Download or read book Diffractive Liquid Crystal Optical Elements for Near eye Displays written by Jianghao Xiong and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Liquid crystal planar optics (LCPO) with versatile functionalities is emerging as a promising candidate for overcoming various challenges in near-eye displays, like augmented reality (AR) and virtual reality (VR), while maintaining a small form factor. This type of novel optical element exhibits unique properties, such as high efficiency, large angular/spectral bandwidths, polarization selectivity, and dynamic modulation.

Download or read book Liquid Crystal Diffractive Optical Elements written by Manuel Bouvier and published by . This book was released on 2001 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Optics of Liquid Crystal Displays written by Pochi Yeh and published by John Wiley & Sons. This book was released on 2009-11-02 with total page 787 pages. Available in PDF, EPUB and Kindle. Book excerpt: NOW UPDATED—THE HIGHLY PRACTICAL GUIDE TO ANALYZING LIQUID CRYSTAL DISPLAYS The subject of liquid crystal displays has vigorously evolved into an exciting interdisciplinary field of research and development, involving optics, materials, and electronics. Updated to reflect recent advances, the Second Edition of Optics of Liquid Crystal Displays now offers a broader, more comprehensive discussion on the fundamentals of display systems and teaches readers how to analyze and design new components and subsystems for LCDs. New features of this edition include: Discussion of the dynamics of molecular reorientation Expanded information of the method of Poincaré sphere in various optical components, including achromatic wave plates and compensators Neutral and negative Biaxial thin films for compensators Circular polarizers and anti-reflection coatings The introduction of wide field-of-view wave plates and filters Comprehensive coverage of VA-LCD and IPS-LCD Additional numerical examples This updated edition is intended as a textbook for students in electrical engineering and applied physics, as well as a reference book for engineers and scientists working in the area of research and development of display technologies.

Download or read book Liquid Crystal Diffractive Optical Elements written by Xinghua Wang and published by . This book was released on 2005 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation is related to the fundamental physics of liquid crystal (LC) diffractive optical element (DOE) and its application in beam steering, wavefront control in large optics, electronic holography etc. Extensive computer modeling is performed to study the fundamental physics of LC DOE that involves advanced simulation method such as: Finite Difference Time Domain (FDTD) simulation, CODE V ray tracing and diffractive beam propagation, 2-D and 3-D liquid crystal director simulation etc. As a result, fringing electric field effect, defect formation, diffraction efficiency, polarization effect in a high resolution OPA is quantitatively studied. Many new device structure and concepts that can substantially improve the efficiency and diffraction angle of a LC DOE is proposed, for example, an optimized OPA, a pinned electrode OPA, a non-symmetrical variable period binary grating etc. FDTD simulation with both TE and TM mode is carried out, light propagation in LC DOE with complicated 3-D director distribution is studied. Experimental study is carried out to verify the modeling results constantly. 2-D birefringence measurement, electro-optical response of the device, as well as the diffraction efficiency, near field phase distribution, wavefront quality, far field beam profile is carried out to study the optical performance of the LC DOE. High resolution wavefront control system for large aperture telescope based on a LC DOE is demonstrated. Active laser beam control for multiple target tracking and acquisition is performed. Opto-electronic reconstruction of a digitally recorded hologram is also demonstrated with the best quality so far observed in this field.

Download or read book Liquid Crystal on Silicon Devices written by Andrés Márquez and published by MDPI. This book was released on 2019-11-19 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Liquid Crystal on Silicon (LCoS) has become one of the most widespread technologies for spatial light modulation in optics and photonics applications. These reflective microdisplays are composed of a high-performance silicon complementary metal oxide semiconductor (CMOS) backplane, which controls the light-modulating properties of the liquid crystal layer. State-of-the-art LCoS microdisplays may exhibit a very small pixel pitch (below 4 μm), a very large number of pixels (resolutions larger than 4K), and high fill factors (larger than 90%). They modulate illumination sources covering the UV, visible, and far IR. LCoS are used not only as displays but also as polarization, amplitude, and phase-only spatial light modulators, where they achieve full phase modulation. Due to their excellent modulating properties and high degree of flexibility, they are found in all sorts of spatial light modulation applications, such as in LCOS-based display systems for augmented and virtual reality, true holographic displays, digital holography, diffractive optical elements, superresolution optical systems, beam-steering devices, holographic optical traps, and quantum optical computing. In order to fulfil the requirements in this extensive range of applications, specific models and characterization techniques are proposed. These devices may exhibit a number of degradation effects such as interpixel cross-talk and fringing field, and time flicker, which may also depend on the analog or digital backplane of the corresponding LCoS device. The use of appropriate characterization and compensation techniques is then necessary.

