Atterwill / Chigrinov / Kozenkov Photoalignment of Liquid Crystalline Materials

Physics and Applications
1. Auflage 2008
ISBN: 978-0-470-75179-4
Verlag: John Wiley & Sons
Format: PDF
Kopierschutz: Adobe DRM (»Systemvoraussetzungen)

E-Book, Englisch, 248 Seiten, E-Book

Reihe: Wiley Series in Display Technology

Photoalignment possesses significant advantages in comparison withthe usual 'rubbing' treatment of the substrates ofliquid crystal display (LCD) cells as it is a non-contact methodwith a high resolution. A new technique recently pioneered by theauthors of this book, namely the photo-induced diffusionreorientation of azodyes, does not involve any photochemical orstructural transformations of the molecules. This results inphotoaligning films which are robust and possess good aligningproperties making them particularly suitable for the new generationof liquid crystal devices.
Photoalignment of Liquid Crystalline Materials coversstate-of-the-art techniques and key applications, as well as theauthors' own diffusion model for photoalignment. Thebook aims to stimulate new research and development in the field ofliquid crystalline photoalignment and in so doing, enable thetechnology to be used in large scale LCD production.
Key features:
* Provides a full examination of the mechanisms ofphotoalignment.
* Examines the properties of liquid crystals duringphotoalignment, with particular reference made to the effect ontheir chemical structure and stability.
* Considers the most useful photosensitive materials andpreparation procedures suitable for liquid crystallinephotoalignment.
* Presents several methods for photoalignment of liquidcrystals.
* Compares various applications of photoalignment technology forin-cell patterned polarizers and phase retarders, transflective andmicro displays, security and other liquid crystal devices.
Through its interdisciplinary approach, this book is aimed at awide range of practising electrical engineers, optical engineers,display technologists, materials scientists, physicists andchemists working on the development of liquid crystal devices. Itwill also appeal to researchers and graduate students takingcourses on liquid crystals or display technologies.
The Society for Information Display (SID) is an internationalsociety, which has the aim of encouraging the development of allaspects of the field of information display. Complementary to theaims of the society, the Wiley-SID series is intended to explainthe latest developments in information display technology at aprofessional level. The broad scope of the series addresses allfacets of information displays from technical aspects throughsystems and prototypes to standards and ergonomics

Autoren/Hrsg.

Chigrinov, Vladimir G.

Kozenkov, Vladimir M.

Kwok, Hoi-Sing

Inhaltsverzeichnis

About the Authors.
Series Editor's Foreword.
1. Introduction.
References.
2. Mechanisms of LC Photoalignment.
2.1 Cis-Trans Isomerization.
2.2 Pure Reorientation of the Azo-Dye ChromophoreMolecules or Azo-Dye Molecular Solvates.
2.3 Crosslinking in Cinnamoyl Side-Chain Polymers.
2.4 Photodegradation in Polymide Materials.
2.5 Photoinduced Order in Langmuir-Blodgett Films.
References.
3. LC-Surface Interaction in a Photoaligned Cell.
3.1 Pretilt Angle Generation in Photoaligning Materials.
3.2 Generation of Large Pretilt Angles.
3.3 Anchoring Energy in Photoaligning Materials.
3.4 Stability of Photoaligning Materials Sensitivity to UVLight.
3.5 Comparison of the Characteristics of Photoalignment Layersfor Different Mechanisms of LC Photoalignment.
3.6 Various Methods for the Experimental Characterization ofPhotoalignment Layers.
References.
4. Photoalignment of LCs.
4.1 Vertical LC Alignment.
4.2 Twisted LC Photoalignment.
4.3 Photoalignment of Ferroelectric LC.
4.4 Optical Rewritable LC Alignment.
4.5 Photoalignment with Asymmetric Surface Anchoring.
4.6 LC Photoalignment on Plastic Substrates.
4.7 Photoalignment on Grating Surface.
4.8 Photoalignment of Lyotropic and Discotic LCs.
4.9 Other Types of LC Photoalignment.
References.
5. Application of Photoalignment Materials in OpticalElements.
5.1 Polarizers.
5.2 Retardation Films.
5.3 Transflective LCD with Photo-Patterned Polarizers and PhaseRetarders.
5.4 Security Applications of Photoaligning andPhoto-Patterning.
5.5 Optical Elements Based on Photoaligning Technology.
References.
6. Novel LCDs Based on Photoalignment.
6.1 Bistable Nematic Displays.
6.2 Photoaligned Liquid-Crystal-on-Silicon Microdisplays.
6.3 Photoaligned Ferroelectric LCDs.
6.4 New Optical Rewritable Electronic Paper.
6.5 Application of Photoalignment in Photonic LC Devices.
References.
7. US Patents Related to Photoalignment of LiquidCrystals.
7.1 Introductory Remarks.
7.2 List of Patents Patent Classification.
7.3 Analysis and Comments on the Patents.
Index.

Über Autor(innen)

Vladimir G. Chigrinov obtained his PhD degree in solid-statephysics from the Shubnikov Institute of Crystallography, USSRAcademy of Sciences, in 1978. In 1988, he defended his doctoraldegree and became a professor at the Shubnikov Institute ofCrystallography, where he was a leading researcher from 1996. Hejoined HKUST in 1999 and is currently an associate professor. Since1974 Professor Chigrinov has published 2 books. 15 reviews and bookchapters, about 150 journal papers, more than 300 conferencepresentations, and holds more than 50 patents and patentapplications in the field of liquid crystals. He is a Senior SIDMember, SID Fellow and an Associate Editor of the Journal of theSociety for Information Display.
Vladimir M. Kozenkov graduated from the Moscow EnergeticInstitute as a scientist in applied physical optics (laserdepartment). For 30 years he worked at the Organic Intermediatesand Dyes Institute (NIOPIK) in Moscow. He pioneered research anddevelopment of various organic photosensitive materials forholography, waveguide, integral and polarization optics,stereolithography, optical memory, imaging processing, and securityapplications. He was the first to discover the phenomenon ofphotoinduced birefringence in polyvinyl-cinnamate films in 1977. Hehas published more than 100 refereed papers and holds more than 50patents.
Hoi-Sing Kwok obtained his PhD degree in applied physicsfrom Harvard University in 1978. He joined the State University ofNew York at Buffalo in 1980 and became a full professor in 1985. Hejoined HKUST in 1992 an is currently Director of the Center forDisplay Research (www.cdr.ust.hk). Professor Kwokhas written over 500 refereed publications and holds 40 patents inlaser optics and LCD technologies. He is a Fellow of the OSA, theIEEE, and the SID.