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Optical Characterization and Optimization of Display Components [Elektronisk resurs] Some Applications to Liquid-Crystal-Based and Electrochromics-Based Devices

Valyukh, Iryna, 1972- (författare)
Granqvist, Claes-Göran (preses)
Wäckelgård, Ewa (preses)
Arwin, Hans, 1950- (preses)
Alternativt namn: Arwin, Hans R., 1950-
Hundery, Ola (opponent)
Högskolan Dalarna Akademin Industri och samhälle (utgivare)
Publicerad: Uppsala : Acta Universitatis Upsaliensis, 2009
Engelska 64
Serie: Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, 1651-6214
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  • E-bokAvhandling(Diss. (sammanfattning), 2009)
Sammanfattning Ämnesord
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  • This dissertation is focused on theoretical and experimental studies of optical properties of materials and multilayer structures composing liquid crystal displays (LCDs) and electrochromic (EC) devices. By applying spectroscopic ellipsometry, we have determined the optical constants of thin films of electrochromic tungsten oxide (WO x ) and nickel oxide (NiO y ), the films’ thickness and roughness. These films, which were obtained at spattering conditions possess high transmittance that is important for achieving good visibility and high contrast in an EC device. Another application of the general spectroscopic ellipsometry relates to the study of a photo-alignment layer of a mixture of azo-dyes SD-1 and SDA-2. We have found the optical constants of this mixture before and after illuminating it by polarized UV light. The results obtained confirm the diffusion model to explain the formation of the photo-induced order in azo-dye films. We have developed new techniques for fast characterization of twisted nematic LC cells in transmissive and reflective modes. Our techniques are based on the characteristics functions that we have introduced for determination of parameters of non-uniform birefringent media. These characteristic functions are found by simple procedures and can be utilised for simultaneous determination of retardation, its wavelength dispersion, and twist angle, as well as for solving associated optimization problems. Cholesteric LCD that possesses some unique properties, such as bistability and good selective scattering, however, has a disadvantage – relatively high driving voltage (tens of volts). The way we propose to reduce the driving voltage consists of applying a stack of thin (~1µm) LC layers. We have studied the ability of a layer of a surface stabilized ferroelectric liquid crystal coupled with several retardation plates for birefringent color generation. We have demonstrated that in order to accomplish good color characteristics and high brightness of the display, one or two retardation plates are sufficient. 

Ämnesord

Natural Sciences  (ssif)
Physical Sciences  (ssif)
Atom and Molecular Physics and Optics  (ssif)
Naturvetenskap  (ssif)
Fysik  (ssif)
Atom- och molekylfysik och optik  (ssif)
Natural Sciences  (ssif)
Physical Sciences  (ssif)
Atom and Molecular Physics and Optics  (ssif)
Naturvetenskap  (ssif)
Fysik  (ssif)
Atom- och molekylfysik och optik  (ssif)
Natural Sciences  (ssif)
Mathematics  (ssif)
Computational Mathematics  (ssif)
Naturvetenskap  (ssif)
Matematik  (ssif)
Beräkningsmatematik  (ssif)
NATURAL SCIENCES  (svep)
Physics  (svep)
Other physics  (svep)
Optics  (svep)
NATURVETENSKAP  (svep)
Fysik  (svep)
Övrig fysik  (svep)
Optik  (svep)
TECHNOLOGY  (svep)
Engineering physics  (svep)
Optical physics  (svep)
TEKNIKVETENSKAP  (svep)
Teknisk fysik  (svep)
Optisk fysik  (svep)
MATHEMATICS  (svep)
Applied mathematics  (svep)
Numerical analysis  (svep)
MATEMATIK  (svep)
Tillämpad matematik  (svep)
Numerisk analys  (svep)

Genre

government publication  (marcgt)

Indexterm och SAB-rubrik

ellipsometry
liquid crystal
LCD
optical anizotropy
electrochromic
inverse problems
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