Effect of the Thickness of Alignment Layer on the Low-Frequency Dielectric Dispersion of a Nematic Liquid Crystal

1996 ◽  
Vol 35 (Part 2, No. 1B) ◽  
pp. L111-L113 ◽  
Author(s):  
Jun Nakanowatari ◽  
Katsumichi Ono
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Low Frequency ◽  
Dielectric Dispersion ◽  
Alignment Layer

scholarly journals Photocontrollable Resistivity Change in Nanoparticle-Doped Liquid Crystal Alignment Layer: Voltage Holding and Discharging Properties of Fringe-Field Switching Liquid Crystal Modes

Crystals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 268
Author(s):  
Jeong-Hoon Ko ◽  
Jun-Chan Choi ◽  
Dong-Jin Lee ◽  
Jae-Won Lee ◽  
Hak-Rin Kim
Keyword(s):  
Liquid Crystal ◽  
Power Saving ◽  
Low Frequency ◽  
Fringe Field ◽  
Resistance Level ◽  
Alignment Layer ◽  
Experimental Scheme ◽  
Tunable Range ◽  
Crystal Alignment ◽  
Operation Frequency

In liquid crystal (LC) displays, deriving an optimum resistance level of an LC alignment polyimide (PI) layer is important because of the trade-off between the voltage holding and surface-discharging properties. In particular, to apply a power-saving low-frequency operation scheme to fringe-field switching (FFS) LC modes with negative dielectric LC (n-LC), delicate material engineering is required to avoid surface-charge-dependent image flickering and sticking problems, which severely degrade with lowering operation frequency. Therefore, this paper proposes a photocontrolled variable-resistivity PI layer in order to systematically investigate the voltage holding and discharging properties of the FFS n-LC modes, according to the PI resistivity (ρ) levels. By doping fullerene into the high-ρ PI as the photoexcited charge-generating nanoparticles, the ρ levels of the PI were continuously controllable with a wide tunable range (0.95 × 1015 Ω∙cm to 5.36 × 1013 Ω∙cm) through Ar laser irradiation under the same LC and LC alignment conditions. The frequency-dependent voltage holding and discharge behaviors were analyzed with photocontrolled ρ variation. Thus, the proposed experimental scheme is a feasible approach in PI engineering for a power-saving low-frequency FFS n-LC mode without the image flickering and image sticking issues.

Study on polyvinylidene fluoride as alignment layer in twist-nematic liquid crystal display

2017 ◽  
Vol 45 (6) ◽  
pp. 857-863 ◽  
Author(s):  
Yi-Fei Wang ◽  
Yu-Qiang Guo ◽  
Ya-Xuan Ren ◽  
Ming-Zhu Fu ◽  
Ji-Liang Zhu ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Polyvinylidene Fluoride ◽  
Liquid Crystal Display ◽  
Alignment Layer

Effect of ferroelectric nanoparticles in the alignment layer of twisted nematic liquid crystal display

2017 ◽  
Vol 67 ◽  
pp. 7-13 ◽  
Author(s):  
Nimmy John V ◽  
E. Shiju ◽  
R. Arun ◽  
M.K. Ravi Varma ◽  
K. Chandrasekharan ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Liquid Crystal Display ◽  
Alignment Layer ◽  
Twisted Nematic ◽  
Twisted Nematic Liquid Crystal
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