scholarly journals Study of the vertically aligned in-plane switching liquid crystal mode in microscale periodic electric fields

2018 ◽  
Vol 9 ◽  
pp. 11-19 ◽  
Author(s):  
Artur R Geivandov ◽  
Mikhail I Barnik ◽  
Irina V Kasyanova ◽  
Serguei P Palto
Keyword(s):  
Liquid Crystal ◽  
Electric Fields ◽  
Grating Period ◽  
Surface Mode ◽  
Switching Speed ◽  
Electric Pulses ◽  
Display Technology ◽  
Vertically Aligned ◽  
New Applications ◽  
Micrometer Scale

The ongoing interest in fast liquid crystal (LC) modes stimulated by display technology and new applications has motivated us to study in detail the in-plane switching (IPS) vertically aligned (VA) mode. We have studied how the decrease of the period of the interdigitated electrodes (down to sub-micrometer scale) influences the switching speed, especially the LC relaxation to the initial homeotropic state. We have found that there are two types of the relaxation: a fast relaxation caused by the surface LC sub-layer deformed in the vicinity of the electrodes and the slower relaxation of the bulk LC. The speed of the fast (surface) mode is defined by half of a period of the electrode grating, while the relaxation time of the bulk depends on the LC layer thickness and the length of the driving electric pulses. Thus, the use of the surface mode and the reduction of the electrode grating period can result in significant increase of switching speed compared to the traditional LC modes, where the bulk relaxation dominates in electrooptical response. We have studied thoroughly the conditions defining the surface mode applicability. The numerical simulations are in good agreement with experimental measurements.

Polymerization Effects on the Electro-Optic Properties of a Polymer Stabilized Ferroelectric Liquid Crystal

1996 ◽  
Vol 425 ◽  
Author(s):  
C. Allan Guymon ◽  
Lisa A. Dougan ◽  
Erik N. Hoggan ◽  
Christopher N. Bowman
Keyword(s):  
Liquid Crystal ◽  
Polymer Network ◽  
Polymeric Materials ◽  
Ferroelectric Polarization ◽  
Mechanical Shock ◽  
Switching Speed ◽  
Ferroelectric Liquid Crystals ◽  
Electro Optic ◽  
Polymerization Behavior ◽  
Display Technology

AbstractThe introduction of polymeric materials into liquid crystal (LC) matrices has been the focus of much interest in recent years. When a small percentage of polymer network is introduced, the mechanical strength of an LC system increases dramatically without significantly altering the electro-optic properties of the LC. One particular group of LCs, namely, ferroelectric liquid crystals (FLCs), are excellent candidates for such stabilization. FLCs, despite showing great potential for use in electro-optic and display technology due to inherently fast switching times and bistability, have found limited use as they are extremely susceptible to mechanical shock. This study examines the effects of polymerization conditions of a diacrylate monomer in an FLC on its inherent electro-optic properties. The LC phase in which polymerization occurs has a dramatic effect on the polymerization behavior and formation of the polymer network. Such effects have interesting implications on the ferroelectric polarization and switching speed of the FLC. As the temperature of polymerization increases and thus the order of the LC phase decreases, the ferroelectric polarization and the switching time increase.

scholarly journals Induced alignment of a reactive mesogen-based polymer electrolyte for dye-sensitised solar cells

RSC Advances ◽  
2017 ◽  
Vol 7 (51) ◽  
pp. 31989-31996 ◽  
Author(s):  
M. A. Kamarudin ◽  
A. A. Khan ◽  
E. Tan ◽  
G. Rughoobur ◽  
S. M. Said ◽  
...  
Keyword(s):  
Solar Cells ◽  
Liquid Crystal ◽  
Polymer Electrolyte ◽  
Electric Fields ◽  
Directed Polymer ◽  
Polymer Templates ◽  
Alignment Layers ◽  
Micrometer Scale

Controlling the morphology of liquid crystal-directed polymer templates at the micrometer scale using external alignment layers and electric fields.

Numerical modelling of twisted nematic devices

1983 ◽  
Vol 309 (1507) ◽  
pp. 203-216 ◽  
Keyword(s):  
Liquid Crystal ◽  
Electric Fields ◽  
Low Cost ◽  
Three Dimensional ◽  
Physical Parameters ◽  
Crystal Layer ◽  
Liquid Crystal Layer ◽  
Chiral Nematic ◽  
Twisted Nematic ◽  
Three Dimensional Simulations

Over most of each active region in nematic and chiral nematic twist cells the motion and configuration of the liquid crystal layer does not vary appreciably with position parallel to the surfaces. In such laminar regions the statics, dynamics and optics ot the cell can be accurately simulated at low cost on a computer of moderate size, given the appropriate physical parameters. Methods and recent advances in simulation of laminar regions are reviewed. Bistable twist cells are simulated for illustration. Important problems of stability and edge effects in the presence of electric fields await solution with two- or three-dimensional simulations.

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