Conformable displays based on polymer‐dispersed liquid‐crystal materials on flexible substrates

Cairns, Darran R.; Gorkhali, Suraj P.; Esmailzadeh, S.; Vedrine, J.; Crawford, G. P.

doi:10.1889/1.1825658

Cited by 20 publications

(10 citation statements)

References 33 publications

(38 reference statements)

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“…ITO is applied to substrates using sputter deposition, which makes it challenging to form a uniform film onto a curved surface. There has already been significant research into replacing ITO for use on devices mounted onto flexible substrates [61][62][63][64][65][66]. Some of these materials and techniques can be applied to wearable devices, such as contact lenses.…”

Section: Suitable Electrodes For Lc Contact Lensesmentioning

confidence: 99%

Switchable Liquid Crystal Contact Lenses for the Correction of Presbyopia

et al. 2018

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Abstract:Presbyopia is an age-related disorder where the lens of the eye hardens so that focusing on near objects becomes increasingly difficult. This complaint affects everyone over the age of 50. It is becoming progressively more relevant, as the average age of the global population continues to rise. Bifocal or varifocal spectacles are currently the best solution for those that require near and far vision correction. However, many people prefer not to wear spectacles and while multifocal contact lenses are available, they are not widely prescribed and can require significant adaptation by wearers. One possible solution is to use liquid crystal contact lenses that can change focal power by applying a small electric field across the device. However, the design of these contact lenses must be carefully considered as they must be comfortable for the user to wear and able to provide the required change in focal power (usually about +2D). Progress towards different lens designs, which includes lens geometry, liquid crystal choices and suitable alignment modes, are reviewed. Furthermore, we also discuss suitable electrode materials, possible power sources and suggest some methods for switching the lenses between near and far vision correction.

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Section: Suitable Electrodes For Lc Contact Lensesmentioning

confidence: 99%

Switchable Liquid Crystal Contact Lenses for the Correction of Presbyopia

et al. 2018

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“…They are not suitable for this acoustic application since ITO films will crack and thus lose conductivity under the continuous vibration needed for an actuator. Another transparent conductive material is poly (3, 4-ethylenedioxythiophene)-poly (4-stryrenesulfonate) (PEDOT:PSS) which has good flexibility [16]. However, its low transparency and low conductivity significantly limit its performance as electrodes [17], [18].…”

Section: A Transparent Conductive Thin Filmsmentioning

confidence: 99%

Active Control of Sound Transmission Through Windows With Carbon Nanotube-Based Transparent Actuators

Rajamani

Stelson

et al. 2007

IEEE Trans. Contr. Syst. Technol.

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This paper explores the development of active sound transmission control systems for windows that can achieve a significant reduction in window noise transmission. Two major challenges need to be addressed in order to make the development of such noise blocking windows feasible. These are the need for a distributed actuation system that is optically transparent and the unavailability of a real-time reference signal that can be used by the active control system to provide advance information on the noise affecting the window. To address the first challenge, a transparent thin-film actuator (speaker) is first developed for the control system, which consists of a piezoelectric poly (vinylidene fluoride) (PVDF) thin film coated with compliant carbon nanotube-based transparent conductors on both sides. The developed thin-film speaker shows excellent acoustic response over a broadband frequency range, and has the advantages of being flexible, transparent, thin, and lightweight. To address the second challenge of providing a time-advanced reference signal from a moving noise source, a small microphone array distributed on the outside wall of the home is used. New noise source identification algorithms are employed, by which an appropriate microphone from the array can be chosen to provide a reference signal. Experimental results show that over 12 dB reduction in sound transmission is achieved globally in the case of broadband sound, which demonstrates the effectiveness of the control system in blocking sound transmission.Index Terms-Active noise control (ANC), carbon nanotubes, noise source identification, sound transmission, transparent thin-film actuator, windows.

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“…To form a PDLC layer between two indium thin oxide (ITO)-coated plastic films, the favored approach is to print the LC/prepolymer mixture onto the first plastic substrate and then laminate with the second film [16,17]. This is preferable to conventional capillary filling of the LC/prepolymer mixture because a uniform LC/prepolymer ratio is more easily maintained, leading to uniform distributions of LC droplets and uniform light scattering behavior.…”

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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Conformable displays based on polymer‐dispersed liquid‐crystal materials on flexible substrates

Cited by 20 publications

References 33 publications

Switchable Liquid Crystal Contact Lenses for the Correction of Presbyopia

Switchable Liquid Crystal Contact Lenses for the Correction of Presbyopia

Active Control of Sound Transmission Through Windows With Carbon Nanotube-Based Transparent Actuators

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

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