Polymer Dispersed Liquid Crystals for Display Application

Doane, J. William; Golemme, Attilio; West, John L.; Whitehead, J. B.; Wu, Baogang

doi:10.1080/00268948808082211

Cited by 354 publications

(179 citation statements)

References 14 publications

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“…This is also the case for some anthraquinone compounds 3 although the order parameters in these cases are generally less than for the azo compounds because of the smaller l/b ratio of the anthraquinone systems. For the same reason naphtalene compounds have shown relatively low order parameters since these are biaxial flat ring structures with an even lower l/b ratio [12].…”

Section: Introductionmentioning

confidence: 90%

“…In particular, the alignment of the dipole moment of the dye with the director of the LC offers the prospect of a coloured liquid crystal display (LCD) that can be switched to a transparent state in an on-off fashion with an external electric field [1][2][3][4]. Additionally, it has been observed that the electro-optic response time of nematic LCs can be improved by dye dopants with large dipole moments, which is also of great interest in display applications [5].…”

Section: Introductionmentioning

confidence: 99%

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Orientation and Solvatochromism of Dyes in Liquid Crystals

Pålsson¹,

Szablewski²,

Roberts³

et al. 2003

Molecular Crystals and Liquid Crystals

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Citation for published item: ¦ lssonD vF yF nd zlewskiD wrek nd oertsD eF nd wsutniD eF nd voveD qF hF nd grossD qF rF nd floorD hF nd uyD eF tF nd oolhouseD eF hF nd wsutniD eF nd sudD eF @PHHQA 9yrienttion nd solvtohromism of dyes in liquid rystlsF9D woleulr rystls nd liquid rystlsFD RHP @IAF ppF RQESQF Further information on publisher's website: httpXGGdxFdoiForgGIHFIHVHGURRVITTVS Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. The orientation and solvatochromism of some dye molecules in a liquid crystal have been investigated. Interactions with the host and the structure of the dye molecule affect the macroscopic alignment of dichroic dye molecules in a liquid crystal. It was observed that some dye molecules show a large bathochromic shift of their absorption maxima in the liquid crystal host relative to the situation in isotropic solvents. It is suggested that this is due to the occurrence of a much weaker reaction field in the anisotropic, rigid host. These dye molecules show little or no apparent order in the anisotropic host despite the observation of a reduction in the electro optic switching time when the dye is present. The highest degree of macroscopic alignment was observed for a merocyanine compound, which showed the smallest solvatochromic shift in the liquid crystal host. These results are discussed in terms of the steric, dipolar and hydrogen bond interactions between the guest and the host.

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Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Orientation and Solvatochromism of Dyes in Liquid Crystals

Pålsson¹,

Szablewski²,

Roberts³

et al. 2003

Molecular Crystals and Liquid Crystals

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“…Unlike other LC-based devices, PDLCbased devices are easily implemented as LC alignment layers and polarizers are not required. This electrically switchable scattering behavior of the PDLC structure is promising for a number of electro-optical applications such as projection displays [8], flexible displays [9], holographic optical elements [10], and smart windows [11]. The phase separation for PDLCs preparation can be induced by ultraviolet (UV) light [12], temperature [13], and solvents [14], with the most appropriate process depending on the prepolymer type and the polymerization mechanism.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Adhesion and Transmittance Uniformity in Laminated Polymer-Dispersed Liquid Crystal Films

Yoo¹,

Park²,

Park³

2014

Journal of the Optical Society of Korea

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We propose a two-step UV irradiation procedure to fabricate polymer-dispersed liquid crystal (PDLC) films by lamination. During the first UV treatment, before lamination, the UV-curable monomers coated on one film substrate are solidified through photo-polymerization as the phase separation between the liquid crystals and the monomers. Introducing an adhesion-enhancement layer on the other plastic substrate and controlling the UV irradiation conditions ensure that UV-induced cross-linkable functional groups remain on the surfaces of the photo-polymerized layers. Thereby, the adhesion stability between the top and bottom films is much improved during a second (post-lamination) UV treatment by further UV-induced cross-linking at the interface. Because the adhesion-enhancement and PDLC layers prepared by the bar-coating process are solidified before lamination, the PDLC droplet distribution and the cell gap between the two plastic substrates remain uniform under the lamination pressure. This ensures that the voltage-controlled light transmittance is uniform across the entire sample.

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“…Polymer network stabilized liquid crystals (PSLCs) have attracted increasing interest over the past decade because of their potential applications mainly in electro-optic devices such as displays and light shutters [1][2][3][4][5]. The main motivation to incorporate a polymer network in liquid crystal cells was to bulk-stabilize a desired director configuration against any mechanical shock and distortions which can irreversibly alter the functionality of the cells.…”

Section: Introductionmentioning

confidence: 99%

Atomic Force Microscopy Observations of the Polymer Network Structure Formed in Ferroelectric Liquid Crystals Cells

Petit¹

2012

Polymerization

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Polymer Dispersed Liquid Crystals for Display Application

Cited by 354 publications

References 14 publications

Orientation and Solvatochromism of Dyes in Liquid Crystals

Orientation and Solvatochromism of Dyes in Liquid Crystals

Enhanced Adhesion and Transmittance Uniformity in Laminated Polymer-Dispersed Liquid Crystal Films

Atomic Force Microscopy Observations of the Polymer Network Structure Formed in Ferroelectric Liquid Crystals Cells

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