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Orthoconic antiferroelectric liquid crystals, whose half cone angle is 45°, are of interest in display technology because they are capable of providing greyscale in passively addressing waveform while exhibiting very good contrast. However, orthoconic antiferroelectrics having short pitch are difficult to be aligned, this makes surface stabilized alignment unfeasible. In this case, dynamic behaviour is usually poor, avoiding electronic addressing with standard electronics. In this work, we report the helical pitch measurements of OAFLC mixtures and we compare electrooptical performance of high and low pitch OAFLCs.
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Czasopismo
Rocznik
Tom
Strony
71--75
Opis fizyczny
Bibliogr. 14 poz., wykr.
Twórcy
autor
autor
autor
autor
autor
autor
- Dpto. Tecnología Fotónica, Universidad Politécnica de Madrid, Ciudad Universitaria s/n, E-28040 Madrid, Spain, n_bennis@tfo.upm.es
Bibliografia
- [1] J. M. Oton, X. Quintana, P. L. Castillo, A. Lara, V. Urruchi, and N. Bennis: Antiferroelectric liquid crystal displays. Opto-Electron. Rev. 12, 236-269, 2004.
- [2] R. Beccherelli and S. J. Elston: Evaluation of optical anisotropy in the pretransitional regime in antiferroelectric liquid crystals. Liq. Cryst. 25, 573-577, 1998.
- [3] S. Lagerwall, A. Dahlgren, P. Jagemalm, P. Rudquist, K. D'have, H. Pauwels, R. Dąbrowski, and W. Drzewiński: Unique electro-optical properties of liquid crystals designed for molecular optics. Adv. Funct. Mater. 11, 87-94, 2001.
- [4] M. J. O'Callaghan and M. A. Handschy: Diffractive ferroelectric liquid-crystal shutters for unpolarized light. Opt. Lett. 16, 770-772, 1991.
- [5] S. T. War and R. J. Mears: Polarisation insensitive operation of FLC devices. Electron. Lett. 31, 714-716, 1995.
- [6] C. V. Brown and E. E. Kriezis: Calculation of the efficiency of polarization-insensitive surface-stabilized ferroelectric liquid crystal diffraction gratings. Appl. Opt. 42, 2257-2263, 2003.
- [7] C. V. Brown and E. E. Kriezis: Surface-stabilized ferroelectric liquid-crystal diffraction gratings with micrometer-scale pitches. Appl. Opt. 43, 5287-5294, 2004.
- [8] Tee Cath, W. A. Crossland, T. D. Wilkinson, and A. A. Davey: Binary phase modulation using electrically addressed transmissive and silicon backplane spatial light modulators. Opt. Eng. 39, 2527-2534, 2000.
- [9] D. Engström, M.J. O'Callaghan, C. Walker, and M. A. Handschy: Fast beam steering with a ferroelectric-liquid-crystal optical phased array. Appl. Opt. 48, 1721-1726, 2009.
- [10] W. A. Crossland, I. G. Manolis, M. M. Redmond, K. L. Tan, T. D. Wilkinson, A. Chu, M. J. Holmes, T. Parker, I. G. Bonas, B. Robertson, S. T. Warr, C. Stace, H. J. White, R. A. Woolley, and G. Henshall: Beam steering optical switches using LCOS: The 'Roses' demonstrator. IEEE/LEOS Summer Topical Meeting, Electronics Enhanced Optics, Miami, FL, USA, 29-30, 2000.
- [11] J. S. Patel and J. W. Goodby: Alignment of liquid crystals which exhibit cholesteric to smectic C* phase transitions. J. Appl. Phys. 59, 2355-2360, 1986.
- [12] W. Rejmer, M. Żurowska, R. Dąbrowski, K. Czupryński, Z. Raszewski, and W. Piecek: An influence of the fluorosubstitution and the spacer length on the phase transitions and helical pitch value in high tilted antiferroelectric esters. Mol. Cryst. Liq. Cryst. 509, 937-947, 2009.
- [13] M. Żurowska, R. Dąbrowski, J. Dziaduszek, K. Skrzypek, M. Filipowicz, W. Rejmer, K. Czupryński, N. Bennis, and J. M. Otón: Influence of alkoxy spacer length and fluorosubstitution of benzene ring on mesogenic and spectral properties of high tilted antiferroelectric 4'-(S)-1-(methylheptyloxycarbonyl)biphenyl-4-yl-4-(2,2,3,3,4,4,4-heptafluorobutoxy)alkoxy-benzoates. J. Mater. Sci. (in press).
- [14] X. Quintana, J. L. Gayo, C. Rodrigo, V. Urruchi, and J. M. Otón: Addressing waveforms for tristable AFLCs in active matrix displays. Ferroelectrics 246, 211, 2000.
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Bibliografia
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bwmeta1.element.baztech-article-BWAD-0020-0012