Orientation of a Liquid Crystal on a Soft Photoaligning Surface

Kurioz, Yu.; Reshetniak, V. V.; Reznikov, Yuriy

doi:10.1080/10587250210551

Cited by 29 publications

(21 citation statements)

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“…3(b)]. This feature of the easy axis gliding in PSNLC implies similar physics to the results of Kurioz et al [11,12] and Jánossy and Kósa [13]. Kurioz et al first observed the gliding of the easy axis to the polar direction owing to the rearrangement of the polymer chains.…”

Section: Resultssupporting

confidence: 79%

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Surface gliding of the easy axis of a polymer-stabilized nematic liquid crystal and its dependence on the constituent monomers

Lee

Yoon

2011

Phys. Rev. E

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We studied the easy axis gliding of a polymer-stabilized nematic liquid crystal. The easy axis of the liquid crystal was slowly reoriented in the presence of an electric field, and the gliding process was approximated to the triple exponential functions. The different dynamics is considered to be related to the morphology of the polymers formed on the surface and in the bulk. The initial orientation of the easy axis was recovered by the elastic restoring force of the polymers after removal of the electric field. The gliding angle and reorientation time were decreased with the longer constituent monomers, and this is considered to be due to the increased anchoring and reduced surface viscosity by the increased fraction of the polymers intersticed in a liquid crystal near the surface.

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Section: Resultssupporting

confidence: 79%

“…The first case is the reorientation of the thin LC layer adsorbed on the surface; the LC layer acts as a part of the surface in this case [6][7][8][9]. The second case is the reorientation of the surface polymers; the surface polymers are dragged to a new direction by the rotation of the LC [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Surface gliding of the easy axis of a polymer-stabilized nematic liquid crystal and its dependence on the constituent monomers

Lee

Yoon

2011

Phys. Rev. E

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“…This effect is caused by adsorption-desorption of LC molecules from/to the aligning layer with a weak anchoring energy and in the presence of the twist elastic torque. [16][17][18] If our assumption about different structures of the chalcogenide surface for the cases of the irradiation from the different sides is correct, the difference in the relaxation times can be explained by different director viscosities on the surface with the different structures.…”

Section: Discussionmentioning

confidence: 96%

Photoalignment in the isotropic phase of liquid crystal on chalcogenide glass film

et al. 2014

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We discovered the phenomenon of liquid crystal (LC) alignment on a photosensitive chalcogenide glass film As 20 Se 80 after irradiation of the LC in the isotropic phase with polarised light. The photoalignment was observed after cooling of the LC to the nematic phase. Quality of the photoalignment depended on an initial phase state of the LC. If the photoalignment was uniform at the irradiation of the isotropic phase of the LC that initially was pre-aligned in the nematic phase, the irradiation of the cell being filled in the isotropic phase resulted in inhomogeneous photoalignment. The orientation of the LC strongly depended on the geometry of the irradiation the LC in the cell. In the case of the direct irradiation of the chalcogenide surface, the photoorientation of the LC was stable. On the contrary, the irradiation of the chalcogenide surface through the LC layer led to the temporal photoalignment that diminished within few days. The results are explained in the frame of the model that suggests two mechanisms of photoalignment. The first one is related to a light-induced anisotropy on chalcogenide layer and the second one involves a LC in the process. We assume that an anisotropic light-induced desorption of LC molecules from the chalcogenide layer is the origin of last kind of photoalignment. The asymmetry of the photoalignment properties at the irradiation from the different sides of the chalcogenide surface is explained by producing different surface structures at the irradiation from the different sides.

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“…Additionally, weak anchoring interactions between alignment layer and NLCs cause the insufficient LC alignment stability as well as the pronounced image sticking effect. [15][16][17] In order to overcome these limitations, the current photoaligning materials [18][19][20][21][22][23][24] need to be further improved. The recently introduced polymer-surface stabilisation by reactive mesogen (RM) [25,26] and photoaligning stabilisation [27][28][29][30][31] can be promising candidate methods for the enhancement of surface anchoring.…”

Section: Introductionmentioning

confidence: 99%

Reducing driving voltage and securing electro-optic reliability of in-plane switching liquid crystal display by applying polysulfone photoalignment layer with photo-reactive mesogens

et al. 2014

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2014) Reducing driving voltage and securing electro-optic reliability of in-plane switching liquid crystal display by applying polysulfone photoalignment layer with photo-reactive mesogens, Liquid Crystals, 41:8, 1057-1064, Newly synthesised photocurable polysulfone (PSCMh) was applied as a photoalignment layer of in-plane switching liquid crystal display (IPS LCD). When the linear polarised ultraviolet light (LPUVL) was irradiated on the typical calamitic nematic liquid crystals on the PSCMh alignment layer, the liquid-crystal director was aligned perpendicular to the LPUVL. Based on the experimental results, it was realised that IPS LCD photoaligned by PSCMh with additional polymer layer associated with reactive mesogen (RM) showed a low driving voltage with reduction of 0.2 V compared to the rubbed cell and also excellent electro-optic reliability such as alignment stability, residual direct current and voltage holding ratio compared to the purely photoaligned cell. Therefore, it was concluded that the polymer stabilisation of PSCMh with RM was effective for improving IPS LCD performances.

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Orientation of a Liquid Crystal on a Soft Photoaligning Surface

Cited by 29 publications

References 0 publications

Surface gliding of the easy axis of a polymer-stabilized nematic liquid crystal and its dependence on the constituent monomers

Surface gliding of the easy axis of a polymer-stabilized nematic liquid crystal and its dependence on the constituent monomers

Photoalignment in the isotropic phase of liquid crystal on chalcogenide glass film

Reducing driving voltage and securing electro-optic reliability of in-plane switching liquid crystal display by applying polysulfone photoalignment layer with photo-reactive mesogens

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