Stability Criterion for V-Shaped Characteristics in FLC and AFLC

Pauwels, Herman; Adamski, Artur

doi:10.1080/00150190214444

Cited by 4 publications

(3 citation statements)

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“…We think that the cross-linked enes behave like a new surface and may provide additional free energy term which makes the FLC molecules lie in a single potential minimum, 23,25,26) the position of which depends on the applied field, similar to the case of regular CDR switching FLCs. [27][28][29] We found that the sample does not show any memory behavior if the thiols are not bound to enes in the inter-layer space, even when the thiols in the intra-layer space are oriented parallel to LC molecules, as in the case of the unpolymerized sample. 23) Therefore, the thiols contribute to the memory behavior of samples only when they are in the intra-layer space parallel to the FLCs with one end bound to the polymerized enes in the inter-layer space.…”

Section: Resultsmentioning

confidence: 79%

Realization of Grayscale Memory Operation in a Step-Growth Based Polymer-Stabilized Ferroelectric Liquid Crystal System

Lee¹,

Lim²,

Kwon

et al. 2006

Jpn. J. Appl. Phys.

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A grayscale memory states operation can be realized in which the liquid crystal directors are uniformly aligned in each state. This operation is realized by a specific morphology of polymers obtained through step-growth polymerization of a thiol–ene stabilizing the ferroelectric liquid crystal system. The continuous director rotation (CDR) of liquid crystal (LC) molecules as well as the grayscale memory behavior is observed where the LC directors are oriented uniformly in each state. The memory operation is due to the interaction of LC molecules with the thiols intercalated in the smectic layer with one end of each thiol bound to the polymerized ene in the inter-layer planes. The morphology of the polymer in the liquid crystal plays a crucial role in the existence of grayscale memory behavior, and the morphology depends strongly on the phase of the sample when the thiol-ene monomers are polymerized. A new mechanism is suggested for the CDR motion of the ferroelectric liquid crystal (FLC).

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Section: Resultsmentioning

confidence: 79%

Realization of Grayscale Memory Operation in a Step-Growth Based Polymer-Stabilized Ferroelectric Liquid Crystal System

Lee¹,

Lim²,

Kwon

et al. 2006

Jpn. J. Appl. Phys.

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“…Various models to describe the exact configuration and mechanism of the hysteresis-free switching (V-shape switching) were suggested by various groups. [3][4][5][6][7][8][9][10][11][12][13][14] Recently, Blinov et al has suggested a model in which the hysteresis-free switching is merely an apparent phenomenon that appears only when the transmittance is plotted as a function of the total voltage applied to the liquid crystal (LC) cell, including the insulating polymer layer. [15][16][17] On the other hand, the transmittance vs the voltage across the pure LC layer always shows normal hysteresis.…”

Section: Introductionmentioning

confidence: 99%

Study of the Hysteretic Behavior in Polymer-Stabilized Ferroelectric Liquid Crystal System

Lee

Lim

2005

Jpn. J. Appl. Phys.

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We have studied the hysteresis-free switching behaviors of a polymer-stabilized ferroelectric liquid crystal (PSFLC) as well as a pure ferroelectric liquid crystal (FLC) system and found that they coincided with the model suggested by Blinov et al. [Phys. Rev. E 66 (2002) 021701] The hysteresis inversion frequency was promoted to up to 7000 Hz by connecting an external capacitor and resistor in series. In addition, the influence of temperature on the hysteresis-free switching of the cell could be optimized.

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“…However, the AFLC state, to which the cell relaxes, cannot give rise to thresholdless/V-shaped switching [17][18][19]. The fact that the slopes overlap is caused by the interaction of surfaces with the continuous director reorientation between two F-states, giving the illusion of a V-shaped-like characteristic.…”

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confidence: 99%

Alignment and switching of AFLC materials using various boundary conditions

et al. 2005

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We have systematically studied the quality of bookshelf alignment and electro-optic characteristics of two antiferroelectric liquid crystal materials in cells with various boundary conditions. The electro-optic characteristics of the materials studied depend strongly on both the liquid crystal materials and the boundary conditions at the supporting substrates. We have compared a number of observations in these cells: the tendency to form AFLC domains in the virgin state and after switching; the surface electroclinic effect (SEC effect); the transmission-voltage characteristics (TV) when driven with triangular-and square-wave voltages at various frequencies; the threshold field and the conditions for relaxation to the AFLC state. The set of samples includes specially designed and manufactured test cells with different polyimides as alignment layers, treated with varying rubbing strengths. We discuss the significance of various factors and show the importance of simultaneously optimizing both materials and cell parameters for AFLC applications.

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Stability Criterion for V-Shaped Characteristics in FLC and AFLC

Cited by 4 publications

References 0 publications

Realization of Grayscale Memory Operation in a Step-Growth Based Polymer-Stabilized Ferroelectric Liquid Crystal System

Realization of Grayscale Memory Operation in a Step-Growth Based Polymer-Stabilized Ferroelectric Liquid Crystal System

Study of the Hysteretic Behavior in Polymer-Stabilized Ferroelectric Liquid Crystal System

Alignment and switching of AFLC materials using various boundary conditions

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