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  • 1. Rybalochka, A.
    et al.
    Sorokin, V.
    Valyukh, Sergiy
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Skarp, Kent
    Dalarna University, School of Technology and Business Studies, Material Science.
    Palmer, S.
    Selection of cholesteric liquid crystals for liquid crystal display with high multiplexing level1999In: Advanced display technologies, 1999Conference paper (Refereed)
  • 2.
    Valyukh, Iryna
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Arwin, Hans
    Chigrinov, Vladimir
    Valyukh, Sergiy
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Characterization of the photo-alignment material SD-1/SDA-2 with spectroscopic ellipsometry2007In: IDW '07: Proceedings of the 14th International Display Workshops, vols 1-3, 2007, Vol. 1-3, p. 391-394Conference paper (Refereed)
    Abstract [en]

    Variable angle spectroscopic ellipsometry (VASE) is applied for investigation of the azo-dye SD-1/SDA-2 which are used for photoalignment of liquid crystals. The azo-dye was spin coated on silicon substrates. Samples as prepared as well as samples illuminated with polarized UV light were studied. The measured optical constants were modelled with an ensemble of the Lorentz oscillators. The results confirm the reorientation mechanism of the photo-induced order formation in the azo-dye films under the action of polarized light, and also show that there exist some photochemical processes.

  • 3.
    Valyukh, Iryna
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Arwin, Hans
    Chigrinov, Vladimir
    Valyukh, Sergiy
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    UV-induced in-plane anisotropy in layers of mixture of the azo-dyes SD-1/SDA-2 characterized by spectroscopic ellipsometry2008In: Physica Status Solidi C - Current topics in solid state physics, vol.5, no.5, 2008, Vol. 5, no 5, p. 1274-1277Conference paper (Refereed)
    Abstract [en]

    The optical properties of the azo-dyes SD-1/SDA-2, which are used for photoaligning of liquid crystals (LCs), are investigated with Variable Angle Spectroscopic Ellipsometry (VASE). Films of mixture of SD-1/SDA-2 are deposited by spin coating on silicon wafers. The estimated thickness is approximately 10 nm. To achieve photo-induced anisotropy, one of the samples is illuminated during 15 minutes with linearly polarized UV light followed by thermal stabilization during 1 hour at 150 degrees C. VASE measurements are performed in the wavelength range 200-1350 rim at several angles of incidence and at different sample orientations. Dielectric functions of azo-dye films without/with polarized UV light illumination were modelled using an ensemble of Lorentz oscillators. The results confirm the diffusion model proposed recently for explanation of the formation of the photo-induced order in azo-dye films under the action of polarized light. Refractive indices, their wavelength dispersion and thicknesses of films of SD-1/SDA-2 are reported here.

  • 4.
    Valyukh, Iryna
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Valyukh, Sergiy
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Arwin, H.
    Chigrinov, V.
    Characteristic functions for uniformly twisted birefringent media2007In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 102, no 6, article id 063110Article in journal (Refereed)
    Abstract [en]

    We present two functions for characterization of birefringent media with application to twisted nematic liquid crystal (LC) cells in the field off state. The first function is for reflective LC cells and the second is for transmissive LC cells. Based on the Stockes formalism, it is shown that these functions describe the ability of a layer of the twisted birefringent medium to change polarization of the output light and are invariant to the layer orientation. The characteristic functions are found in simple procedures and can be used for simultaneous determination of retardation, its wavelength dispersion, and twist angle, as well as for solving optimization problems. © 2007 American Institute of Physics.

  • 5.
    Valyukh, Iryna
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Valyukh, Sergiy
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Skarp, Kent
    Chigrinov, V.
    Monochromatic bistable reflective and transfiective ferroelectric LCDs2005In: Proceedings of the 25th International Display Research Conference, Eurodisplay 2005, 2005, p. 305-308Conference paper (Refereed)
    Abstract [en]

    We study single and double polarizer monochromatic bistable reflective and transfective direct view ferroelectric liquid crystal displays (FLCDs). Three types of monochromatic displays are considered Black & White, Black & Yellow, Black & Green. Theoretical approach for finding optimal parameters of an FLCD is presented.

  • 6.
    Valyukh, Sergiy
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Adas, C.
    Franklin, G.
    Skarp, K.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Measuring parameters of liquid crystal cells with MePaLC system2005In: IDMC 2005: Proceedings of the International Display Manufacturing Conference, 2005, p. 795-798Conference paper (Refereed)
    Abstract [en]

    We present a sytem MePaLC for measuring retardation, its wavelength dispersion, twist angle, cell gap, and orientation of the input director. MePaLC enables us to measure practically all types of nematic liquid crystal cells: reflective and transmissive ones, with small and large cell gap.

