Download or read book New Electro optic Effects Using Chiral Nematic Liquid Crystals written by Jing Chen and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The New Electro optic Effects for Chiral Nematic Liquid Crystals written by J. Chen and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Linear Electro optic Effect in a Chiral Nematic Liquid Crystal written by Per Rudquist and published by . This book was released on 1993 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electrooptic Effects in Liquid Crystal Materials written by L.M. Blinov and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 477 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electrooptic effects provide the basis for much liquid-crystal display technology. This book, by two of the leaders in liquid-crystal research in Russia, presents a complete and accessible treatment of virtually all known phenomena occurring in liquid crystals under the influence of electric fields.
Download or read book Electro optic studies of the flexoelectric effect in chiral nematic liquid crystals written by Bronje Musgrave and published by . This book was released on 2000 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electro optical and Flexoelectro optical Properties Enhanced by Bimesogen doped Chiral Nematic Liquid Crystals written by Vinay Joshi and published by . This book was released on 2018 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt: The recent discovery of high-temperature mesophase, also known as the twist-bend nematic phase in liquid crystal dimers (or bimesogens) has triggered interest due to its unique structure-property relationship. Bimesogens consisting of two mesogenic units separated by odd-membered flexible alkyl chain possess a bent molecular formation which results in a low bend elastic constant (K3) and also facilitates flexoelectro-optic response that can be exploited for innovative technological development in the field of displays and other electro-optic devices. In this dissertation, the dynamics of bimesogen-doped chiral nematic liquid crystal (N*LC) during is studied to understand the influence of low K3 as the rod-like LCs undergo Freedericksz transition from bend to splay. The tilt degeneracy in LCs occurring during bend-to-splay deformation of N*LCs switch, the effect is manifested as the optical bounce in the dynamic electro-optic response. The bimesogens, having short flexible spacers tend to enhance the optical bounce in N*LCs and results in a long response time for homeotropic-twist transition. To enable a fast response time, N*LCs are polymer stabilized with surface-localized protrusions that lowers the backflow during electro-optic response and thereby suppresses the optical bounce by 78% and reduces the response time by >90%. In the second part, to further explore the omnipresent property of bimesogenic nematic materials, a fast flexoelectro-optic response in bimesogen-doped N*LCs with an out-of-plane swing in vertical standing helix was proposed and systematic studied with a series of bimesogens reveal the correlation between the flexoelectrically-driven swinging amplitude of the helices in N*LCs and the flexible spacer length in the bimesogens. The giant flexoelectrically-switched tilt leads to a helix-tilt angle up to 53℗ʻ. The experimentally measured maximum flexoelastic ratio (e/K) of polymer stabilized N*LCs was 2.758 CN-1m-1. Moreover, the LC device exhibits sub-millisecond response time (0.43 ms), low electric-field ramping hysteresis and high optical contrast (500:1) between field-on and field-off state. These observations are of considerable scientific and technological importance and will open up new forays into field-sequential-color devices that provide an energy-efficient solution to current color-filter-based display technology.In the third part, a wide spectra color-reflective device based on polymer-sustained conical helix (PSCH) is explored and demonstrated. Apart from the selective reflection of light, the device also demonstrates light-scattering focal conic texture in off-state and transparent homeotropic state at a high electric field. The memory effect produced by a granular polymer network not only mirrors the conical helix but also facilitates a long-range pitch modulation in a cholesteric during the increasing and decreasing of the electric field. A wide color gamut with high spectral purity and uniform structural colors across the entire electrode area is achieved with the PSCH.The last part of dissertation describes the development of a multiplanar volumetric 3D device with time-multiplexed series of 2-D images using a sequential switching stack of reverse-mode polymer stabilized cholesteric texture (R-PSCT) films and digitally synchronized with 2-D image projection. R-PSCT films tend to lose optical clarity in off-state after few switching cycles due to deformation in the polymer network. To investigate the electro-mechanical characteristics of R-PSCT, a systematic study is performed by varying the concentrations of two different reactive mesogens: RM6 and RM257. The optimum composition of reactive monomer for R-PSCT was found to be 80% RM6+20% RM6 that yields the optical contrast of ~ 7, turn-on time 1.1 ms, turn-off time 1.8 ms and wide viewing angle with a cone of 120℗ʻ.
