Fundamentals of Liquid Crystal Devices

Wu, Shin‐Tson; Yang, Deng‐Ke

doi:10.1002/0470032030

Cited by 810 publications

(532 citation statements)

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“…To verify the performance of the proposed driving method, the Ericksen-Leslie equation coupled with the Laplace equation was solved numerically using the finite-element method [15]. The Ericksen-Leslie equation is generally used to describe the motion of LC molecules.…”

Section: Calculation Results and Discussionmentioning

confidence: 99%

Viewing angle control and fast switching of a hybrid-aligned liquid crystal cell using a vertical bias field

Park

Choi

Kim

et al. 2016

Journal of Information Display

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Proposed herein is a method of controlling the viewing angle in a hybrid-aligned liquid crystal (LC) cell using a vertical bias electric field. Using the proposed method, the viewing angle can be continuously controlled by changing the bias voltage. A vertical bias electric field is applied to the cell for a wide viewing angle whereas no bias electric field is applied for a narrow viewing angle. The proposed cell shows a submillisecond response time.

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Section: Calculation Results and Discussionmentioning

confidence: 99%

Viewing angle control and fast switching of a hybrid-aligned liquid crystal cell using a vertical bias field

Park

Choi

Kim

et al. 2016

Journal of Information Display

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“…22 Dividing the entire liquid crystal layer into N (N=100) sublayers along the z direction, the upper and the lower substrates correspond to the Nth and the 1st sub-layer, respectively. In calculations, the material parameters of the nematic liquid crystal E7 are shown in Table I.…”

Section: Numerical Simulationmentioning

confidence: 99%

Influence of rubbing-alignment on microwave modulation induced by liquid crystal

Xing

Zhou

et al. 2015

AIP Advances

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The microwave modulation induced by liquid crystal is decided by the liquid crystal director distribution under an external applied voltage. The rubbing-alignment of substrate has an effect on the liquid crystal director, which must result in the change of microwave phase-shift. To illustrate the influence of rubbing-alignment on the microwave phase-shift, the microwave modulation property of twisted nematic liquid crystal is researched adopting the elastic theory of liquid crystal and the finite-difference iterative method. The variations of microwave phase-shift per unit-length for different pre-tilt and pre-twist angles of liquid crystal on the substrate surface and anchoring energy strengths with the applied voltage are numerically simulated. The result indicates that with the increase of pre-tilt angle and with the decrease of anchoring energy strength the weak anchoring twisted cell with pre-twisted angle 90° relative to the strong anchoring non-twisted cell can increase the microwave phase-shift per unit-length. As a result, for achieving the maximum microwave modulation, the weak anchoring twisted cell with pre-tilt angle 5° and anchoring energy strength 1×10−5J/m2 should be selected, which provides a reliably theoretical foundation for the design of liquid crystal microwave modulator.

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“…Besides its popularity as display materials, they are present in high strength plastics, snail slime, detergents, textile fibers, components of crude oil, insect wings, eye shadow and even lipstick [52]. The scientific interest in LC materials was fuelled by the diverse application potentials that these materials offered, especially for tunable optical devices such as LC based displays [53,54]. Simultaneously, the development of LC theory initiated, most notable among them being the Maier-Saupe microscopical theory [55] and the de Gennes phenomenological model [56], based on the Landau theory.…”

Section: Liquid Crystal Mesophasesmentioning

confidence: 99%

Nematic Liquid Crystals and Nematic Colloids in Microfluidic Environment

Sengupta

Herminghaus

Bahr

2011

Molecular Crystals and Liquid Crystals

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Where the mind is without fear and the head is held high;Where knowledge is free;Where the world has not been broken up into fragments by narrow domestic walls;Where words come out from the depth of truth;Where tireless striving stretches its arms towards perfection;Where the clear stream of reason has not lost its way into the dreary desert sand of dead habit;Where the mind is led forward by thee into ever-widening thought and actionInto that heaven of freedom, my Father, let my country awake.Rabindranath Tagore (1861Tagore ( -1941 To my parents, my brother, and all the sacrifices they made for me AbstractThe doctoral thesis presented here is one of the first systematic attempts to unravel the wonderful world of liquid crystals within microfluidic confinements, typically channels with dimensions of tens of micrometers. The present work is based on experiments with a roomtemperature nematic liquid crystal, 5CB, and its colloidal dispersions within microfluidic devices of rectangular cross-section, fabricated using standard techniques of soft lithography. To begin with, a combination of physical and chemical methods was employed to create well defined boundary conditions for investigating the flow experiments. The walls of the microchannels were functionalized to induce different kinds of surface anchoring of the 5CB molecules: degenerate planar, uniform planar, and homeotropic surface anchoring. Channels possessing composite anchoring conditions (hybrid) were additionally fabricated, e. g. homeotropic and uniform planar anchoring within the same channel. On filling the microchannels with 5CB in the isotropic phase, different equilibrium configurations of the nematic director resulted, as the sample cooled down to nematic phase. For a given surface anchoring, the equilibrium director configuration varied also with the channel aspect ratio. The static director field within the channel registered the initial conditions for the flow experiments. The static and i ii dynamic experiments have been analyzed using a combination of polarization, and confocal fluorescence microscopy techniques, along with particle tracking method for measuring the flow speeds. Additionally, dual-focus fluorescence correlation spectroscopy is introduced as a generic velocimetry tool for liquid crystal flows.The flow of nematic liquid crystals is inherently complex due to the coupling between the flow and the nematic director. The presence of the four confining walls and the nature of surface anchoring on them complicate the flow-director interactions further. In microchannels possessing degenerate planar anchoring, four different flow-induced defect textures were identified with increasing Ericksen number: π-walls, disclination lines pinned to the channel walls, disclination lines with one pinned and one freely suspended end, and disclination loops freely flowing in a chaotic manner. However, such textures and sequence of defects were not observed for flows within channels with homogeneous anchoring.Using experiments and numerical modeling...

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Fundamentals of Liquid Crystal Devices

Cited by 810 publications

References 0 publications

Viewing angle control and fast switching of a hybrid-aligned liquid crystal cell using a vertical bias field

Viewing angle control and fast switching of a hybrid-aligned liquid crystal cell using a vertical bias field

Influence of rubbing-alignment on microwave modulation induced by liquid crystal

Nematic Liquid Crystals and Nematic Colloids in Microfluidic Environment

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