Modifying electrooptics of orthoconic antiferroelectric liquid crystal cells by manufacturing procedures

• Autorzy: Spadło A. , Bennis N. , Dąbrowski R. , Quintana X. , Otón J. M. , Geday M. A.
• Konferencja: International Workshop on Liquid Crystals for Photonics ; (26-28.04.2006 ; Gent, Belgium)
• Języki publikacji: EN

Abstrakty

EN

Orthoconic antiferroelectric liquid crystals (AFLCs) having 45° tilt angle have been proposed to overcome the problem of reduced contrast usually exhibited by regular antifrerroelectric displays. However, the pitch of the helix induced by chrality is customarily short in existing orthoconic materials, making it difficult to achieve surface stabilized configurations when the material's pitch is amaller than the cell thickness.In this work, the influence of different manufacturing procedures on the electrooptical behaviour of orthoconic AFLCs is studied. Using the same arthoconic AFLC mixture, aligning surfaces and manufacturing protocol, we have observed two dissimilar responses, true orthoconic behaviour; and orthoconic V-shape response. The electrooptical response depends ultimately on the rubbing strategy adopted in either case.

Słowa kluczowe

EN

orthoconic AFLC; electrooptical response; manufacturing; rubbing

• Wydawca: Stowarzyszenie Elektryków Polskich ; Polska Akademia Nauk ; Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
• Czasopismo: Opto-Electronics Review
• Rocznik: 2007
• Tom: Vol. 15, No. 1
• Strony: 60--65
• Opis fizyczny: Bibliogr. 21 poz., wykr.

Twórcy

autor

Spadło A.

autor

Bennis N.

autor

Dąbrowski R.

autor

Quintana X.

autor

Otón J. M.

autor

Geday M. A.

• Military University of Technology, 2 Kaliskiego Str., 00-908 Warsaw, Poland

Bibliografia

• 1. S. Ishihara, "How far has the molecular alignment of liquid crystals been elucidated?", J. Display Tech. 1, 1 (2005).
• 2. A.D.L. Chandani, E. Gorecka, Y. Ouchi, H. Takezoe, and A. Fukuda, "Antiferroelectric chiral smectic phases responsible for the tristable switching in MHPOBC", J. Appl. Phys. 28, 1265 (1989).
• 3. N.A. Clark and S.T. Lagerwall, "Submicrosecond bistable electro-optic switching in liquid crystals", Appl. Phys. Lett. 36, 899 (1980).
• 4. X. Quintana, P.L. Castillo, J.M. Otón, N. Bennis, A. Lara, V. Urruchi, and R. Dąbrowski, "Video-rate multiplexed driving scheme for passive antiferroelectric liquid crystal displays", Opto-Eelectron. Rev. 12, 291 (2004).
• 5. R.F. Shao, P.C. Willis, and N.A. Clark, "The field induced stripe texture in surface stabilized ferroelectric liquid crystal cells", Ferroelectric 121, 127 (1991).
• 6. P. Rudquist, J.P.F. Lagerwall, J.G. Meier, K. D'have, and S.T. Lagerwall, "Tilt plane orientation in antiferroelectic liquid crystals cells and the origin of the pretransitional effect", Phys. Rev. E66, 061708 (2002).
• 7. R. Beccherelli and S.J. Elston, "Evaluation of optical anisotropy in the pretransitional regime in antiferroelectric liquid crystals", Liq. Cryst. 25, 573 (1998).
• 8. N.S. Lee, G. Park, J.H. Lee, and S.D. Lee, "The pretransitional effect and helix unwinding process in homogeneously aligned antiferroelectric liquid crystals", Ferroelectrics 244, 549 (2000).
• 9. K.S. Park, H.J. Lee, and Y.J. Kim, "Surface dependence of electro-optical properties in antiferroelectric liquid crystal for thin film transistor addressing", Displays 21, 155 (2000).
• 10. J.M. Otón, J.M.S. Pena, X. Quintana, J.L. Gayo, and V. Urruchi, "Asymmetric switching of antiferroelectric liquid crystal cells", Appl. Phys. Lett. 78, 2422 (2001).
• 11. J.M. Otón, F.J. Lopez, V. Urruchi, J.L. Gayo, and X. Quintana, "Induced asymmetric antiferroelectric liquid crystal response", Ferroelectrics 268, 107 (2002).
• 12. M. Wakata, S. Tanoka, and S. Murata, "Aligning agent varnish for liquid crystals contains polyamic acid obtained by reacting tetracarboxylic acid and diamine compound, used, e.g., in thin film transistor liquid crystal elements", Japanese Patent WO2003005114-A, 2003.
• 13. K. Toshimitsu, N. Taeshi, S. Michio, M. Harumi, M. Koji, M. Tomohito, "Liquid crystal electrooptical device and its manufacturing method", Japanese Patent WO2002107770-A, 2002.
• 14. K. D'havé, P. Rudquist, S.T. Lagerwall, H. Pauwels, W. Drzewiński, and R. Dąbrowski, "Solution of the dark state problem in antiferroelectric liquid crystal displays", Appl. Phys. Lett. 76, 3528 (2000).
• 15. K. D'havé, A. Dahlgren, P. Rudquist, J.P.F. Lagerwall, G. Andersson, M. Matuszczyk, S.T. Lagerwall, R. Dąbrowski, and W. Drzewiński, "Antiferroelectric liquid crystals with 45 degrees tilt - A new class of promising electro-optic materials", Ferroelectrics 244, 115 (2000).
• 16. R. Dąbrowski, J. Gąsowska, J.M. Otón, W. Piecek, J. Przedmojski, and M. Tykarska, "High tilted antiferroelectric liquid crystalline materials", Displays 25, 9 (2004).
• 17. S.T. Lagerwall, A. Dahlgren, P. Jagemalm, P. Rudquist, K. D'havé, H. Pauwels, R. Dąbrowski, and W. Drzewiński, "Unique electro-optical properties of liquid crystals designed for molecular optics", Adv. Funct. Mater. 11, 2 (2001).
• 18. N. Bennis, R. Dąbrowski, A. Spadło, P. Kula, X. Quintana, and J.M. Otón, "Non-conventional alignment surfaces for antiferroelectric liquid crystals", Mol. Cryst. Liq. Cryst., 411, 307 (2004).
• 19. P. Rudquist, "Switching of orthoconic antiferroelectric liquid crystals", Oral presentation at 10th Conf. on Ferroelectric Liquid Crystals, Stare Jabłonki, Poland, Sept. 12-17, 2005.
• 20. A. Sinha, R. Dąbrowski, and W. Haase, "V-shaped switching in multi-component systems", Ferroelectrics 282, 229-238 (2003).
• 21. X. Quintana, J.L. Gayo, C. Rodrigo, V. Urrachi, and J.M. Oton, "Addressing waveforms for tristable AFLCs in active matrix displays", Ferroelectrics 246, 1117 (2000).