Atomic Beam Alignment of Liquid Crystals

Chaudhari, P.; Lacey, J. A.; Lien, Shui-Chih Alan; Speidell, James L.

doi:10.1143/jjap.37.l55

Cited by 104 publications

(75 citation statements)

References 4 publications

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“…This is certainly true and understandable for devices using VAN liquid crystal, for which the standard alignment layers never had proven to be a good technique. However, even LCOS devices employing classic twisted nematic liquid crystal have a tendency to use other, contact-free methods of aligning [17] because of the nature of the silicon backplane, which is quite sensitive to scratches, electrostatic discharges and the like.…”

Section: Alignment Technologymentioning

confidence: 99%

VAN LCOS Microdisplays: A Decade of Technological Evolution

Cuypers

Smet

Calster

2011

J. Display Technol.

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Abstract-Microdisplays of the liquid crystals on silicon (LCOS)type have gone through a rapid evolution during the last decade. We present an overview of how vertically aligned nematic (VAN) LCOS have evolved from an attractive, but notoriously difficult and even infamous technology, to the mainstream microdisplay technology that it is today. At the same time, we highlight a number of remaining issues and concerns, and present some ideas of how to remedy them. Index Terms-Liquid crystals on silicon (LCOS), microdisplay, vertically aligned nematic (VAN).

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Section: Alignment Technologymentioning

confidence: 99%

VAN LCOS Microdisplays: A Decade of Technological Evolution

Cuypers

Smet

Calster

2011

J. Display Technol.

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“…However, the rubbing process generally leaves particulate impurities and electrostatic charges on the surface and this degrades the image quality of the LC devices. Various alignment methods to replace the rubbing process have been suggested such as ion beam irradiation [3] and photo-alignment methods [4][5][6] but with limited success.…”

Section: Introductionmentioning

confidence: 99%

Orientational and electro-optical properties of liquid crystal aligned with a directly spinnable carbon nanotube web

Lee

Huynh

et al. 2015

Liquid Crystals

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2015): Orientational and electro-optical properties of liquid crystal aligned with a directly spinnable carbon nanotube web, Liquid Crystals, We investigated the orientational and electro-optical properties of a nematic liquid crystal (LC) aligned with a directly spinnable carbon nanotube (CNT) web functioning both as an electrode and as an alignment layer. The LC molecules were uniformly oriented along the drawing direction of the CNT web and the spatially averaged birefringence was comparable to a rubbed polyimide sample. The CNT web sample also showed smaller residual DC and hysteresis compared to the polyimide sample.

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“…Therefore, the development of non-contact mode LC alignment technologies has been one of the most important issues and research thrusts over the past few years. Some of the techniques employed to achieve non-contact mode LC molecules alignment include ultraviolet (UV) irradiation [10,12,22,27,29,, oblique evaporation [54][55][56][57], ion beam irradiation [22,27,[58][59][60][61], Langmuir-Blodgett (LB) film [12,62,63], selfassembled monolayers (SAMs) [50,[64][65][66][67][68][69][70], photonic crystal [71,72], plasma treatment [73][74][75] and nanoimprinting [76][77][78][79][80][81].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of pseudo-pi vertical alignment mode liquid crystal devices with ultra-violet polymerisation and investigations of their electro-optical characteristics

Ho¹,

Lee²

2010

Liquid Crystals

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In this study, we applied the non-contact photo-polymerisation method in fabricating pseudo-polyimide (PI) liquid crystal (LC) devices with vertical alignment copolymer films, in the hope of solving the problems associated with traditional rubbing alignment processes. We mixed different photo-polymerisation-type acrylic monomers and negative dielectric anisotropy LC at proper weight percentages, and induced phase separation behaviour between the photo-polymerisation-type acrylic monomers and the LC molecules in the LC mixture solution through ultraviolet light irradiation, thereby forming copolymer films with vertical alignment effects. We further conducted preliminary characterisation of the alignment mechanism, photo-polymerisation, etc., of the LC molecules and investigated their interactions with alkyl acrylic monomers with different carbon chain lengths (the analogue of alkyl side chains in traditionally used vertical alignment-type PI) and electro-optical properties such as the transmittance, contrast ratio, and response time.

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Atomic Beam Alignment of Liquid Crystals

Cited by 104 publications

References 4 publications

VAN LCOS Microdisplays: A Decade of Technological Evolution

VAN LCOS Microdisplays: A Decade of Technological Evolution

Orientational and electro-optical properties of liquid crystal aligned with a directly spinnable carbon nanotube web

Fabrication of pseudo-pi vertical alignment mode liquid crystal devices with ultra-violet polymerisation and investigations of their electro-optical characteristics

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