Bistable Liquid Crystal Displays

Jones, Celina

doi:10.1007/978-3-319-14346-0_92

Cited by 4 publications

(5 citation statements)

References 64 publications

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“…This causes the latching of the ferroelectric state. 34 The latching of the ferroelectric state prevents the change of the molecular orientation between the + -P and À -P state through the formation and movement of the ferroelectric domains. As a result, as the bias electric field strength increases, the value of the measured electrical permittivity decreases in the ferronematic phase.…”

Section: Resultsmentioning

confidence: 99%

Ferroelectricity in a nematic liquid crystal under a direct current electric field

Mrukiewicz

Perkowski

Karcz

et al. 2023

Phys. Chem. Chem. Phys.

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Section: Resultsmentioning

confidence: 99%

Ferroelectricity in a nematic liquid crystal under a direct current electric field

Mrukiewicz

Perkowski

Karcz

et al. 2023

Phys. Chem. Chem. Phys.

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“…Rather than consider the defects as unwanted artefacts of poor device design, Bigelow and Kashnow [19] considered the deliberate use of energetically equivalent but homotopically distinct twist states to form a bistable device. At that time, bistability showed substantial promise for highly multiplexed displays [21] with more than a score of rows to be addressed because of the inherent non-linearity of the liquid crystal arrangement, and without the use of an additional semiconductor element such as a thin-film-transistor (TFT). In addition to showing the usual transient switching response to an applied electric field, bistable devices can also be latched between at least two optically distinct states.…”

Section: Introductionmentioning

confidence: 99%

“…Although these initial attempts proved impractical, the use of topological defects to separate bistable states with different director profiles was a subject of much interest for several decades: the defect-mediated transition between states of different homotopy created a threshold voltage, and hence promised unlimited addressing without TFT. This drive stimulated attempts to use defects to induce vertical and horizontal bistable states in a nematic liquid crystal [21,22], such as those that form in parallel-aligned high pretilt nematic devices shown in Figure 1b. Such devices were the first to show zenithal bistability, where the term zenithal refers to the out of plane angle that the director makes with respect to the device plane in the two bistable states.…”

Section: Introductionmentioning

confidence: 99%

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Defect Dynamics in Anomalous Latching of a Grating Aligned Bistable Nematic Liquid Crystal Device

Jones

Gradwell

et al. 2022

Crystals

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Deliberate manipulation of topological defects is of particular interest for liquid crystal applications. For example, surface bistability occurs in the grating aligned Zenithal Bistable Device due to the stabilisation of ±½ defects at the points of high surface curvature. Conventional latching between continuous and defect states has previously been simulated satisfactorily using Q-tensor models that include the effect of weak-anchoring and flexoelectricity. However, experimental studies show that some arrangements lead to anomalous latching regimes. The Q-tensor model is used to show that such effects occur when the defects become detached from the surface and have more complex paths in the bulk of the sample.

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“…It is simple to calculate the transmission of an LC cell using matrix formulation. [87] First we consider the incident light. Normally LCs are implemented with polarizers.…”

Section: Liquid Crystalsmentioning

confidence: 99%

Optimized vivid color and tunable grating plasmonic reflector

Luisa Amadeu Ribeiro

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Ata da defesa com as respectivas assinaturas dos membros encontra-se no SIGA/Sistema de Fluxo de Dissertac ¸ão/Tese e na Secretaria do Programa da Unidade Campinas, SP 2021 taxes, specially those who will never read this and who, unfortunately, will never even step a foot on a puplic university. Science is important, research in public university is important, now probably more then ever. Every scientist I have met during this years is a fighter and extremely hard worker, all I want as a scientist is to make them justice. Thank you. And to everybody that thinks science or puplic education is a waste of money we will fight for you, even if you do not believe in us. ResumoCores são de grande importância para a forma como os humanos percebem e interagem com o mundo a seu redor. Por essa razão, desde os primórdios da civilizac ¸ão, a sociedade busca replicar as belas cores vistas na natureza. Devido a suas propriedades únicas refletores plasmônicos têm sido estudados como uma maneira de aumentar a resoluc ¸ão e a economia de energia de displays de cores. Nesse trabalho, protótipos de refletores plasmônicos foram simulados e fabricados com o objetivo de obter cores vividas. Dois tipos de refletores foram estudados: refletores permanentes com qualidade de cores otimizada e sintonizáveis com variac ¸ão de cor otimizada. Aqui, houve sucesso em replicar os resultados das simulac ¸ões, em obter uma grande variedade de cores vivas em refletores permanentes e em fabricar algumas amostras sintonizáveis com cores de qualidade satisfatória e boa variabilidade de cor. Para isso, a dependência do Cristal Líquido como a tensão elétrica aplicada foi estudada e os parâmetros de fabricac ¸ão por Litografia por Feixe de Elétrons e por Corrosão por Plasma de Ion Reativos foram refinados até a precisão de alguns nm. Ademais, para obter o acordo desejado com as simulac ¸ões, algumas mudanc ¸as no modelo original foram necessárias para incluir a presenc ¸a de uma camada de óxido de Silício nativo no substrato e a dependência das constantes óticas do filme fino de Alumínio com as características do filme.

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Bistable Liquid Crystal Displays

Cited by 4 publications

References 64 publications

Ferroelectricity in a nematic liquid crystal under a direct current electric field

Ferroelectricity in a nematic liquid crystal under a direct current electric field

Defect Dynamics in Anomalous Latching of a Grating Aligned Bistable Nematic Liquid Crystal Device

Optimized vivid color and tunable grating plasmonic reflector

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