Improvement of fast response LC materials by bent-core dopants in Optical Compensated Bend (OCB) mode liquid crystal displays

Ling Yung Wang; Shin Yi Tsai; Hong-Cheu Lin; Szu Fen Fenny Chen; Robert Lyu; Chi Neng Mo

doi:10.1889/1.3069684

Improvement of fast response LC materials by bent-core dopants in Optical Compensated Bend (OCB) mode liquid crystal displays

Ling Yung Wang, Shin Yi Tsai, Hong-Cheu Lin^*, Szu Fen Fenny Chen, Robert Lyu, Chi Neng Mo

^*Corresponding author for this work

Department of Materials Science and Engineering

Research output: Contribution to journal › Conference article › peer-review

1 Scopus citations

Abstract

The stabilization of bend configuration in optical compensated bend (OCB) mode cells by doping bent-core molecules was developed in this study. The values of response time (i) and threshold voltage (V_th) in OCB cells were dependent on not only the concentration but also the shape, dipole direction, and flexible chain length of the doping molecules. Experimental results showed that the total response time (τ_total) and threshold voltage (V_th) of OCB cells could be reduced by doping bent-core molecules, and smaller i values by reducing flexible chain lengths as well as smaller V_th values by reducing polarization of bent-core molecules were normally obtained. In general, higher concentrations of dopants normally induced shorter field-on response time (τ_on) and a minimum field-off response time (τ_off) occurred at 0.5% of doping concentration, where the fastest total response time (τ_total) values were achieved.

Original language	English
Pages (from-to)	40-43
Number of pages	4
Journal	Digest of Technical Papers - SID International Symposium
Volume	39
Issue number	1
DOIs	https://doi.org/10.1889/1.3069684
State	Published - 1 Jan 2008
Event	2008 SID International Symposium - Los Angeles, CA, United States Duration: 20 May 2008 → 21 May 2008

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abstract = "The stabilization of bend configuration in optical compensated bend (OCB) mode cells by doping bent-core molecules was developed in this study. The values of response time (i) and threshold voltage (Vth) in OCB cells were dependent on not only the concentration but also the shape, dipole direction, and flexible chain length of the doping molecules. Experimental results showed that the total response time (τtotal) and threshold voltage (Vth) of OCB cells could be reduced by doping bent-core molecules, and smaller i values by reducing flexible chain lengths as well as smaller Vth values by reducing polarization of bent-core molecules were normally obtained. In general, higher concentrations of dopants normally induced shorter field-on response time (τon) and a minimum field-off response time (τoff) occurred at 0.5% of doping concentration, where the fastest total response time (τtotal) values were achieved.",

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AU - Wang, Ling Yung

AU - Tsai, Shin Yi

AU - Lin, Hong-Cheu

AU - Chen, Szu Fen Fenny

AU - Lyu, Robert

AU - Mo, Chi Neng

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AB - The stabilization of bend configuration in optical compensated bend (OCB) mode cells by doping bent-core molecules was developed in this study. The values of response time (i) and threshold voltage (Vth) in OCB cells were dependent on not only the concentration but also the shape, dipole direction, and flexible chain length of the doping molecules. Experimental results showed that the total response time (τtotal) and threshold voltage (Vth) of OCB cells could be reduced by doping bent-core molecules, and smaller i values by reducing flexible chain lengths as well as smaller Vth values by reducing polarization of bent-core molecules were normally obtained. In general, higher concentrations of dopants normally induced shorter field-on response time (τon) and a minimum field-off response time (τoff) occurred at 0.5% of doping concentration, where the fastest total response time (τtotal) values were achieved.

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Improvement of fast response LC materials by bent-core dopants in Optical Compensated Bend (OCB) mode liquid crystal displays

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