Electro-optic response of polymer dispersed liquid-crystal films

Jain, S. C.; Rout, D. K.

doi:10.1063/1.349828

Cited by 119 publications

(41 citation statements)

References 7 publications

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“…Fuh et al investigated PDLC lms based on E7 / EPO305 and found that a plot of transmission polymer refractive indices, etc. [11][12][13][14][15]. Interfacial eOE ects are also important due to the increased surface-to-volum e as a function of temperature showed broad peaks [18].…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of electro-optical characteristics of polymer dispersed liquid crystal films

Han¹

2001

Liquid Crystals

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Polymer dispersed liquid crystal (PDLC) lms consist of microdroplets of a liquid crystal dispersed in a polymer matrix. Their applications are based on the electrically controllable light scattering properties of the liquid crystal droplets. The eOE ects of temperature on the electro-optical properties of PDLC lms have been rarely investigated. In this work, we studied the light transmission on varying the temperature and frequency. It was observed that the transmission at a xed voltage decreased with increasing temperature above 43ß C, independent of frequency. We examined possible origins of this unusual dependence of the transmission on the temperature. It was concluded that conductivity eOE ects due to free ions newly created at high temperatures could be responsible for the unusual behaviour observed.

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Section: Introductionmentioning

confidence: 99%

Temperature dependence of electro-optical characteristics of polymer dispersed liquid crystal films

Han¹

2001

Liquid Crystals

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“…In spite of decreased droplet size, rise time slightly decreases with increasing content of surfactant due to the decreased anchoring energy. Decay time significantly increases with increasing voltage due to the greater distortion of the director and in turn a greater restoration energy [38] under high applied field. It was also found that decay time decreases with increasing content of surfactant, mainly due to the small droplet size.…”

Section: Electro-optical Propertiesmentioning

confidence: 98%

Surfactant Effects on Morphology and Switching of Holographic PDLCs Based on Polyurethane Acrylates

Woo

Kim

2006

ChemPhysChem

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Effects of octanoic acid (OA) on the morphology, diffraction efficiency, and electro-optic properties of the transmission mode of holographic polymer-dispersed liquid crystals (HPDLC) are studied. Droplet size decreases with increasing OA content (0-9 %), and this leads to a monotonic increase in off-state diffraction with increasing OA content. However, on-state diffraction decreases with increasing applied voltage and shows a minimum at 6 % OA, for which minimum switching voltage (5 V microm(-1)) and maximum contrast ratio (10) are obtained. Rise time and decay time decrease with increasing OA content. Interposition of OA between polymer and LC droplet is theoretically predicted by the spreading coefficient (lambda>0) calculated on the basis of the solubility parameter, while the coalescence behavior of droplets is described by a dimensionless group (gamma d rho / mu(2)) called coalescence number.

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“…However, the interaction between the electric field and the liquid crystal competes with the interfacial energy between the liquid crystal and the polymer wall of the droplet [22,23] . Decreasing R causes an increase in the surface anchoring energy of the LC, thus more voltage is needed to switch the LC.…”

Section: Electro-optic Characteristicsmentioning

confidence: 98%

The surface rubbing effect on morphologies of LC droplets and electro-optic properties of flexible PDLC films

Liu

Du-ling

Yang

et al. 2009

Sci. China Ser. B-Chem.

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The flexible polymer dispersed liquid crystal (PDLC) film with threshold voltage V 10 and saturation driving voltage V 90 as low as 0.34 V/μm and 0.77 V/μm, respectively, has been prepared successfully by polymerization induced phase separation (PIPS). The surface rubbing effect on morphologies of liquid crystals (LC) droplets and electro-optic properties of PDLC films has been studied experimentally and theoretically. We use a CVC (Color Video Camera) and a SEM (Scan Electron Microscope) to detect and characterize morphologies of LC droplets in the net of polymer. The result reveals that almost all the smaller LC droplets exhibit in the rubbing direction uniformly, and the texture of PDLC is similar to that of H-PDLC. Meanwhile, compared with the sample of the non-rubbing disposal, the response time declines evidently by 11.2 ms (i.e., the rising time τ rise ) and 27.2 ms (i.e., the decaying time τ down ), and the contrast ratio is improved from 18.5 to 35.9. Such a result can be attributed to the surface rubbing effect.polymer dispersed liquid crystal (PDLC), surface rubbing effect, morphologies, threshold voltage

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Electro-optic response of polymer dispersed liquid-crystal films

Cited by 119 publications

References 7 publications

Temperature dependence of electro-optical characteristics of polymer dispersed liquid crystal films

Temperature dependence of electro-optical characteristics of polymer dispersed liquid crystal films

Surfactant Effects on Morphology and Switching of Holographic PDLCs Based on Polyurethane Acrylates

The surface rubbing effect on morphologies of LC droplets and electro-optic properties of flexible PDLC films

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