[논문]A Study on Electro-optical Characteristics in Three Kinds of Liquid Crystal Display Operating Mode

Moon, Hyun-Chan; Bae, Yu-Han; Hwang, Jeoung-Yeon; Seo, Oae-Shik

doi:10.4313/teem.2005.6.2.073

[국내논문] A Study on Electro-optical Characteristics in Three Kinds of Liquid Crystal Display Operating Mode 원문보기

Transactions on electrical and electronic materials, v.6 no.2, 2005년, pp.73 - 77

Moon, Hyun-Chan (Department of Electrical and Electronic Engineering, Yonsei University) , Bae, Yu-Han (Department of Electrical and Electronic Engineering, Yonsei University) , Hwang, Jeoung-Yeon (Department of Electrical and Electronic Engineering, Yonsei University) , Seo, Oae-Shik (Department of Electrical and Electronic Engineering, Yonsei University)

Abstract ▼ AI-Helper

In this study, we investigated response characteristics of liquid crystal display (LCD) with different operating mode of nematic liquid crystals (NLCs) such as 45 $^{circ} twisted nematic (TN), 67.3 $^{circ} TN and electrical controlled birefringence (ECB) on the rubbed polyimide (PI) surface with side chains. The pretilt angles generated on polyimide surfaces of the three kinds of LCD operating modes were about 12 $^{circ} that was higher than those of conventional TN-LCOs. Also, the Electro-optical (EO) performance of these LCOs showed stable condition. Low transmittance of the 45 $^{circ} TN and 67.3 $^{circ} TN cell on the rubbed PI surface were measured by using low cell gap d. The fast response time in ECB cell among the three kinds of LCD operating modes was achieved. Also, thermal ability of fast 90 $^{circ} TN-LCD was investigated. The threshold voltage and the response time of thermal stressed TN-LCOs showed the same performances on no thermal stressed TN-LCOs. There was little change of value in these TN cells. However, the transmittances of TN-LCOs on the rubbed PI surface decreased while increasing thermal stress time. Therefore, the thermal stability of TN-LCD was decreased by the high thermal stress for the long duration.

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문제 정의

In particular, we concentrated on EO characteristics according to different NLC and cell gap because refractive indices and cell gap affect to the response time of LCD. Also, this study is designed to investigate the electro-optic change of LCD when exposed to intense heat for the duration.

제안 방법

In this paper, we studied fast response time and transmittance of LCD operating modes using 45 °TN,67.3 °TN and electrical controlled birefringence (ECB). In particular, we concentrated on EO characteristics according to different NLC and cell gap because refractive indices and cell gap affect to the response time of LCD.
In this study, the EO characteristics of NLCs with different operating modes such as 45 ° TN, 67.3 ° TN and ECB on a rubbed PI surface were investigated. These operating modes had good EO characteristics.

이론/모형

The voltagedependent transmittance (V-T) and response time measurements were performed at room temperature (22℃). The pretilt a电le of anti-parallel cell was measured by the crystal rotation method. The EO characteristics were measured by using the LCD evaluation system.

참고문헌 (6)

M. Oh-e and K. Kondo, 'Response mechanism of nematic liquid crystal using the in-plane switching mode', Appl. Phys. Lett., Vol. 69, No. 13, p. 623, 1996
T. Miyashita, Y. Yamaguchi, and T. Uchida, 'Wideviewing- angle display mode using bend-alignment liquid crystal liquid crystal cell', Jpn. J. Appl. Phys., Vol. 34, No. 2A, p. 177, 1995
J. Y. Hwang, J. H. Kim, and D. S. Seo, 'Electrooptical performances of the vertical-alignment -1/4 $\pi$ cell photoaligned on a homeotropic photopolymer surface', Jpn. J. Appl. Phys., Vol. 40, No. 11A, p. 1166,2001

상세보기
H. Y. Kim, Y. J. Jeon, J. Y. Hwang, J. H. Kim, and D. S. Seo, 'Residual DC characteristics in the IPS-LCD by capacitance-voltage hysteresis method on a polymer layer', Current Applied Physics, Vol. 2, No. 3, p. 237, 2002
D. S. Seo, K. Araya, N. Yoshida, M. Nishikawa, Y. Yabe, and S. Kobayashi, 'Effect of the polymer tilt angle for generation of pretilt angle in nematic liquid crystal on rubbed polyimide surfaces', Jpn. J. Appl. Phys., Vol. 34, No. 4B, p. L503, 1995
M. Nishikawa, N. Bessho, T. Natsui, Y. Ohta, N. Yoshida, D. S. Seo, Y. Iimura, and S. Kobayashi, 'A model of the unidirectional alignment accompanying pretilt angle of nematic liquid crystal (NLC), 5CB, oriented on the rubbed organic-solvent-soluble polyimide film', Mol. Cryst. & Liq. Cryst., Vol. 275, p. 15, 1996

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