Comparison of organic and inorganic alignment layers for low-power liquid-crystal devices using low-frequency applied-voltage waveforms

2010 ◽  
Vol 18 (3) ◽  
pp. 206 ◽  
Author(s):  
Yi Huang ◽  
Achintya Bhowmik ◽  
Philip Bos
Keyword(s):  
Liquid Crystal ◽  
Low Power ◽  
Applied Voltage ◽  
Low Frequency ◽  
Liquid Crystal Devices ◽  
Alignment Layers

scholarly journals Formation of self-assembled periodic grooves via thermal drawing lithography for alignment layers in liquid crystal devices

Soft Matter ◽  
2011 ◽  
Vol 7 (1) ◽  
pp. 270-274 ◽  
Author(s):  
Tzu-Chieh Lin ◽  
Li-Chen Huang ◽  
Chiu-Chiang Huang ◽  
Chih-Yu Chao
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystal Devices ◽  
Self Assembled ◽  
Alignment Layers ◽  
Thermal Drawing

scholarly journals Stabilization of Long-Pitch Supertwisted Nematic Structures

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1541
Author(s):  
Masahiro Ito ◽  
Satoshi Ohmi ◽  
Kohki Takatoh
Keyword(s):  
Applied Voltage ◽  
Large Reduction ◽  
Stabilization Process ◽  
Liquid Crystal Devices ◽  
Twisted Nematic ◽  
Clearing Point ◽  
Twisted Nematic Liquid Crystal ◽  
Alignment Layers ◽  
Structure Stabilization ◽  
Twist Structure

Stabilized reverse twisted nematic liquid crystal devices (RTN-LCDs) were fabricated using formation of a polymer matrix under UV irradiation with an applied voltage (sustain voltage) in the vicinity of the alignment layers. In the absence of an applied voltage, the non-stabilized RTN structure gradually returns to a splay twist structure. The sustain voltage was decreased with an increase in temperature. A stabilized long-pitch supertwisted nematic (LPSTN) structure could also be formed during the RTN structure stabilization process with a much lower sustain voltage at a temperature near the clearing point. The chiral pitch for the LPSTN structure is longer than that for a typical STN structure. LPSTN-LCDs similar to RTN-LCDs show a large reduction in both the threshold and saturation voltage compared with those for TN-LCDs consisted of the same LC materials. Furthermore, a notable feature of LPSTN-LCDs is a change to a TN structure when a high voltage is applied. A black state can be realized due to the change from the LPSTN structure to the RTN structure unlike the typical STN mode under the crossed nicols condition. In contrast STN-LCDs retain their color due to the retardation because the RTN and LPSTN states are considered topologically equivalent.

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