Download or read book Liquid Crystal Optical Device written by Leszek R. Jaroszewicz and published by MDPI. This book was released on 2020-01-03 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Special Issue “Liquid Crystal Optical Devices” discusses recent developments in the rapidly advancing subject of liquid crystals (LCs). The book is composed of several contributions from researchers in the field of liquid crystals that deal with the broadly with aspects of optical devices ranging from a theoretical viewpoints to practical implications of the properties of LCs. This is the first Special Issue devoted solely to recent advances in the rapidly expanding subject of LCs, a unique class of substances that combines both ordered structures with quasi-liquid-like properties. This Special Issue offers a broad perspective of the present state of the art in design and an up-to-date account of the most recent advances and progress in the field of LCs, providing thorough coverage of the demonstrated optical devices and the comprehensive analysis needed by professionals and engineers in the field of LC. The material is carefully structured, providing readers with a solid foundation of the principles, capabilities, use, and limitations of LC optical devices. In addition, this book covers the principles, recent advances and future developments of liquid crystal beam steering devices as well as recent advances in adaptive liquid crystal lenses.

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 An Investigation of Liquid Crystal Devices Designed for Operation as Switchable Diffractive Optical Elements written by Ian Robert Mason and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Liquid Crystal on Silicon Devices Modeling and Advanced Spatial Light Modulation Applications written by Andrés Márquez and published by . This book was released on 2019 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Liquid Crystal on Silicon (LCoS) has become one of the most widespread technologies for spatial light modulation in optics and photonics applications. These reflective microdisplays are composed of a high-performance silicon complementary metal oxide semiconductor (CMOS) backplane, which controls the light-modulating properties of the liquid crystal layer. State-of-the-art LCoS microdisplays may exhibit a very small pixel pitch (below 4 ?m), a very large number of pixels (resolutions larger than 4K), and high fill factors (larger than 90%). They modulate illumination sources covering the UV, visible, and far IR. LCoS are used not only as displays but also as polarization, amplitude, and phase-only spatial light modulators, where they achieve full phase modulation. Due to their excellent modulating properties and high degree of flexibility, they are found in all sorts of spatial light modulation applications, such as in LCOS-based display systems for augmented and virtual reality, true holographic displays, digital holography, diffractive optical elements, superresolution optical systems, beam-steering devices, holographic optical traps, and quantum optical computing. In order to fulfil the requirements in this extensive range of applications, specific models and characterization techniques are proposed. These devices may exhibit a number of degradation effects such as interpixel cross-talk and fringing field, and time flicker, which may also depend on the analog or digital backplane of the corresponding LCoS device. The use of appropriate characterization and compensation techniques is then necessary.

Download or read book Characterization and Optimization of Liquid Crystal on Silicon Displays for Their Application to Diffractive Optics written by Angel Lizana Tutusaus and published by . This book was released on 2011 with total page 133 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Photoalignment of Liquid Crystalline Materials written by Vladimir G. Chigrinov and published by John Wiley & Sons. This book was released on 2008-09-15 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photoalignment possesses significant advantages in comparison with the usual ‘rubbing’ treatment of the substrates of liquid crystal display (LCD) cells as it is a non-contact method with a high resolution. A new technique recently pioneered by the authors of this book, namely the photo-induced diffusion reorientation of azodyes, does not involve any photochemical or structural transformations of the molecules. This results in photoaligning films which are robust and possess good aligning properties making them particularly suitable for the new generation of liquid crystal devices. Photoalignment of Liquid Crystalline Materials covers state-of-the-art techniques and key applications, as well as the authors’ own diffusion model for photoalignment. The book aims to stimulate new research and development in the field of liquid crystalline photoalignment and in so doing, enable the technology to be used in large scale LCD production. Key features: Provides a full examination of the mechanisms of photoalignment. Examines the properties of liquid crystals during photoalignment, with particular reference made to the effect on their chemical structure and stability. Considers the most useful photosensitive materials and preparation procedures suitable for liquid crystalline photoalignment. Presents several methods for photoalignment of liquid crystals. Compares various applications of photoalignment technology for in-cell patterned polarizers and phase retarders, transflective and micro displays, security and other liquid crystal devices. Through its interdisciplinary approach, this book is aimed at a wide range of practising electrical engineers, optical engineers, display technologists, materials scientists, physicists and chemists working on the development of liquid crystal devices. It will also appeal to researchers and graduate students taking courses on liquid crystals or display technologies. The Society for Information Display (SID) is an international society, which has the aim of encouraging the development of all aspects of the field of information display. Complementary to the aims of the society, the Wiley-SID series is intended to explain the latest developments in information display technology at a professional level. The broad scope of the series addresses all facets of information displays from technical aspects through systems and prototypes to standards and ergonomics