  • 7.
    Valyukh, Sergiy
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Osterman, Jesper
    Dalarna University, School of Technology and Business Studies, Material Science.
    Adås, C.
    Skarp, Kent
    Dalarna University, School of Technology and Business Studies, Material Science.
    Cell gap measurements of flexible reflective TN- and STN-LC cells2004In: SID international symposium, 2004Conference paper (Refereed)
  • 8.
    Valyukh, Sergiy
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Osterman, Jesper
    Dalarna University, School of Technology and Business Studies, Material Science.
    Skarp, Kent
    Dalarna University, School of Technology and Business Studies, Material Science.
    Simple Spectroscopic Method to Measure Cell Gap and Twist Angle of TN-LCD2003In: International display research conference, 2003Conference paper (Refereed)
  • 9.
    Valyukh, Sergiy
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Osterman, Jesper
    Dalarna University, School of Technology and Business Studies, Material Science.
    Skarp, Kent
    Dalarna University, School of Technology and Business Studies, Material Science.
    Chigrinov, V.
    Optical performance of bistable reflective and transflective ferroelectric LCDs2005In: SID international symposium, Boston, 2005Conference paper (Refereed)
  • 10.
    Valyukh, Sergiy
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Osterman, Jesper
    Dalarna University, School of Technology and Business Studies, Material Science.
    Valyuhk, Iryna
    Dalarna University, School of Technology and Business Studies, Material Science.
    Skarp, Kent
    Dalarna University, School of Technology and Business Studies, Material Science.
    Characterization of flexible reflective liquid crystal cells2005In: Journal of the Society for Information Display, ISSN 1071-0922, E-ISSN 1938-3657, Vol. 13, no 6, p. 501-506Article in journal (Refereed)
    Abstract [en]

    We consider peculiarities in testing flexible reflective liquid-crystal (LC) cells. Several new methods for measuring optical retardation of filled reflective LC cells on plastic substrates are proposed. Cases when the plastic is anisotropic and the LC cell consists of either one or two internal polarizers are studied. The majority of proposed methods can be applied for transmissive LC cells as well as for measuring twist angle.

  • 11.
    Valyukh, Sergiy
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Rybalochka, A.
    Sorokin, V.
    Slobodyanyuk, A.
    Spectroscopic method to measure cellgap of TN LC cells2002In: Proc. of Eurodisplay 2002, NiceArticle in journal (Other academic)
  • 12.
    Valyukh, Sergiy
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Rybalochka, A.
    Sorokin, V.
    Tytarenko, P.
    Skarp, Kent
    Dalarna University, School of Technology and Business Studies, Material Science.
    A method for measuring reflective twist nematic liquid crystal cell properties2003In: Advanced display technologies, Moscow, Russia, 2003Conference paper (Refereed)
  • 13.
    Valyukh, Sergiy
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Rybalochka, A
    Sorokin, V
    Tytarnenko, T
    Skarp, Kent
    Dalarna University, School of Technology and Business Studies, Material Science.
    A method for measuring reflective twist nematic liquid crystal cell proporties2003In: Proceedings of XII International Symposium Advanced Display Technologies, Moscow, Russia, 2003, p. 254-257Conference paper (Refereed)
  • 14.
    Valyukh, Sergiy
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Slobodyanyuk, A.
    Sorokin, V.
    Skarp, Kent
    Dalarna University, School of Technology and Business Studies, Material Science.
    Computer simulation of scattering properties of cholesteric liquid crystal displays2001In: European conference on liquid crystals, Halle, Germany, 2001Conference paper (Other academic)
  • 15.
    Valyukh, Sergiy
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Valyuhk, Iryna
    Dalarna University, School of Technology and Business Studies, Material Science.
    Skarp, Kent
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Spectrophotometric determination of reflective liquid crystal cell parameters2006In: Journal of applied physiology, ISSN 8750-7587, E-ISSN 1522-1601, Vol. 99, no 5Article in journal (Refereed)
    Abstract [en]

    We introduce a method for the determination of the optical retardation, its wavelength dispersion, the cell twist angle, and the orientation of the input director in a reflective liquid crystal (LC) cell. These parameters are found from the extremes of a characteristic function defined as a sum of two spectral reflectivities of the LC cell placed between a pair of linear polarizers. The reflectivities are measured for two cell orientations, one of which is arbitrary and the other one is turned through 45°. Both theoretical analysis and experimental procedures are presented. Excellent agreement between the experiment and our theory has been found. The proposed method can be applied to the measurement of reflective LC cells with small and large cell gaps, as well as cells with small and large twist angles.

  • 16.
    Valyukh, Sergiy
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Valyukh, Iryna
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Adås, C.
    Chigrinov, V.
    Skarp, Kent
    Dalarna University, School of Technology and Business Studies, Material Science.
    Reflective liquid crystal cell parameters2004In: Asia display, 2004Conference paper (Refereed)
  • 17.
    Valyukh, Sergiy
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Valyukh, Iryna
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Xu, Peizhi
    Chigrinov, Vladimir
    Study on birefringent color generation for a reflective ferroelectric liquid crystal display2006In: Japanese Journal of Applied Physics, ISSN 0021-4922, E-ISSN 1347-4065, Vol. 45, no 10A, p. 7819-7826Article in journal (Refereed)
    Abstract [en]

    We study the possibility of a layer of a surface stabilized ferroelectric liquid crystal coupled with several retardation plates for birefringent color generation. Double and single polarizer reflective bistable dichromatic ferroelectric liquid crystal displays are considered. We demonstrate that one or two retardation plates are sufficient for a display having good color characteristics and high brightness. Optimal parameters for green/red and blue/yellow ferroelectric liquid crystal displays are found.

1 - 17 of 17
CiteExportLink to result list
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Cite
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  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • chicago-author-date
  • chicago-note-bibliography
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
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Output format
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  • text
  • asciidoc
  • rtf