Single-substrate cholesteric liquid crystal displays by colloidal self-assembly

Chari, Krishnan; Rankin, Charles M.; Johnson, David M.; Blanton, Thomas N.; Capurso, Robert G.

doi:10.1063/1.2167398

Cited by 36 publications

(12 citation statements)

References 11 publications

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“…In conclusion, a major technical challenge is to create flexible PDLC displays using low-cost and high throughput singlesubstrate manufacturing processes (such as coating and printing) that match the performance of glass cell liquid crystal display devices. The work reported here based on colloidal self-assembly of relatively uniform CLC microdomains represents possibly the most significant progress towards that objective that has been made to date [7][8][9][10].…”

Section: Resultsmentioning

confidence: 99%

56.4: Cholesteric PDLC Displays with Low Driving Voltage

Chari

Kowalczyk

Rankin

et al. 2006

SID Symposium Digest

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Section: Resultsmentioning

confidence: 99%

56.4: Cholesteric PDLC Displays with Low Driving Voltage

Chari

Kowalczyk

Rankin

et al. 2006

SID Symposium Digest

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“…Much research has been devoted to three-dimensional (3D) self-assembly [25], though a two-dimensional (2D) variant continues to be of interest from an exploratory perspective [47][48][49][50][51][52][53][54][55] as well as in applied technologies [1,56]. Optimal function is achieved via slab geometry in many devices, including optoelectronic/photonic materials [57][58][59][60][61], sensors [60,[62][63][64][65][66][67][68], display technologies [69][70][71], smart glass [72,73], spatial light modulators [74][75][76][77], and tunable filters [78][79][80][81]. However, dimensionality plays an essential role in the type and extent of structural order that a condensed phase can maintain [52,[82][83][84][85][86][87][88].…”

Section: Introductionmentioning

confidence: 99%

A Bidimensional Gay-Berne Calamitic Fluid: Structure and Phase Behavior in Bulk and Strongly Confined Systems

et al. 2021

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A bidimensional (2D) thermotropic liquid crystal (LC) is investigated with Molecular Dynamics (MD) simulations. The Gay-Berne mesogen with parameterization GB(3, 5, 2, 1) is used to model a calamitic system. Spatial orientation of the LC samples is probed with the nematic order parameter: a sharp isotropic-smectic (I-Sm) transition is observed at lower pressures. At higher pressures, the I-Sm transition involves an intermediate nematic phase. Topology of the orthobaric phase diagram for the 2D case differs from the 3D case in two important respects: 1) the nematic region appears at lower temperatures and slightly lower densities, and 2) the critical point occurs at lower temperature and slightly higher density. The 2D calamitic model is used to probe the structural behavior of LC samples under strong confinement when either planar or homeotropic anchoring prevails. Samples subjected to circular, square, and triangular boundaries are gradually cooled to study how orientational order emerges. Depending on anchoring mode and confining geometry, characteristic topological defects emerge. Textures in these systems are similar to those observed in experiments and simulations of lyotropic LCs.

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“…The presence of these inclusions induces a disturbance in the director orientation which typically aligns either tangentially or normally to the surface of the particles. This leads to the formation of a variety of topological defects that mediate long-range anisotropic particle-particle interactions and stabilize novel ordered structures, such as chain [6,7] and defect glass [8] in nematics or colloidal crystals [9] and isolated clusters [10] in cholesterics, with potential use in photonics [11] and in new devices [12].…”

Section: Introductionmentioning

confidence: 99%

Rheology of an Inverted Cholesteric Droplet under Shear Flow

Fadda

Gonnella

Lamura

et al. 2018

Fluids

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Abstract:The dynamics of a quasi two-dimensional isotropic droplet in a cholesteric liquid crystal medium under symmetric shear flow is studied by lattice Boltzmann simulations. We consider a geometry in which the flow direction is along the axis of the cholesteric, as this setup exhibits a significant viscoelastic response to external stress. We find that the dynamics depends on the magnitude of the shear rate, the anchoring strength of the liquid crystal at the droplet interface and the chirality. While low shear rate and weak interface anchoring the system shows a non-Newtonian behavior, a Newtonian-like response is observed at high shear rate and strong interface anchoring. This is investigated both by estimating the secondary flow profile, namely a flow emerging along the out-of-plane direction (absent in fully-Newtonian fluids, such as water) and by monitoring defect formation and dynamics, which significantly alter the rheological response of the system.

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Single-substrate cholesteric liquid crystal displays by colloidal self-assembly

Cited by 36 publications

References 11 publications

56.4: Cholesteric PDLC Displays with Low Driving Voltage

56.4: Cholesteric PDLC Displays with Low Driving Voltage

A Bidimensional Gay-Berne Calamitic Fluid: Structure and Phase Behavior in Bulk and Strongly Confined Systems

Rheology of an Inverted Cholesteric Droplet under Shear Flow

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