Abstract
Polymer dispersed liquid crystal (PDLC) lenses with a cell gap of 11 μm and 30 μm were made from a uniformly dispersed mixture of 40% prepolymer (NOA 65, Norland optical adhesive 65) and 60% E7 liquid crystal. PDLC’s mixture between two ITO coated glasses was polymerized by UV (ultraviolet) curing in the polymerization induced phase separation (PIPS) process. Decline of cell gap is a physical approach to improve the electrooptical properties, while cooling or doping of SiO2 nanoparticles is the microstructural approach to enhance the properties, because the electric field applied to the liquid crystal molecules in LC droplets is inversely proportional to the cell gap. A smaller cell gap significantly and effectively increases the electric field applied to PDLCD devices. The driving voltages and slope for the sample with a cell gap of 11 μm and 30 μm were drastically improved. The driving voltage and the slope of the linear region of PDLC lens with narrow cell gap of 11 μm were drastically enhanced compared to those of the samples with 30 μm cell gap and the cooled and doped samples. These improvements were due to the increase of the applied electric field. However, the response time and contrast ratio were deteriorated. It seems that this deterioration was caused by the sticking or fixing of liquid crystal molecules in LC (liquid crystal) droplets by the intensive electric field applied to the PDLC device.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
J. Kim and J. I. Han, Electron. Mater. Lett. in press (2014). [DOI:10.1007/s13391-013-3223-y]
J. Kim and J. I. Han, Electron. Mater. Lett. in press (2014). [DOI:10.1007/s13391-013-3264-2]
J. I. Han, Proc. Int. Conf. on Consumer Electronics 2013, p. 338, IEEE Consumer Electronics Society, Las Vegas, USA (2013).
Y. J. Park, J. Kim, D. W. Kim, and J. I. Han, Proc. Conf. on Korean Liquid Crystal Conf., p. 134, Korea Information Display Society, Seoul, Korea (2013).
Y. J. Park, J. K. Park, J. Kim, D. W. Kim, and J. I. Han, Proc. Conf. on Korean Liquid Crystal Conf., p. 137, Korea Information Display Society, Seoul, Korea (2013).
H. Ren, Y.-H. Fan, and S.-T. Wu, J. Phys. D: Appl. Phys. 37, 400 (2004).
V. V. Presnyakov and T. V. Galstian, J. Appl. Phys. 97, 103101 (2005).
P. Malik, K. K. Raina, and A. K. Gathania, Thin Solid Films 510, 1047 (2010).
S. Park, H.-K. Kim, and J. W. Hong, Polym. Test. 29, 886 (2010).
T. Kyu, I. Ilies, and M. Mustafa, J. Phys. IV, 3, 37 (1993).
B. S. Bae, S. Han, S. S. Shin, K. Chen, C. P. Chen, Y. Su, and G. G. Jhun, Electron. Mater. Lett. 9, 735 (2013).
K. T. R. Reddy, P. A. Nwofe, and R. W. Miles, Electron. Mater. Lett. 9, 363 (2013).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Kim, J., Han, J.I. Effect of cell gap on electro-optical properties of polymer dispersed liquid crystal lens for smart electronic glasses. Electron. Mater. Lett. 10, 857–861 (2014). https://doi.org/10.1007/s13391-013-3305-x
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s13391-013-3305-x