Electrooptical and Response/Relaxation Properties of Liquid Crystal Cells   in In-plane Switching Mode with Polyvinylcinnamate Photoinduced Alignment Layer

Zhou, Ying; Sato, Susumu

doi:10.1143/jjap.37.4439

Cited by 9 publications

(5 citation statements)

References 11 publications

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“…This anchoring effect may be similar to memory effect of the nematic LC on polymer alignment layers. [14][15][16][17][18] On increasing temperature, the anchoring molecules rotated toward the electric field and tended to recover the initial orientation after turning off the field. This can explain the time-dependent transmittances of the PB cell at high temperature shown in Fig.…”

Section: Discussionmentioning

confidence: 99%

High-Density Poly(methyl methacrylate) Brushes as Anchoring Surfaces of Nematic Liquid Crystals

Tokita

Sato

Inagaki

et al. 2011

Jpn. J. Appl. Phys.

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The orientation of a nematic liquid crystal (LC) on high-density poly(methyl methacrylate) (PMMA) brushes was examined. The nematic LC was injected into the cell consisting of two substrates on which PMMA chains were grafted with a density of 0.299 chains nm-2. It showed degenerate planar orientation, which became uniform on cooling from 120 °C at a magnetic field of 1 T. At ambient temperature, the aligned LC cell showed typical electro-optical properties when driven in the in-plane switching (IPS) mode, indicating that the LC molecules anchored to the brushes with the director parallel to the magnetic field direction. In contrast, at temperatures higher than 65 °C, the transmittance of the cell was time-dependent when driven over a prolonged period, suggesting that the anchoring direction rotated toward the electric field direction. Such temperature-dependent anchoring of the LC can be associated with the viscoelasticity of the PMMA brushes.

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Section: Discussionmentioning

confidence: 99%

High-Density Poly(methyl methacrylate) Brushes as Anchoring Surfaces of Nematic Liquid Crystals

Tokita

Sato

Inagaki

et al. 2011

Jpn. J. Appl. Phys.

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“…Uchida et al [17] developed a method in which the multi-parameter fit was not required. The voltage dependence of capacitance can be expressed as [7,[17][18][19] …”

Section: Methodsmentioning

confidence: 99%

Determination of elastic constants of a binary system (7CPB+9.CN) showing nematic, induced smecticA_dand re-entrant nematic phases

Prasad

Das

2014

Liquid Crystals

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The temperature variation of the splay and bend elastic constants of a binary system exhibiting nematic-induced smectic A d and re-entrant nematic phases measured by electric field-induced Freedericksz transition method has been reported. As bend deformation is not permitted in the smectic A phase, bend elastic constant (K 33 ) could only be determined in the nematic and re-entrant nematic phases. In both the nematic phases, the splay elastic constant has the same order of magnitude and does not show any pretransitional effect. However, in the induced smectic A d phase, the value of K 11 is about one to two orders higher than that in the nematic phases. The bend elastic constant shows a strong pretransitional effect near the nematic-smectic and smectic-re-entrant nematic phase transitions. The influence of the presence of the induced smectic phase is observed even in those mixtures which have no induced smectic phases. As the smectic phase is approached, the ratio K 33 /K 11 increases rapidly and diverges to infinity.

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“…The hysteresis characteristics were observed with increasing and decreasing voltages. The in-plane switching mode cell using the PVCi surface has also been reported to exhibit a hysteresis characteristic [33,34]. It has also been reported that the high viscosity of the gliding LC molecules on the surface caused a very slow response [35][36][37].…”

Section: V-t Curvesmentioning

confidence: 97%

Electro-Optical Characteristics of Quasi-Homogeneous Cell in Twisted Nematic Mode

Yamaguchi

Sakamoto

2023

Symmetry

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A liquid crystal (LC) director distribution was numerically analyzed in 90-degree twisted nematic (TN) LC cells with a symmetric and an asymmetric azimuthal anchoring strength of the alignment substrate and the influence of anchoring strength on the electro-optical property of the TN cell was evaluated. The twist angle decreased with decreasing azimuthal anchoring strength and the LC orientation changed to a homogeneous orientation with the twist angle of 0 degrees in the LC cell with asymmetric azimuthal anchoring strength, specifically with the strong anchoring substrate and the weak anchoring substrate below a critical strength. The asymmetric anchoring LC cell was fabricated by using a poly (vinyl cinnamate) alignment substrate as the weak anchoring surface and a polyimide alignment substrate as the strong anchoring surface. The LC cell performed the dark–bright–dark switching of the transmittance in the crossed polarizers, since the homogeneous LC orientation changed to the TN orientation again with increasing the applied voltage. Therefore, it was experimentally confirmed that LC molecules rotated at 90 degrees in the plane on the alignment surface by the electric field perpendicular to the weak anchoring substrate.

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Electrooptical and Response/Relaxation Properties of Liquid Crystal Cells in In-plane Switching Mode with Polyvinylcinnamate Photoinduced Alignment Layer

Cited by 9 publications

References 11 publications

High-Density Poly(methyl methacrylate) Brushes as Anchoring Surfaces of Nematic Liquid Crystals

High-Density Poly(methyl methacrylate) Brushes as Anchoring Surfaces of Nematic Liquid Crystals

Determination of elastic constants of a binary system (7CPB+9.CN) showing nematic, induced smecticA_dand re-entrant nematic phases

Electro-Optical Characteristics of Quasi-Homogeneous Cell in Twisted Nematic Mode

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Electrooptical and Response/Relaxation Properties of Liquid Crystal Cells in In-plane Switching Mode with Polyvinylcinnamate Photoinduced Alignment Layer

Cited by 9 publications

References 11 publications

High-Density Poly(methyl methacrylate) Brushes as Anchoring Surfaces of Nematic Liquid Crystals

High-Density Poly(methyl methacrylate) Brushes as Anchoring Surfaces of Nematic Liquid Crystals

Determination of elastic constants of a binary system (7CPB+9.CN) showing nematic, induced smecticAdand re-entrant nematic phases

Electro-Optical Characteristics of Quasi-Homogeneous Cell in Twisted Nematic Mode

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Product

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Determination of elastic constants of a binary system (7CPB+9.CN) showing nematic, induced smecticA_dand re-entrant nematic phases