Download or read book Liquid Crystal Displays written by Birendra Bahadur and published by CRC Press. This book was released on 1984 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Phase Optimised General Error Diffusion for Diffractive Optical Component Design written by Jamie L. Ramsey and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Algorithms for developing Diffractive Optical Elements (DOEs) are improved to achieve real time holograms capable of switching at rates of 25frames/second or greater. A Phase Optimised General Error Diffusion (POGED) algorithm optimised for quality and speed of generation of diffractive elements is the main contribution of the research. Compared to Simulated Annealing algorithms, a fourfold improvement in the speed of generation is achieved. The algorithm is further enhanced to operate in the Fresnel region with high diffraction efficiency and Signal-to-Noise Ratio (SNR). A number of different target reconstructions are simulated to determine validity and performance of the algorithm. Diffractive optical elements are fabricated to verify performance and a free space optical beam steering application is defined to further validate a DOE generated by POGED. The performance of the diffractive optical elements is proven through the design and characterisation of a free space optical interconnect amenable to harnessing the fast switching speeds of liquid crystal spatial light modulators.

Download or read book Liquid Crystal Flat Optical Elements Enabled by Molecular Photopatterning with Plasmonic Metamasks written by Hao Yu (Writer on liquid crystals) and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spatially variant molecular orientations are central to the functionalities of various liquid crystal applications such as Pancharatnam lens, gratings, command of active matter, and programmable stimulus-responsive morphing of liquid crystal polymers. In this dissertation, I will present a photopatterning technique which allows for high resolution and high throughput patterning of arbitrary molecular orientations by using plasmonic metamasks. Unlike traditional photomasks, the plasmonic metamasks would generate structured light with spatially variant patterns of both intensity and polarization orientations. By projecting such structured light onto photoactive thin films of azo-dyes, orientation patterns can be imprinted in the azo-dyes and then transfer to the bulk of the liquid crystals. By using this photopatterning technique, transmissive/reflective liquid crystal lenses are designed and fabricated. Design principles and advantages of liquid crystal flat optical elements are detailed discussed.

Download or read book Diffractive and Holographic Device Technologies and Applications written by and published by . This book was released on 1997 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Liquid Crystal Devices Especially for Use in Liquid Crystal Point Diffraction Interferometer Systems written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Liquid crystal point diffraction interferometer (LCPDI) systems that can provide real-time, phase-shifting interferograms that are useful in the characterization of static optical properties (wavefront aberrations, lensing, or wedge) in optical elements or dynamic, time-resolved events (temperature fluctuations and gradients, motion) in physical systems use improved LCPDI cells that employ a "structured" substrate or substrates in which the structural features are produced by thin film deposition or photo resist processing to provide a diffractive element that is an integral part of the cell substrate(s). The LC material used in the device may be doped with a "contrast-compensated" mixture of positive and negative dichroic dyes.

Download or read book Diffractive Optical Elements written by D. K. Angell and published by . This book was released on 1990 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: The state-of-the-art of diffractive optical elements (DOEs) is reviewed in this report. Diffractive elements can be used with refractive elements or by themselves to enhance the overall system performance. Ray tracing programs available for design of DOEs are surveyed, and fabrication techniques and photosensitive recording materials are reviewed. Of the many applications, five sensor-related applications of DOEs are reviewed and summarized. These include diffractive lenses, head-up displays, eye-protection devices, scanners, and beam-forming optics. Keywords: Diffractive optical element, Holographic optical element, Kinoform, Diffractive, Grating, Lens. (jhd).