Preview

Bulletin of State University of Education. Series: Physics and Mathematics

Advanced search

SETUP FOR SIMULTANEOUS MEASUREMENT OF AZIMUTHAL AND POLAR ANCHORING ENERGY OF LIQUID CRYSTAL WITHIN SINGLE CELL IN AUTOMATIC REGIME

Abstract

New applications of liquid crystal materials in fabrication processes of LC panels, 3D displays, organic semiconductor and photonic devices has significantly broadened the requirements to the performance and characteristics of modern alignment materials. Development of novel alignment materials is impossible without effective and reliable control of the anchoring energy of the materials. However the present measurement methods of these parameters often being of low precision have high labour intensity of measurement. In this paper the authors’ principles of simultaneous measurement of azimuthal and polar anchoring energy of liquid crystal within single twist-nematic lqiudi crystal cell are presented. The innovative measurement methods are implemented in setup for simultaneous measurement of azimuthal and polar anchoring energy of liquid crystal within cell in automatic regime based on series polarizing microscope «Micro 200T» JSC ‘Optoelectronic Systems’, Belarus.

About the Authors

An. . Murauski
Institute of chemistry of new materials of National Academy of Sciences of Belarus
Russian Federation


Al. . Muravsky
Institute of chemistry of new materials of National Academy of Sciences of Belarus
Russian Federation


V. . Agabekov
Institute of chemistry of new materials of National Academy of Sciences of Belarus
Russian Federation


References

1. Yokoyama H and H.A. van Sprang, A novel method for determining the anchoring energy function at a nematic liquid-crystal wall interface from director distortion at high fields, J. Appl. Phys. 57, pp. 4520-4526 (1985)

2. Murauski A., Chigrinov V., Muravsky A., Fion S.-Y. Yeung, J. Ho, and H-S. Kwok. Determination of the polar anchoring energy by electrical measurement, Phys. Rev. E71, 061707(2005)

3. Nastishin Yu.A., Polak R.D., Shiyanovskii S.V., Bodnar V.H., and Lavrentovich O.D. Nematic polar anchoring strength measured by electric field techniques, J. Appl. Phys. 86, No. 8, pp. 4199-4213 (1999)

4. Toko Y., Akahane T. Evaluation of Pretilt Angle and Polar Anchoring Strength of Amorphous Alignment Liquid Crystal Display from Capacitance Versus Applied Voltage Measuremen, Mol. Cryst. Liq. Cryst. Sci. Technol. 368, pp.469-481 (2001)

5. Muravsky, Al. An. Murauski, V. Mazaeva, V. Belyaev. Parameters of LC Alignment on Films of Organosilicon Compounds, J. Soc. Inf. Displ. 13, pp. 349-356 (2005)

6. Zhou Y., He Z., Sato S. Generalized Relation Theory of Torque Balance Method for Azimuthal Anchoring Measurements, Jpn. J. Appl. Phys. 38, pp.4857 (1999)

7. Konovalov V. A., Muravski A. A., Yakovenko S.Ye., Pelzl J. An Accurate Spectral Method for Measuring Twist Angle of Twisted Cells with Rubbed and Grooved Surfaces, SID Symp. Dig. Tech. Pap. 31, 1, pp. 620-623 (2000)

8. Murauski A., Chigrinov V. and Kwok H-S. New method for measuring polar anchoring energy of nematic liquid crystals, Liq. Cryst. 36, No.8, pp. 779-786 (2009)


Review

Views: 71


Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.


ISSN 2949-5083 (Print)
ISSN 2949-5067 (Online)