Capacitive techniques to monitor anchoring energy in liquid crystal-based sensors

Namkung, Jun; Zou, Yang; Hassanzadeh, Alireza; Abu-Abed, Alaeddin S.; Lindquist, Robert G.

doi:10.1109/sas.2009.4801789

Cited by 1 publication

(2 citation statements)

References 13 publications

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“…Uniform liquid crystal (LC) alignment is a core technology for advanced LC device applications. [1][2][3][4] In addition, implementing various LC driving modes is important for achieving electrooptical (EO) performance according to the varying needs of customers; since the LC driving mode is controlled by the pretilt angle of the LC alignment layer, there have been many reported attempts to control it. [5][6][7][8] Accordingly, deposition of the film used as the alignment layer and an alignment treatment process to create characteristics that induce uniform LC alignment with diverse alignment states must be achieved.…”

Section: Introductionmentioning

confidence: 99%

“…Uniform liquid crystal (LC) alignment is a core technology for advanced LC device applications [1–4] . In addition, implementing various LC driving modes is important for achieving electro‐optical (EO) performance according to the varying needs of customers; since the LC driving mode is controlled by the pretilt angle of the LC alignment layer, there have been many reported attempts to control it [5–8] .…”

Section: Introductionmentioning

confidence: 99%

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Tunable Liquid Crystal Alignment and Driving Mode on Lanthanum Aluminum Zirconium Zinc‐Oxide Thin Film Achieved by Convenient Brush‐Coating Method

Lee

Kim

et al. 2022

ChemNanoMat

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Tunable liquid crystal (LC) alignment with twisted nematic (TN) and vertical alignment (VA) driving modes is achieved by a convenient brush-coating method. The brushcoating process combines film deposition and alignment treatment processes, and lanthanum aluminum zirconium zinc oxide (LaAlZrZnO) is used for the LC alignment layer. Xray photoelectron spectroscopy results confirm LaAlZrZnO film formation with fine optical transparency. Atomic force microscopy and line profile data indicate nano/micro surface structure with dense or directional morphologies induced by shear stresses according to film curing temperature. Lowtemperature-cured films exhibit hydrophobic properties with low surface energy, whereas high-temperature-cured films show hydrophilicity with high surface energy. The geometric constraints and chemical affinities of the films induce homeotropic and homogeneous LC alignments on the surface according to the film curing temperature, respectively. The LC alignment state is verified by polarized optical microscopy and pretilt angle analysis. The brush-coated LaAlZrZnO film demonstrates high thermal budget for advanced LC systems. The VA-mode and TN-mode LC cells based on the LaAlZrZnO film enable high electro-optical performances and low power consumption. Therefore, the brush-coating method is expected to be adoptable for nextgeneration LC device applications.

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