indicate that the ultrathin LBL film shows the homeotropic alignment layer, and a uniform vertical alignment of LC molecules was gained very easily. The progress of vertical‐aligned LC cells with a LBL layer was evaluated. The obtained threshold voltage and response time of the LC cell were 2.472 V and 12.5 ms, respectively. So, the competitive performance of the LC cell could allow new sign at a low‐cost budget with rubbing process in LC display technology.

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Advancements of vertically aligned liquid crystal displays

Cited by 22 publications

References 80 publications

Fast Response and Spontaneous Alignment in Liquid Crystals Doped with 12-Hydroxystearic Acid Gelators

Fast Response and Spontaneous Alignment in Liquid Crystals Doped with 12-Hydroxystearic Acid Gelators

Zinc Oleate Nanorod-Induced Vertical Alignment of Nematic Liquid Crystal

Homeotropic alignment of liquid crystals on ITO surface using LBL assembly

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