Download or read book Augmenting Electro Optic and Optical Behavior of Cholesteric and Nematic Liquid Crystals written by Andrii Varanytsia and published by . This book was released on 2018 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Commending topological defects of liquid crystals (LCs) facilitates many configurational simulations and experimental manipulations of active soft matter for electro-optical (EO), optical and photonic applications. In this dissertation, investigation of topological defects in cholesteric liquid crystals (CLCs) enables better visualizing and control unique self-assembly, dielectric and optical properties of CLCs and leads to the development of a fast switching active retarder film based on a CLC with uniform lying helix (ULH) texture, a bistable light diffractive CLC films based on metastable bubble domain (BD) texture, and an in-plane-switching (IPS) LC device based on two-dimensional graphene electrode.We first demonstrate a giant flexoelectro-optic effect (FOE) in a CLC with ULH texture. The electric-field-induced helical axis (HA) rotation of a ULH structure due to flexoelectric coupling is accomplished by the surface-localized polymer network stabilization. A 40 times enhancement in flexoelastic coefficient compared to a conventional CLC materials is achieved by using the CLC based on CB7CB bimesogen. The giant FOE of a polymer-stabilized ULH (PS-ULH) enables the development of an active retarder having high optical contrast and sub-millisecond response time.The second part of dissertation is to investigate topology-mediated optical and electro-optical properties of CLCs with BD texture (CLC-BD) providing unique bistability between the light transmission and light scattering states. The CLC-BD device requires electric field only during switching between transparent and opaque states creating great potential applications as active diffusers and smart windows. An opto-mechanical modulation is demonstrated with a light-sensitive chiral azo-benzene dye doping in a CLC-BD device. To close, the augmentation of EO behavior in a nematic IPS device with graphene transparent electrode is demonstrated. We command the EO switching on photo-lithographically-patterned graphene electrode with a highly-effective non-contact LC photoalignment method to maximize the field-driven optical contrast of a prototyped device. Our experiments provide a solution for technical challenges related to processing and handling of two-dimensional graphene on rigid and flexible substrates and facilitate the applications of graphene for devices with complex and high-definition electrode patterns.
Download or read book Selected Papers on Liquid Crystals for Optics written by Stephen D. Jacobs and published by . This book was released on 1992 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Flexoelectricity in Liquid Crystals written by Agnes Buka and published by World Scientific. This book was released on 2013 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book intends to give a state-of-the-art overview of flexoelectricity, a linear physical coupling between mechanical (orientational) deformations and electric polarization, which is specific to systems with orientational order, such as liquid crystals. Chapters written by experts in the field shed light on theoretical as well as experimental aspects of research carried out since the discovery of flexoelectricity. Besides a common macroscopic (continuum) description the microscopic theory of flexoelectricity is also addressed. Electro-optic effects due to or modified by flexoelectricity as well as various (direct and indirect) measurement methods are discussed. Special emphasis is given to the role of flexoelectricity in pattern-forming instabilities. While the main focus of the book lies in flexoelectricity in nematic liquid crystals, peculiarities of other mesophases (bent-core systems, cholesterics, and smectics) are also reviewed. Flexoelectricity has relevance to biological (living) systems and can also offer possibilities for technical applications. The basics of these two interdisciplinary fields are also summarized.
Download or read book Chirality in Liquid Crystals written by Heinz Kitzerow and published by Springer Science & Business Media. This book was released on 2006-04-28 with total page 513 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes the main aspects of chirality in liquid crystals, and points out some of the open questions of current research. The chapters review the highlights of the important topics and questions.
Download or read book Liquid Crystal Displays written by Ernst Lueder and published by Wiley-Blackwell. This book was released on 2001 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: The special feature of the book is the in depth treatment of both the electro-optic effects and the addressing schemes of liquid crystal displays elucidating their interdependence. After basic explanations readily understandable for students and stimulating for engineers, physicists and chemists, the reader is gradually led to the latest developments such as vertically aligned and mixed mode TN-displays, compensation foils, multiple line and low power addressing, transistor driven LCOS-devices with DRAM and SRAM addressing and TFT-addressing of transmissive displays with a 92% aperture ratio. The results are analytically derived and not merely stated to enhance insight and the capability to tailor displays to individual needs or to perform novel designs. Towards this aim the propagation of light with the help of Jones vectors, four different characterizations of the state of polarization and the operation as well as the passive and active matrix addressing of all LCDs, like nematic, polymer dispersed, guest host and bistable devices is explained. Besides the mainstream twisted and supertwisted nematic LCDs attention is drawn to bistable ferroelectric, chiral nematic and modified nematic LCDs as they are most promising for future portable low power systems. Tables on display formats and units for the measurement of displays finally render the book suitable as a reference for experts working in the field and as a textbook for universities or display courses. The forefront of research is reached by the treatment of plastic substrates, the replacement of vacuum processes by less expensive printing and low temperature fabrication of a-Si- and poly-Si-TFTS.
