Bistable chiral tilted-homeotropic nematic liquid crystal cells

Hsu, Jy-Shan; Liang, Bau-Jy; Chen, Shu‐Hsia

doi:10.1063/1.1830681

Cited by 31 publications

(21 citation statements)

References 11 publications

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“…Because of their unique optical properties, these materials are used in several liquid-crystal-based technologies, including displays, switchable diffraction gratings, eyewear with voltage-controlled transparency, beam-steering devices, and mirror-less lasers, among others. [1][2][3][4][5][6][7][8][9][10][11][12] The understanding of the orientational structures in cholestericliquid-crystal systems, and the transitions among them, is of practical importance, as well as of fundamental interest. It is the subject of this paper, in which we study a particular cholesteric-liquid-crystal system (geometry, boundary * Author to whom correspondence should be addressed.…”

Section: Introduction and Modelmentioning

confidence: 99%

Electric-Field Induced Transitions in a Cholesteric Liquid-Crystal Film with Negative Dielectric Anisotropy

Gartland¹,

Huang²,

Lavrentovich³

et al. 2010

Jnl of Comp & Theo Nano

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A combination of analytical, numerical, and qualitative methods is used to study competing equilibrium orientational configurations in a liquid-crystal thin film. The material is a cholesteric liquid crystal and has a negative dielectric anisotropy. The system has strong homeotropic anchoring of the liquid-crystal director on the confining substrates and is subject to a voltage applied across the film thickness. A free-energy functional embodies the competing influences of the boundary conditions, the intrinsic chirality of the material, and the electric field. Attention is restricted to director fields that are functions only of the distance across the cell gap. A detailed phase and bifurcation analysis of the two equilibrium configurations of this type is presented; the control parameters are the ratio of the cell gap to the intrinsic pitch of the cholesteric and the applied voltage. The study was motivated by potential technological applications. The phase diagram contains both first-order and second-order transition lines, the former terminating at an isolated point and the latter at a triple point. The voltage-dependent nature of the total twist of the director across the cell is revealed and explained, and an effective upper bound is obtained on the ratio of cell gap to pitch for the system to support a simple voltage-driven second-order transition between the two 1-D equilibrium states.

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Section: Introduction and Modelmentioning

confidence: 99%

Electric-Field Induced Transitions in a Cholesteric Liquid-Crystal Film with Negative Dielectric Anisotropy

Gartland¹,

Huang²,

Lavrentovich³

et al. 2010

Jnl of Comp & Theo Nano

View full text Add to dashboard Cite

show abstract

“…Once displayed, the information can be memorized for a long time, ranging from seconds up to years, depending on the requirement of the application. One of the widely studied bistable N*-LC devices is the dual-frequency driven mechanism [12][13][14]. The N*-LC can be changed between the planar and the focal conic textures by applying electric fields with different frequencies.…”

Section: Introductionmentioning

confidence: 99%

Electrically induced and thermally erased properties of side‐chain liquid crystalline polymer/liquid crystal/chiral dopant composites

Huang

Geng

et al. 2007

Liquid Crystals

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2007) Electrically induced and thermally erased properties of side-chain liquid crystalline polymer/liquid crystal/chiral dopant composites, Liquid Crystals, 34:8, 949-954,The properties of synthesized side-chain liquid crystalline polymer (SCLCP)/liquid crystal (LC)/chiral dopant composites having a chiral nematic (N*) phase at room temperature were investigated by polarized optical microscopy (POM) and a UV/VIS/NIR spectrophotometer. The composite exhibited a planar texture after it was filled into cells under homogeneous boundary conditions and it was transparent. When an electric field was applied to the composite, a focal conic texture was formed and the composite became light scattering. After the electric field was turned off, the light-scattering state remained stable for some time, i.e. the light-scattering state exhibited a memory effect. The focal conic texture changed into the planar texture when the composite was heated and the composite became transparent again. Therefore, the composite had electrically induced and thermally erased properties. The SCLCP had some influence on the memory effect and on the thermo-electro-optical properties of the composite.

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“…Nowadays, the monostable device with a permissible stable state with an electric field is widely applied to mobile, monitor, and television LCDs due to its high optical performance [1]. On the other hand, the bistable device with two stable states without an electric field is widely applied to electronic books, electronic papers, and price tags because of its low power consumption [2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Dual‐mode liquid crystal devices with switchable memory and dynamic modes

Yao

Kou

Yang

et al. 2009

Journal of Information Display

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A liquid crystal device with switchable dynamic and memory modes was investigated and developed. The proposed device reveals the splay, π-twist, and bend states via selective switching among them. In the dynamic mode, the device is operated in the bend state, which exhibits a wide viewing-angle and a fast-response-time due to its self-compensated bend structure and flowaccelerated fast response time, respectively. In the memory mode, the permanent memory characteristics in the splay and π-twist sates are obtained, respectively. The switching mechanisms of the tristate device are also proposed.

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Bistable chiral tilted-homeotropic nematic liquid crystal cells

Cited by 31 publications

References 11 publications

Electric-Field Induced Transitions in a Cholesteric Liquid-Crystal Film with Negative Dielectric Anisotropy

Electric-Field Induced Transitions in a Cholesteric Liquid-Crystal Film with Negative Dielectric Anisotropy

Electrically induced and thermally erased properties of side‐chain liquid crystalline polymer/liquid crystal/chiral dopant composites

Dual‐mode liquid crystal devices with switchable memory and dynamic modes

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