Towards an optimal model for a bistable nematic liquid crystal display device

Cummings, L. J.; Cai, C.; Kondic, Lou

doi:10.1007/s10665-012-9607-4

Cited by 7 publications

(27 citation statements)

References 20 publications

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“…We follow several authors (e.g. Davidson & Mottram [3], Cummings et al [12,13], Kedney & Leslie [14]) in assuming that the system evolves in the direction that minimizes its total free energy (a gradient flow). This approach leads to the following time dependent problem:…”

Section: Mathematical Modelmentioning

confidence: 99%

“…We choose values of A 0 and A 1 that correspond to "weak anchoring" (A * {0,h * } ∼ 10 −6 N m −1 ). In addition, we expose any behavior due to different anchoring conditions at each substrate by setting A 0 = A 1 : in all simulations presented in this paper we take A 0 = 5.0, A 1 = 2.4, as used in [13].…”

Section: A Solution Schemementioning

confidence: 99%

“…Theoretical investigations of bistable devices have been carried out by many authors: see, eg. [3,[12][13][14] and references therein. In [12], bistability is obtained in a special case where the anchoring angles are π/2 out of phase and the anchoring strengths are the same at both boundaries; switching between the states is obtained through the application of a transient electric field and in particular, two-way switching is possible for weak anchoring only.…”

Section: Effect Of Gliding On a Bistable Systemmentioning

confidence: 99%

“…In [12], bistability is obtained in a special case where the anchoring angles are π/2 out of phase and the anchoring strengths are the same at both boundaries; switching between the states is obtained through the application of a transient electric field and in particular, two-way switching is possible for weak anchoring only. In [13] (12); here f (a) has three roots, only two of which represent stable solutions, as discussed below. With anchoring strengths fixed, we find that whether the system specified by Eqs.…”

Section: Effect Of Gliding On a Bistable Systemmentioning

confidence: 99%

“…(Gliding should not, however, be an issue for such devices in only short term or intermittent use.) Another situation where gliding could be an issue is in polymer-based devices that use bistable technology [3,[12][13][14][15][16]. In a bistable device, the NLC layer can sustain two stable field-free director configurations that are optically distinct, in the absence of an applied field.…”

Section: Introductionmentioning

confidence: 99%

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Substrate-induced gliding in a nematic liquid crystal layer

2015

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We consider the interaction between nematic liquid crystals (NLCs) and polymer substrates. Such substrates can interact with NLCs, exhibiting a phenomenon known as director gliding: the preferred orientation of the NLC molecules at the interface changes on time scales that are slow relative to the elastic relaxation time scale of the NLC. We present two models for gliding, inspired by experiments that investigate the interaction between the NLC and a polymer substrate. These models, though simple, lead to nontrivial results, including loss of bistability under gliding. Perhaps surprisingly, we find that externally imposed switching between the steady states of a bistable system may reverse the effect of gliding, preventing loss of bistability if switching is sufficiently frequent. Our findings may be of relevance to a variety of technological applications involving liquid crystal devices, and particularly to a new generation of flexible liquid crystal displays that implement polymeric substrates.

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Section: Mathematical Modelmentioning

confidence: 99%

Section: A Solution Schemementioning

confidence: 99%

Section: Effect Of Gliding On a Bistable Systemmentioning

confidence: 99%

Section: Effect Of Gliding On a Bistable Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Substrate-induced gliding in a nematic liquid crystal layer

2015

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Electric field driven transformations of orientational structure in chiral nematic systems with large flexoelectricity

Oskirko

Ul’yanov

Val’kov

2019

J. Phys.: Conf. Ser.

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Transformation of the orientational structure in a plane-parallel cell of a cholesteric liquid crystal, was studied depending on the magnitude of the voltage applied to the boundary planes of the cell. The equilibrium configuration of the liquid crystal director field was found minimizing the free energy both analitically and numerically. We took into account the orientational elastic energy in the volume and at the cell boundaries, the energy of an inhomogeneous electric field, and the flexoelectric effect. Systems with large flexoelectric coefficient were studied in detail. It was found, that when small voltages are applied to the cell boundaries, a continuous Fredericks transition occurs first, and then, when certain characteristic voltage is achieved, a significant jump-like change in the orientational structure takes place, and this structure gradually changes with the further voltage increase. It is shown that various scenarios of transformation of the orientational structure can be implemented depending on the actual values of the set of material parameters of the system studied. The discovered ability to control the structure of a liquid crystal in a cell can find use in various technical devices.

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Bifurcation properties of nematic liquid crystals exposed to an electric field: Switchability, bistability, and multistability

2013

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Bistable liquid crystal displays (LCDs) offer the potential for considerable power savings compared with conventional (monostable) LCDs. The existence of two (or more) stable field-free states that are optically distinct means that contrast can be maintained in a display without an externally applied electric field. An applied field is required only to switch the device from one state to the other, as needed. In this paper we examine the basic physical principles involved in generating multiple stable states and the switching between these states. We consider a two-dimensional geometry in which variable surface anchoring conditions are used to control the steady-state solutions and explore how different anchoring conditions can influence the number and type of solutions and whether or not switching is possible between the states. We find a wide range of possible behaviors, including bistability, tristability, and tetrastability, and investigate how the solution landscape changes as the boundary conditions are tuned.

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Towards an optimal model for a bistable nematic liquid crystal display device

Cited by 7 publications

References 20 publications

Substrate-induced gliding in a nematic liquid crystal layer

Substrate-induced gliding in a nematic liquid crystal layer

Electric field driven transformations of orientational structure in chiral nematic systems with large flexoelectricity

Bifurcation properties of nematic liquid crystals exposed to an electric field: Switchability, bistability, and multistability

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