Improved Nucleation and Transition by Plasma Treatments for Fast Response Optically-Compensated-Bend Displays

• Authors: G. Wu , C. Huang , H. Chien
• Languages of publication: EN

Abstracts

EN

The optically-compensated-bend mode pi-cell displays exhibit fast-response time and wide-viewing angle characteristics. However, it requires a transition of the liquid crystal molecule from an initial splay state to the bend state configuration before providing the quick operation. A high voltage and a long warm-up time are needed to transform to the bend state. In this paper, the polyimide alignment films have been modified to reduce the splay-to-bend transition time by plasma beam treatments. The proposed method was demonstrated to be highly effective in improving the overall transition time. The number of splay-to-bend nucleation sites in the assembled liquid crystal cells could be increased dramatically by up to 20 times at the initial stage, and the improvement in the cell warm-up time was achieved at 45-71% reduction at 5.5 V. The plasma processing parameters were optimized at the plasma power of 700 W, the plasma distance of 25 mm, and the plasma scan speed of 600 mm/s. In addition, we maintained the excellent optical properties and response time characteristics for the optically-compensated-bend mode liquid crystal displays.

Keywords

EN

52.77.-j; 81.65.-b; 42.79.Kr; 64.60.Q-

Discipline

• 52.77.-j: Plasma applications
• 81.65.-b: Surface treatments(for surface preparation and lithography in microelectronics, see 85.40.-e)
• 64.60.Q-: Nucleation(see also 82.60.Nh Thermodynamics of nucleation in physical chemistry and chemical physics)
• 42.79.Kr: Display devices, liquid-crystal devices(see also 85.60.Pg Display systems)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2013
• Volume: 123
• Issue: 5
• Pages: 892-895

Dates

published

2013-05

Contributors

author

G. Wu

• Institute of Electro-Optical Engineering, Green Technology Research Center, Chang Gung University, Kweisan, Taoyuan 333, Taiwan R.O.C.

author

C. Huang

• Institute of Electro-Optical Engineering, Green Technology Research Center, Chang Gung University, Kweisan, Taoyuan 333, Taiwan R.O.C.

author

H. Chien

• Institute of Electro-Optical Engineering, Green Technology Research Center, Chang Gung University, Kweisan, Taoyuan 333, Taiwan R.O.C.

References

• 1. K. Kuboki, T. Miyashita, T. Isinabe, T. Uchida, Mol. Cryst. Liq. Cryst. 410, 391 (2004)
• 2. C.L Kuo, T. Mifashita, M. Suzuki, T. Uchida, Appl. Phys. Lett. 68, 1461 (1996)
• 3. S.W. Kim, L.C. Chien, Jpn. J. Appl. Phys. 43, 7643 (2004)
• 4. G.M. Wu, H.W. Chien, J.W. Huang, H.L. Zeng, Nanotechnology 21, 134022 (2010)
• 5. Y. Sun, H. Ma, Z. Li, Z. Zhang, R. Guan, Appl. Phys. Lett. 90, 091103 (2007)
• 6. F. Ogasawara, K. Kuboki, K. Wako, T. Uchida, A. Yoshizawa, Jpn. J. Appl. Phys. 48, 051507 (2009)
• 7. Y. Kizu, R. Hasegawa, Y. Kizaki, I. Amemiya, S. Uchikoga, in: SID Int. Symp. Dig. Tech. Papers, Eds. I. Kymissis, T. Fiske, Society for Information Display, Los Angeles 2008, p. 28
• 8. C.Y. Huang, R.X. Fung, Y.G. Lin, Jpn. J. Appl. Phys. 46, 5230 (2007)
• 9. Y.K. Jang, P. Bos, Jpn. J. Appl. Phys. 46, 5821 (2007)

Identifiers

DOI

10.12693/APhysPolA.123.892