Photo-controlled conformation-assisted permanent optical storage device employing a polymer network liquid crystal

2009 ◽  
Vol 11 (30) ◽  
pp. 6450 ◽  
Author(s):  
Vallamkondu Jayalakshmi ◽  
Gurumurthy Hegde ◽  
Geetha Gopinathan Nair ◽  
Subbarao Krishna Prasad
Keyword(s):  
Liquid Crystal ◽  
Polymer Network ◽  
Optical Storage ◽  
Storage Device

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.

Optical storage effect in a platinum orthometalated liquid crystal

1998 ◽  
Vol 66 (3) ◽  
pp. 355-358 ◽  
Author(s):  
J. Buey ◽  
L. Díez ◽  
P. Espinet ◽  
H.-S. Kitzerow ◽  
J.A. Miguel
Keyword(s):  
Liquid Crystal ◽  
Optical Storage ◽  
Storage Effect

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

Photoactive Fluorinated Poly(azomethine)s with Azo Groups in the Main Chain for Optical Storage Applications and Controlling Liquid Crystal Orientation

2019 ◽  
Vol 2 (2) ◽  
pp. 455-463
Author(s):  
Andrii I. Kovalchuk ◽  
Yaroslav L. Kobzar ◽  
Ihor M. Tkachenko ◽  
Yuriy I. Kurioz ◽  
Olexsandr G. Tereshchenko ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Crystal Orientation ◽  
Main Chain ◽  
Optical Storage ◽  
Liquid Crystal Orientation

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
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