scholarly journals Hysteresis-free and submillisecond-response polymer network liquid crystal

2016 ◽  
Vol 24 (13) ◽  
pp. 14793 ◽  
Author(s):  
Yun-Han Lee ◽  
Fangwang Gou ◽  
Fenglin Peng ◽  
Shin-Tson Wu
Keyword(s):  
Liquid Crystal ◽  
Polymer Network

scholarly journals High-Contrast and Scattering-Type Transflective Liquid Crystal Displays Based on Polymer-Network Liquid Crystals

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 739 ◽  
Author(s):  
Cheng-Kai Liu ◽  
Wei-Hsuan Chen ◽  
Chung-Yu Li ◽  
Ko-Ting Cheng
Keyword(s):  
Liquid Crystal ◽  
Polymer Network ◽  
Liquid Crystal Displays ◽  
Quarter Wave Plate ◽  
High Contrast ◽  
Trade Off ◽  
Twisted Nematic ◽  
Quarter Wave ◽  
The Common ◽  
Linear Polarizer

The methods to enhance contrast ratios (CRs) in scattering-type transflective liquid crystal displays (ST-TRLCDs) based on polymer-network liquid crystal (PNLC) cells are investigated. Two configurations of ST-TRLCDs are studied and are compared with the common ST-TRLCDs. According to the comparisons, CRs are effectively enhanced by assembling a linear polarizer at the suitable position to achieve better dark states in the transmissive and reflective modes of the reported ST-TRLCDs with the optimized configuration, and its main trade-off is the loss of brightness in the reflective modes. The PNLC cell, which works as an electrically switchable polarizer herein, can be a PN-90° twisted nematic LC (PN-90° TNLC) cell or a homogeneous PNLC (H-PNLC) cell. The optoelectric properties of PN-90° TNLC and those of H-PNLC cells are compared in detail, and the results determine that the ST-TRLCD with the optimized configuration using an H-PNLC cell can achieve the highest CR. Moreover, no quarter-wave plate is used in the ST-TRLCD with the optimized configuration, so a parallax problem caused by QWPs can be solved. Other methods for enhancing the CRs of the ST-TRLCDs are also discussed.

Polymer network as a template for control of photoconductivity of a liquid crystal semiconductor

2004 ◽  
Vol 31 (9) ◽  
pp. 1265-1270 ◽  
Author(s):  
S. Krishna Prasad ◽  
Geetha G. Nair ◽  
Gurumurthy Hegde ◽  
Uma S. Hiremath ◽  
C. V. Yelamaggad
Keyword(s):  
Liquid Crystal ◽  
Polymer Network

scholarly journals Effect of Crosslinkers on Optical and Mechanical Behavior of Chiral Nematic Liquid Crystal Elastomers

Molecules ◽  
2021 ◽  
Vol 26 (20) ◽  
pp. 6193
Author(s):  
Kyosun Ku ◽  
Kyohei Hisano ◽  
Kyoko Yuasa ◽  
Tomoki Shigeyama ◽  
Norihisa Akamatsu ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Polymer Network ◽  
Molar Ratio ◽  
Stimuli Responsive ◽  
Breaking Strain ◽  
Responsive Materials ◽  
Sensor Applications ◽  
Color Changes ◽  
Chiral Nematic ◽  
Liquid Crystal Elastomers

Chiral nematic (N*) liquid crystal elastomers (LCEs) are suitable for fabricating stimuli-responsive materials. As crosslinkers considerably affect the N*LCE network, we investigated the effects of crosslinking units on the physical properties of N*LCEs. The N*LCEs were synthesized with different types of crosslinkers, and the relationship between the N*LC polymeric system and the crosslinking unit was investigated. The N*LCEs emit color by selective reflection, in which the color changes in response to mechanical deformation. The LC-type crosslinker decreases the helical twisting power of the N*LCE by increasing the total molar ratio of the mesogenic compound. The N*LCE exhibits mechano-responsive color changes by coupling the N*LC orientation and the polymer network, where the N*LCEs exhibit different degrees of pitch variation depending on the crosslinker. Moreover, the LC-type crosslinker increases the Young’s modulus of N*LCEs, and the long methylene chains increase the breaking strain. An analysis of experimental results verified the effect of the crosslinkers, providing a design rationale for N*LCE materials in mechano-optical sensor applications.

Fast Response Phase Modulator in Infrared Waveband Based on Polymer Network Liquid Crystal

2014 ◽  
Vol 34 (6) ◽  
pp. 0623001
Author(s):  
赵祥杰 Zhao Xiangjie ◽  
刘仓理 Liu Cangli ◽  
曾建成 Zeng Jiancheng ◽  
张大勇 Zhang Dayong ◽  
骆永全 Luo Yongquan
Keyword(s):  
Liquid Crystal ◽  
Polymer Network ◽  
Fast Response ◽  
Phase Modulator ◽  
Response Phase

Orientational order induced by a polymer network in the isotropic phase of liquid crystal

2020 ◽  
Vol 101 (5) ◽  
Author(s):  
V. Sergan ◽  
T. Sergan ◽  
I. Dozov ◽  
S. Joly ◽  
R. Voss
Keyword(s):  
Liquid Crystal ◽  
Polymer Network ◽  
Orientational Order ◽  
Isotropic Phase

scholarly journals Submillisecond-Response Polymer Network Liquid Crystal Phase Modulators

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2862
Author(s):  
Yannanqi Li ◽  
Zhiyong Yang ◽  
Ran Chen ◽  
Lingchao Mo ◽  
Juanli Li ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Light Scattering ◽  
Beam Steering ◽  
Polymer Network ◽  
Infrared Region ◽  
Dielectric Anisotropy ◽  
Spatial Light Modulators ◽  
Operating Voltage ◽  
Scattering Loss ◽  
Light Modulators

A submillisecond-response and light scattering-free polymer-network liquid crystal (PNLC) for infrared spatial light modulators is demonstrated. Our new liquid crystal host exhibits a higher birefringence, comparable dielectric anisotropy, and slightly lower visco-elastic constant than a commonly employed commercial material, HTG-135200. Moreover, the electro-optical performance of our PNLCs with different monomer concentrations, cell gaps, and liquid crystal (LC) hosts is compared and discussed from four aspects: operating voltage, hysteresis, relaxation time, and light scattering loss. The temperature effect on hysteresis is also analyzed. Potential applications of PNLCs for laser beam steering and spatial light modulators especially in the infrared region are foreseeable.

Analysis of Electro-Optic Properties of a Polymer Network Liquid Crystal Display with Crossed Polarizers

2007 ◽  
Vol 470 (1) ◽  
pp. 173-181 ◽  
Author(s):  
Sung-Ho Woo ◽  
Chan-Wook Jeon ◽  
Kee-Jeong Yang ◽  
Byeong-Dae Choi ◽  
Kumar Rajesh ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystal Display ◽  
Polymer Network ◽  
Electro Optic
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