Accurate Measurement of the Pretilt Angle in a Liquid Crystal Cell by an Improved Crystal Rotation Method

Han, Kwan-Young; Miyashita, Tetsuya; Uchida, Tatsuo

doi:10.1080/10587259408029751

Cited by 49 publications

(14 citation statements)

References 5 publications

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“…The transmittance versus LC cell rotation curves were measured for pretilt angle calculations under latitudinal rotation from À 70°t o 70°. [31,32] In the graphs, the blue lines denote simulated data and red lines represent experimentally measured data. The high match rate between these lines indicates the reliability of the calculated pretilt angles and stability of the film.…”

Section: Resultsmentioning

confidence: 99%

“…The LC alignment state on the layer was confirmed by POM (BXP 51, Olympus) and pretilt angle measurements (Autronic TBA 107) via the crystal rotation method. [31,32] The thermal endurance of the LC alignment on the layer was evaluated by annealing from 90 to 180 °C at equal intervals of 30 °C followed by POM measurements. To analyze the anchoring energy of the LC cell of 5 μm uniform cell gap at room temperature, the capacitance-voltage graph was measured (LCR meter, Agilent 4284 A) in the range of 0-20 V. To investigate the applicability of the brush-coated LaAlZrZnO layer in various LC driving systems, the TN and VA mode LC cells, both with 5 μm cell gaps, were assembled.…”

Section: Lc Alignment States and Eo Property Evaluations For Various ...mentioning

confidence: 99%

See 1 more Smart Citation

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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Section: Resultsmentioning

confidence: 99%

Section: Lc Alignment States and Eo Property Evaluations For Various ...mentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…Before the measurement procedure in the electrooptical setup, the cell was turned in both directions in relation to the plane perpendicular to the laser beam and watched in crossed polarizers. The cell transmission dependence versus the turn direction was symmetric for S and B cells and asymmetric for H cells [32,33].…”

Section: Methodsmentioning

confidence: 99%

Measurement of the liquid crystal pretilt angle in cells with homogeneous and inhomogeneous liquid crystal director configuration

2013

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Optical and electro-optical methods of liquid crystal (LC) director pretilt angle measurement are described for LC cells with homogeneous and inhomogeneous LC director distribution. The LC pretilt on both LC substrates can have the same or opposite direction. The phase retardation difference of both extraordinary and ordinary polarized rays passing through an LC cell with homogeneous and inhomogeneous LC director distribution has been calculated versus the LC pretilt angle θ(0) on the cell's substrates in the range 0≤θ(0)≤90°. The experimental procedure for phase retardation difference determination by measurement of the LC cell transmission between crossed polarizers for cells with LC tilted alignment is described. The method developed can also be used in optical compensator design.

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“…Each cell is assembled from pairs of plates rubbed in an antiparallel fashion. The tilt angle  is 3.5 degrees, as determined by the crystal rotation method [8]. To achieve polarization independence for the shutter, two rubbed homeotropic cells of the same thickness are stacked such that the rubbing directions of cells were perpendicular to each other.…”

Section: Experimental Materialsmentioning

confidence: 99%

Dye-doped dual-frequency nematic cells as fast-switching polarization-independent shutters

Li¹,

Xiao²,

Paladugu³

et al. 2019

Opt. Express

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We present polarization-independent optical shutters with a sub-millisecond switching time. The approach utilizes dual-frequency nematics doped with a dichroic dye. Two nematic cells with orthogonal alignment are driven simultaneously by a low-frequency or highfrequency electric field to switch the shutter either into a transparent or a light-absorbing state. The switching speed is accelerated via special short pulses of high amplitude voltage. The approach can be used in a variety of electro-optical devices.

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Accurate Measurement of the Pretilt Angle in a Liquid Crystal Cell by an Improved Crystal Rotation Method

Cited by 49 publications

References 5 publications

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

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

Measurement of the liquid crystal pretilt angle in cells with homogeneous and inhomogeneous liquid crystal director configuration

Dye-doped dual-frequency nematic cells as fast-switching polarization-independent shutters

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