Transient Response Characteristics of Polymer Stabilized Bend Alignment State of Nematic Liquid Crystal in Pi-Cell

Asakawa, Youichi; Takahashi, Taiju; Saitō, Susumu

doi:10.1143/jjap.46.7774

Cited by 3 publications

(1 citation statement)

References 10 publications

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“…Therefore, splay mode suppression or reduction for response time and threshold voltage needs further investigation. Based on the prior literature, many of methods have been developed to improve the response time and stabilize the bend alignment, such as processes of chiral dopants (Huang et al, 2007) and organic reactive monomers to generate polymer walls by UV curing approaches (Kikuchi et al, 2005;Chien et al, 2002;Asakawa et al, 2007). Moreover, nano-sized dopant materials, including nanoparticles (Kobayashi et al, 2004;Kobayashi et al, 2002;Miranda, 2006;Boilot et al, 2007;Kobayashi et al, 2007) and nanotube dopants, (Huang et al, 2006) have also been used to enhance the electro-optical properties of various LCDs.…”

Section: Introductionmentioning

confidence: 99%

Dopant effects of photoreactive ZnO nanoparticles on fast response LC materials in optical compensated bend (OCB) mode liquid crystal displays

Lin

Jiang

Wang

et al. 2010

Journal of the Chinese Institute of Engineers

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Mo (2010) Dopant effects of photoreactive ZnO nanoparticles on fast response LC materials in optical compensated bend (OCB) mode liquid crystal displays, ABSTRACTPhotoreactive ZnO nanoparticles containing surface-modified acrylate groups were synthesized and applied to improve the threshold voltage in optical compensated bend (OCB) mode liquid crystal display (LCD) cells. The dopant effects of ZnO nanoparticles with or without commercial reactive monomer additives (1 wt% doping ratio) on the values of threshold voltage (V th ) and response time in OCB cells were explored by applying different voltages to photo-reactive ZnO nanoparticles during UV curing processes in OCB cells to compare the influences of doped ZnO nanoparticles. As a result, we successfully eliminated or reduced the splay state of OCB mode and thus reduced threshold voltage. However, lower transmissions and higher values of the response time were observed in OCB cells doped with photoreactive ZnO nanoparticles, and the decreasing of V th is independent of various doping materials. Moreover, lower transmission and high response time could be improved through sequential voltage-applied procedures, i.e., bend black mode (10 V) → bend white mode (2.5 V), under the immobile minimum threshold voltage at the bent state during UV curing processes to achieve lower pre-transition and fast response time properties by only doping photoreactive ZnO nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Dopant effects of photoreactive ZnO nanoparticles on fast response LC materials in optical compensated bend (OCB) mode liquid crystal displays

Lin

Jiang

Wang

et al. 2010

Journal of the Chinese Institute of Engineers

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Polymer-stabilized Nematics and Their Applications

Morris

2019

Polymer-Modified Liquid Crystals

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The addition of a polymer network to nematic liquid crystals (LC) was a notable milestone in the research and development of liquid crystalline materials. It was found that, not only did it improve the ruggedness and stability of the resulting films and devices, but it also increased the diversity in the electro-optic characteristics, and in some cases yielded important improvements in the resulting device performance. Polymer-stabilized nematics are composites that are typically obtained by doping a relatively small concentration by weight (typically <10wt%) of a polyfunctional monomer into the LC solvent. When cross-linked this leads to an interpenetrating polymer network that stabilizes, and to some degree phase separates from, the nematic host. These materials exhibit macroscopic physical and electro-optic properties that readily distinguish them from conventional side and main chain elastomers/polymers and polymer-dispersed LCs. In this Chapter, our objective is to consider the role that the polymer network plays on the resulting electro-optic characteristics of nematic LCs, primarily the threshold voltage and response times. Their behaviour will be compared with that observed in conventional, non-polymer-stabilized nematic devices. We also consider the experimental results obtained for different device architectures in which polymer-stabilization has been implemented and the advantages and disadvantages of introducing a polymer network for the electro-optic properties. The Chapter concludes with a brief overview of the role advanced fabrication techniques might play in the future development of polymer-stabilized nematic LCs and the use of polymer-stabilization to form tuneable microlenses.

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Improvement of fast responsive LC materials by bent-core dopants in optical compensated bend mode liquid crystal displays

Lin

Wang

Jiang

et al. 2011

Journal of the Chinese Institute of Engineers

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Transient Response Characteristics of Polymer Stabilized Bend Alignment State of Nematic Liquid Crystal in Pi-Cell

Cited by 3 publications

References 10 publications

Dopant effects of photoreactive ZnO nanoparticles on fast response LC materials in optical compensated bend (OCB) mode liquid crystal displays

Dopant effects of photoreactive ZnO nanoparticles on fast response LC materials in optical compensated bend (OCB) mode liquid crystal displays

Polymer-stabilized Nematics and Their Applications

Improvement of fast responsive LC materials by bent-core dopants in optical compensated bend mode liquid crystal displays

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