Control of the pretilt angle for liquid crystal alignment using novel electrospray deposition methods with two capillaries

Kudoh, Yukihiro; Uchida, Yuta; Takahashi, Taiju

doi:10.1002/jsid.265

Cited by 4 publications

(3 citation statements)

References 21 publications

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“…[1] These droplets form due to competing interactions between surface tension and Coulombic repulsions. [2][3][4][5] ESD has been employed in several application areas, ranging from semiconductors to biotechnology, [6][7][8][9][10][11][12] as this process shows great promise as an emerging technology for surface coating applications. [1][2] With respect to photovoltaics and drug delivery, DOI: 10.1002/admi.202300982 ESD is particularly appealing for thin film coatings as it can effectively limit material loss as well as its facile production.…”

Section: Introductionmentioning

confidence: 99%

Sub‐Micron Thickness Self‐Limiting Electrospray Deposition via Voltage Bias of Spray Target

Rouf,

Park,

Singer

2024

Adv Materials Inter

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Electrospray deposition (ESD) is a technique with emerging relevance for applications requiring micro‐/nano‐scaled coatings. Self‐limiting electrospray deposition (SLED) is a regime of ESD where upon satisfying the criteria for self‐limiting behavior, the charge buildup of the material will eventually begin to repel itself until an asymptotic thickness is achieved, based primarily on the properties of the spray solution and deposited material. This work focuses on controlling the coating thickness further to achieve sub‐micron thicknesses. By applying a voltage bias of the same polarity of the spray onto the target substrate while providing a secondary grounded surface, the thickness of a payload can be manipulated for thinner and more precise thicknesses. The magnitude of the voltage bias is varied to show the effect of voltage bias on thickness, and 2‐D and 3‐D structures are used to demonstrate the generality of this technique for complex substrates. The results show how SLED can be included as a potential alternative for conformal coatings deposited at ambient conditions at the sub‐micron scale.

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Section: Introductionmentioning

confidence: 99%

Sub‐Micron Thickness Self‐Limiting Electrospray Deposition via Voltage Bias of Spray Target

Rouf,

Park,

Singer

2024

Adv Materials Inter

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“…Several methods of LC lenses fabrication are known having common approach of LC cell with refractive index gradient in the bulk of the LC layer, achieved because of applied voltage gradients (patterned electrode), inhomogeneous cell gaps, inhomogeneous polymer‐stabilized networks formation in the bulk of the LC cell (combined with nonuniform electrodes), various modes based on patterned planar and homeotropic alignment materials, etc. The special interests for application in light‐field display are technologies for tunable LC microlens' arrays creation.…”

Section: Introductionmentioning

confidence: 99%

Alignment materials with controllable anchoring energy

et al. 2018

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New polymers with photo-controllable anchoring energy and tunable pretilt angle within 90°-0°range for nematic liquid crystals alignment were developed. The functional properties of polymers are provided by the effect of photoinduced planar alignment and the presence of side hydrocarbon chains in macromolecules that create a homeotropic alignment effect. Applying photosensitive alignment layers based on polymers with side benzaldehyde and hydrocarbon groups, fabrication of optical devices with refractive index gradient, uniform cell gap, and low operation voltage is possible. The developed materials are suitable for simple fabrication of tunable liquid crystal lenses.

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“…When the ESD method was used to form an alignment film comprising numerous small domains with two types of alignment materials for the horizontal and vertical alignment, the pretilt angle was controlled using simple equipment in the atmosphere [15]. Fur- thermore, the selective coating method was proposed for the system with two types of alignment materials, for example the horizontal and vertical alignment materials [17].…”

Section: Introductionmentioning

confidence: 99%

Quasi-Black Mask for Low-Cost LCDs by Patterned Alignment Films Formed by an Electro-Spray Deposition Method

Kudoh

Uchida

Takahashi

2016

IEICE Trans. Electron.

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SUMMARYA black mask (BM) is a layer used to improve the display quality by suppressing light leakage. In general, the BM is formed by a photolithography process. In this study, a novel technique for the fabrication of a quasi-black mask (q-BM) is proposed; the q-BM was composed of vertical and hybrid orientation areas, patterned by a separation coating technique using an electro-spray deposition method. Using our technique, the q-BM can be formed easily without the additional masks used for the BM.

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Control of the pretilt angle for liquid crystal alignment using novel electrospray deposition methods with two capillaries

Cited by 4 publications

References 21 publications

Sub‐Micron Thickness Self‐Limiting Electrospray Deposition via Voltage Bias of Spray Target

Sub‐Micron Thickness Self‐Limiting Electrospray Deposition via Voltage Bias of Spray Target

Alignment materials with controllable anchoring energy

Quasi-Black Mask for Low-Cost LCDs by Patterned Alignment Films Formed by an Electro-Spray Deposition Method

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