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Low-Threshold-Voltage and Electrically Switchable Polarization-Selective Scattering Mode Liquid Crystal Light Shutters
oleh: Zhe-Yung Liang, Ching-Yen Tu, Tsung-Hsun Yang, Cheng-Kai Liu, Ko-Ting Cheng
Format: | Article |
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Diterbitkan: | MDPI AG 2018-12-01 |
Deskripsi
Low-threshold-voltage (V<sub>th</sub>) and electrically switchable, polarization-selective scattering mode light shutters (PSMLSs) using polymer-dispersed liquid crystals (PDLCs) are demonstrated in this work. The optimized weight ratio of the nematic liquid crystals (LCs) to the adopted monomer (NBA107, Norland Optics) in the low-V<sub>th</sub> PDLCs based on NBA107 is 7:3, [7:3]-PDLCs<sub>NBA107</sub>. The properties of the low-V<sub>th</sub> PDLCs<sub>NBA107</sub>, such as light-scattering performance, initial transmission, V<sub>th</sub>, and droplet size were investigated. Experiment results show that the surface anchoring (threshold-voltage) of NBA107 is weaker (lower) than or equal to that of the common NOA65. The cost is that the response time of the proposed PDLCs<sub>NBA107</sub> is relatively long. A method to reduce the decay time, which can be applied to all other PDLC devices, will be elucidated. In addition to the low V<sub>th</sub> of the proposed PDLCs<sub>NBA107</sub>, the operation voltage (~6 V<sub>rms</sub>) to approach the maximum transmission is relatively low in a 7 μm-thick PDLCs<sub>NBA107</sub> cell. Moreover, the polarization-selective light-scattering performances of the proposed PSMLSs based on the [7:3]-PDLCs<sub>NBA107</sub>, mainly driven by in-plane and vertical fields, are also demonstrated.