62.3: Reflective Bistable Smectic-A Passive Matrix LCDs

Mitrokhin, M. V.; Holter, Børre

doi:10.1889/1.2036361

Cited by 4 publications

(3 citation statements)

References 9 publications

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“…Further, the challenge of considering nonsmooth boundaries, such as those found in saw-tooth profiles or well geometries can now be considered for Smectic A materials, as they have been for nematics [24,40,23,48]. These nematic studies and many smectic studies [17,13,56,18] evidence the possibility of multi-stable states which is of particular use in bistable displays.…”

Section: Discussionmentioning

confidence: 99%

Structure of smectic-Aliquid crystals in nonuniform domains: Modeling the impact of imperfect boundaries

2020

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This paper describes, for the first time, the construction of equilibrium configurations for smectic A liquid crystals subjected to nonuniform physical boundary conditions, with two-dimensional dependence on the director and layer normal, and a nonlinear layer function. Euler-Lagrange equations are constructed that describe key properties of liquid crystals confined between two boundaries exhibiting spatial imperfections. The results of the model are shown to be consistent with previous published findings in simple domains while novel results are obtained on how the structure of the liquid crystals changes in response to boundary perturbations. Domain sizes are considered representing those currently used in applications while predictions in smaller domains at the limit of current technologies are also made. In particular, it is shown that the curvature along a boundary impacts on the liquid crystal's structure distant from the boundary feature and therefore previously developed mathematical models, that essentially reduced the problem to a single spatial dimension, cannot be used in such circumstances. Consequences for practical applications are briefly discussed.

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Section: Discussionmentioning

confidence: 99%

Structure of smectic-Aliquid crystals in nonuniform domains: Modeling the impact of imperfect boundaries

2020

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“…As can be seen from the plot, a reduction of the cell gap is beneficial for time response for both FC-HT transition and EHD instability. We have previously reported [8] that the introduction of low polar polyimide coatings effectively reduces the negative effect of chromatographic separation of the LC material in a vacuum filling possess [9], although alignment coatings are not required for the operation of SmA displays. Including a dielectric alignment coating in the display structure influences the electro-optical performance of the SmA displays, especially for displays with reduced cell gaps.…”

Section: Transmissive Modementioning

confidence: 99%

P-24: Bistable Smectic-A LCDs: Paper-Like Reflective and See-Through Transmissive Modes

Mitrokhin

Bragstad

Holter

et al. 2006

SID Symposium Digest

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EASL displays based on the effect of electrically reversible memory in Smectic‐A LC features long term image storage capability and wide viewing angle. The reflective mode of SmA displays (PolyDisplay®) features a paper‐like readability and appearance, whereas their transmissive mode (Vindauge™) offers an outstanding transmission and opens new display application areas via see‐through transparent displays. Electro‐optical performance and approaches for its optimization for reflective and transmissive modes of EASL displays are discussed in this paper.

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“…The formation of intermediate scattering levels or the ratio of the pixel areas in homeotropic and in saturated focal conic states allows one to produce a large range of gray scale capability. 9 Since bistable SmA LC devices do not require polarizers or backlights, they are quite energy efficient when compared to the Twisted Nematic ͑TN͒ or Super Twisted Nematic ͑STN͒ displays. They can also maintain high contrast and wide viewing angles.…”

mentioning

confidence: 99%

Field-induced polymer wall formation in a bistable smectic-A liquid crystal display

Büyüktanir

Gheorghiu

West

et al. 2006

Applied Physics Letters

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We developed a composite system to produce robust bistable smectic-A ͑SmA͒ liquid crystal based flexible displays by encapsulating the liquid crystal material in a polymer wall structure. While keeping all the intrinsic bistable properties of the SmA material, the field-induced polymer walls bridge the two display substrates and bring significant advantages over the polymer dispersed liquid crystal structure. Here we analyze the performance of an encapsulated pixel and demonstrate superior electro-optical characteristics, high contrast ratio, and excellent sunlight readability.

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62.3: Reflective Bistable Smectic-A Passive Matrix LCDs

Cited by 4 publications

References 9 publications

Structure of smectic-Aliquid crystals in nonuniform domains: Modeling the impact of imperfect boundaries

Structure of smectic-Aliquid crystals in nonuniform domains: Modeling the impact of imperfect boundaries

P-24: Bistable Smectic-A LCDs: Paper-Like Reflective and See-Through Transmissive Modes

Field-induced polymer wall formation in a bistable smectic-A liquid crystal display

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