Download or read book Structure and Properties of Liquid Crystals written by Lev M. Blinov and published by Springer Science & Business Media. This book was released on 2010-10-26 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book by Lev M. Blinov is ideal to guide researchers from their very first encounter with liquid crystals to the level where they can perform independent experiments on liquid crystals with a thorough understanding of their behaviour also in relation to the theoretical framework. Liquid crystals can be found everywhere around us. They are used in virtually every display device, whether it is for domestic appliances of for specialized technological instruments. Their finely tunable optical properties make them suitable also for thermo-sensing and laser technologies. There are many monographs written by prominent scholars on the subject of liquid crystals. The majority of them presents the subject in great depth, sometimes focusing on a particular research aspect, and in general they require a significant level of prior knowledge. In contrast, this books aims at an audience of advanced undergraduate and graduate students in physics, chemistry and materials science. The book consists of three parts: the first part, on structure, starts from the fundamental principles underlying the structure of liquid crystals, their rich phase behaviour and the methods used to study them; the second part, on physical properties, emphasizes the influence of anisotropy on all aspects of liquid crystals behaviour; the third, focuses on electro-optics, the most important properties from the applications standpoint. This part covers only the main effects and illustrates the underlying principles in greater detail. Professor Lev M. Blinov has had a long carrier as an experimentalist. He made major contributions in the field of ferroelectric mesophases. In 1985 he received the USSR state prize for investigations of electro-optical effects in liquid crystals for spatial light modulators. In 1999 he was awarded the Frederiks medal of the Soviet Liquid Crystal Society and in 2000 he was honoured with the G. Gray silver medal of the British Liquid Crystal Society. He has held many visiting academic positions in universities and laboratories across Europe and in Japan.
Download or read book Physical Properties of Liquid Crystals written by George W. Gray and published by John Wiley & Sons. This book was released on 2009-08-14 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook is a unique compendium of knowledge on all aspects of the physics of liquid crystals. In over 500 pages it provides detailed information on the physical properties of liquid crystals as well as the recent theories and results on phase transitions, defects and textures of different types of liquid crystals. An in-depth understanding of the physical fundamentals is a prerequisite for everyone working in the field of liquid crystal research. With this book the experts as well as graduate students entering the field get all the information they need.
Download or read book Liquid Crystal Dispersions written by Paul S. Drzaic and published by World Scientific. This book was released on 1995 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymer-dispersed liquid crystal (PDLC) materials are of interest both for their potential in display technology and the fascinating science found in liquid crystals confined to small cavities. Liquid Crystal Dispersions is a comprehensive overview of the science and technology of this new class of materials. Topics covered include formation of PDLC devices, a catalog of droplet structures and transformations, device electro-optical properties, and applications. Liquid Crystal Dispersions will be of value to the nonspecialists keen on gaining an overview of this new field, as well as to specialists interested in a comprehensive review of work in this area.
Download or read book Electro optic Effects in Chiral Smectic Liquid Crystals written by Gunnar Andersson and published by . This book was released on 1992 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Liquid Crystals In Complex Geometries written by G P Crawford and published by CRC Press. This book was released on 1996-04-29 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: Focusing on the applied and basic aspects of confined liquid crystals, this book provides a current treatise of the subject matter and places it in the broader context of electrooptic applications. The book takes an interdisciplinary approach to the
Download or read book Fundamentals of Liquid Crystal Devices written by Deng-Ke Yang and published by John Wiley & Sons. This book was released on 2014-12-03 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt: Liquid Crystal Devices are crucial and ubiquitous components of an ever-increasing number of technologies. They are used in everything from cellular phones, eBook readers, GPS devices, computer monitors and automotive displays to projectors and TVs, to name but a few. This second edition continues to serve as an introductory guide to the fundamental properties of liquid crystals and their technical application, while explicating the recent advancements within LCD technology. This edition includes important new chapters on blue-phase display technology, advancements in LCD research significantly contributed to by the authors themselves. This title is of particular interest to engineers and researchers involved in display technology and graduate students involved in display technology research. Key features: Updated throughout to reflect the latest technical state-of-the-art in LCD research and development, including new chapters and material on topics such as the properties of blue-phase liquid crystal displays and 3D liquid crystal displays; Explains the link between the fundamental scientific principles behind liquid crystal technology and their application to photonic devices and displays, providing a thorough understanding of the physics, optics, electro-optics and material aspects of Liquid Crystal Devices; Revised material reflecting developments in LCD technology, including updates on optical modelling methods, transmissive LCDs and tunable liquid crystal photonic devices; Chapters conclude with detailed homework problems to further cement an understanding of the topic.
