[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.3807/JOSK.2014.18.2.184

Size Effect of Light Scattering on the Nano-Sized Color Filter Pigment in Liquid Crystal Display

Jhun, Chul Gyu (School of Green Energy & Semiconductor Engineering, Hoseo University)
Gwag, Jin Seog (Department of Physics, Yeungnam University)

Publication Information

Journal of the Optical Society of Korea / v.18, no.2, 2014 , pp. 184-187 More about this Journal

Abstract

This study examined the effects of particle size on the light scattering of a nano-sized color filter pigment used to obtain a range of colors in liquid crystal displays. The contrast ratio is one of the most important characteristics of liquid crystal displays. When a color filter is located between two crossed polarizers, the size of the pigment can give rise to a decrease in the contrast ratio due to Rayleigh scattering by the nanoparticles in the filter. The size effect of the color filter pigment on the contrast ratio was investigated in terms of the depolarization parameter. As an experimental result, the depolarization parameter increased with decreasing pigment size. Therefore, a smaller pigment size can reduce light leakage caused by light scattering in the color filter between two crossed polarizers. The depolarization function was also proposed as a useful function for predicting the decrease in the contrast ratio of the color filter.

Keywords

Liquid crystal display; Contrast ratio; Color filter; Scattering;

Citations & Related Records

Reference

1	A. Einstein, "The theory of the opalescence of homogeneous fluids and liquid mixtures near the critical state," Ann. Phys. 33, 1275-1298 (1910).
2	Y. Utsumi, I. Hiyama, Y. Tomioka, K. Kondo, and S. Matsuyama, "Analysis of light leakage caused by color filter between crossed polarizers," Jpn. J. Appl. Phys. 46, 1047-1050 (2007). DOI
3	M. Yoneya, Y. Utsumi, and Y. Umeda, "Depolarized light scattering from liquid crystals as a factor for black level light leakage in liquid-crystal displays," J. Appl. Phys. 98, 016106-016106-3 (2005). DOI ScienceOn
4	Y. Utsumi, I. Hiyama, Y. Tomioka, and K. Ono, "Quantitative analysis method for measuring light leakage intensity of three primary color filters placed between crossed polarizers," Jpn. J. Appl. Phys. 47, 3518-3521 (2008). DOI
5	G. A. Miller, "Fluctuation theory of the resonance enhancement of Rayleigh scattering in absorbing media," J. Phys. Chem. 82, 616-618 (1978). DOI
6	R. W. Boyd, Nonlinear Optics, 3rd ed. (Academic Press, Burlington, MA, USA, 2008).
7	J. D. Jackson, Classical Electrodynamics, 3rd ed. (John Wiley & Sons, Inc., New York, NY, USA, 1998).
8	T. Koseki, T. Kukunaga, H. Yamanaka, and T. Ueki, "Color filter for 10.4-in.-diagonal 4096-color thin-film-transistor liquid crystal displays," IBM J. Res. Develop. 36, 43-50 (1992). DOI
9	H. Moosmuller and W. P. Arnott, "Particle optics in the Rayleigh regime," J. Air & Waste Manage. Assoc. 59, 1028-1031 (2009). DOI
10	L. D. Landau, E. M. Lifshitz, and L. P. Pitaevskii, Electrodynamics of Continuous Media, 2nd ed. (Butterworth- Heinemann, Burlington, MA, USA, 1984).