Alignment Mechanism of Nematic Liquid Crystal on Rubbed Polymer Surface  Studied by Subsequent Processes of Rubbing and Photoalignment

Chung, Doo-Han; Takanishi, Yoichi; Ishikawa, Ken; Takezoe, Hideo; Park, Byoungchoo; Jung, Youngyi; Hwang, Ha-Keun; Lee, Sooman; Han, Ki-Jong; Jang, Sei‐Hum

doi:10.1143/jjap.39.l185

Cited by 19 publications

(8 citation statements)

References 23 publications

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“…There were no micro-scratches or micro-grooves on the PBA-treated surface. This finding is consistent with the results reported by Chung et al 17 AFM was applied for further investigation on the PBA-treated PI surfaces. As shown in Fig.…”

Section: Alignment-surface Propertiessupporting

confidence: 93%

Medical displays by using plasma‐beam‐alignment technology

Lee¹,

Liu²,

Chen³

et al. 2008

J Soc Info Display

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Abstract— Novel anode layer plasma within minimum chamber space was developed for non‐contact alignment process. The plasma‐treated polyimide (PI) surface showed no particle contamination and no micro‐scratches. Surface morphology was investigated by using scanning electron microscope (SEM), an atomic force microscope (AFM), and X‐ray photoemission spectroscopy. The different oxygen‐to‐carbon ratio ([O]/[C] ratio) for XPS spectra indicated a composition change after plasma treatment. Surface pretilt angles were varied from 0 to 2.1° under different plasma exposure times. Finally, a prototype 20.8‐in. QXGA IPS‐mode gray‐scale medical liquid‐crystal display was successfully demonstrated with high contrast ratio, excellent uniformity, and wide viewing angle using this new plasma‐beam‐alignment technique.

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Section: Alignment-surface Propertiessupporting

confidence: 93%

Medical displays by using plasma‐beam‐alignment technology

Lee¹,

Liu²,

Chen³

et al. 2008

J Soc Info Display

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“…After a rubbing process, microgrooves are created in this layer. The main aligning mechanism is based on shear stress induced on the alignment layer [ 22 ] and intermolecular interactions between LC and polyimide [ 23 ].…”

Section: Structure and Theoretical Basismentioning

confidence: 99%

Liquid Crystal Lensacons, Logarithmic and Linear Axicons

et al. 2014

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Until now, several attempts have been made to obtain axicons by using liquid crystals. Previous results had always a considerable deviation from the linear response and the resulting aperture is square. In addition, classical fabrications methods are expensive and only produce fixed phase profiles. In this study, a novel structure to obtain tunable axicons with a perfect conical shape and a circular aperture is proposed and theoretically studied. The proposed optical device is based on nematic liquid crystal and phase shifted electrical signals. A simulation program consisted of Finite Elements Method to solve the voltage distribution combined with the Frank-Oseen equation to solve the molecular position of the nematic liquid crystal is employed. This device is totally reconfigurable by using low voltage signals. The focus depth and the position of this one can be controlled electrically.

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“…Polyimides (PIs) are widely used as LC alignment films in the mass production of LC devices because they possess excellent optical transparency, adhesion, heat resistance, dimensional stability, and insulation . However, excessive rubbing generates static electricity and scratches, which deteriorate the transmittance attenuation of the black state. It is thus essential to optimize the rubbing process.…”

Section: Introductionmentioning

confidence: 99%

Relationship between rubbing‐induced anisotropy and surface azimuthal anchoring energy of nematic liquid crystals

et al. 2013

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The relationship between the rubbing-induced anisotropy of alignment films and the surface azimuthal anchoring energy of nematic liquid crystals was investigated using three kinds of rubbing cloths. Reflection ellipsometry revealed that the optical surface anisotropy of polyimide alignment films increases monotonically with increasing RS. The surface azimuthal anchoring energy measured by the torque balance method depends on the rubbing-induced anisotropy of alignment films. This indicates that liquid crystal molecular alignment can be controlled by monitoring the rubbing-induced optical anisotropy of alignment films when a suitable rubbing cloth is used.

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Alignment Mechanism of Nematic Liquid Crystal on Rubbed Polymer Surface Studied by Subsequent Processes of Rubbing and Photoalignment

Cited by 19 publications

References 23 publications

Medical displays by using plasma‐beam‐alignment technology

Medical displays by using plasma‐beam‐alignment technology

Liquid Crystal Lensacons, Logarithmic and Linear Axicons

Relationship between rubbing‐induced anisotropy and surface azimuthal anchoring energy of nematic liquid crystals

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