scholarly journals Process for a Reactive Monomer Alignment Layer for Liquid Crystals Formed on an Azodye Sublayer

Materials ◽  
2018 ◽  
Vol 11 (7) ◽  
pp. 1195 ◽  
Author(s):  
Junren Wang ◽  
Colin McGinty ◽  
Robert Reich ◽  
Valerie Finnemeyer ◽  
Harry Clark ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Ultra Violet ◽  
Uv Curing ◽  
Curing Temperature ◽  
Alignment Layer ◽  
Reactive Monomer ◽  
Surface Polymerization ◽  
Voltage Curve ◽  
Photo Alignment ◽  
Almost All

In this work, the detailed studies of surface polymerization stabilizing liquid crystal formed on an azodye sublayer are presented. The surface localized stabilization is obtained by free-radical polymerization of a dilute solution of a bi-functional reactive monomer (RM) in a liquid crystal (LC) solvent. To optimize the process for surface localized stabilization, we investigate the effects of several process parameters including RM concentration in LC hosts, the types of materials (either RM or LC), the photo-initiator (PI) concentration, ultra-violet (UV) polymerization intensity, and the UV curing temperature. The quality of surface localized stabilization is characterized and/or evaluated by optical microscopy, electro-optical behavior (transmission/voltage curve), the life test, and photo-bleaching. Our results show that, by carefully selecting materials, formulating mixtures, and controlling the polymerizing variables, the RM polymerization can be realized either at the surface or through the bulk. Overall, the combination of surface localized stabilization and photo-alignment offers an elegant and dynamic solution for controlling the alignment for LC, which could play a profound role in almost all liquid crystal optical devices.

P.98: Novel Composite Photo-alignment Layer for Ferroelectric Liquid Crystal Display

2013 ◽  
Vol 44 (1) ◽  
pp. 1353-1354
Author(s):  
Qi Guo ◽  
Abhishek Srivastava ◽  
Ying Ma ◽  
Eugene Pozhidaev ◽  
Vladimir Chigrinov ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystal Display ◽  
Ferroelectric Liquid Crystal ◽  
Alignment Layer ◽  
Photo Alignment

Annihilation of Photochemical Reactivity of Photo-Alignment Layer

2008 ◽  
Vol 8 (9) ◽  
pp. 4611-4615 ◽  
Author(s):  
S. H. Hong ◽  
Y. J. Hwang ◽  
S. G. Lee ◽  
D. M. Shin
Keyword(s):  
Functional Groups ◽  
Contrast Ratio ◽  
Ultra Violet ◽  
Annihilation Process ◽  
Polyimide Films ◽  
Alignment Layer ◽  
Liquid Polymer ◽  
Reactive Carbon ◽  
Polarization Axis ◽  
Photo Alignment

The gas-polymer and liquid-polymer interfacial reactions of photosensitive polyimide can annihilate photo-reactive carbon–carbon double bonds, which remain after photo-alignment process. The annihilation processes dramatically affect voltage holding ratio and reorientation of photo-active functional groups. Photochemical dimerizations were identified using UV-visible and FT-IR spectroscopy. Polyimide films containing cinnamate groups were irradiated by linear polarized ultra violet (LPUV) light. Schadt et al. claims that the photo-alignment results from the anisotropy depletion of the cinnamate side chains as a consequence of the (2 + 2) cycloaddition reactions.1 The photoaligned polyimide induces the orientation of nematic liquid crystals perpendicular to the polarization axis.1,2 However, the un-reacted photo-sensitive functional groups generate problems such as image sticking and reduced contrast ratio. Voltage holding ratio and photo-fading observed from photo-alignment layer can be dramatically improved by annihilation process of remnant photoreactive groups.

Cinnamate-functionalized hyperbranched polymer as liquid crystal photo-alignment layer

2008 ◽  
Vol 19 (9) ◽  
pp. 1131-1134 ◽  
Author(s):  
Bin Jun Shen ◽  
Zheng Xie ◽  
Ya Ning He ◽  
Yan Qing Lian
Keyword(s):  
Liquid Crystal ◽  
Hyperbranched Polymer ◽  
Alignment Layer ◽  
Photo Alignment

Stable azodye photo-alignment layer for liquid crystal devices achieved by “turning off” dye photosensitivity

2017 ◽  
Vol 122 (20) ◽  
pp. 205301 ◽  
Author(s):  
C. McGinty ◽  
V. Finnemeyer ◽  
R. Reich ◽  
H. Clark ◽  
S. Berry ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Alignment Layer ◽  
Liquid Crystal Devices ◽  
Photo Alignment

P-118: Azo Dye, Liquid Crystals Polymer Composite Photo-Alignment Layer for Modern Liquid Crystal Displays

2016 ◽  
Vol 47 (1) ◽  
pp. 1566-1569 ◽  
Author(s):  
Cui-Ling Meng ◽  
Man-Chun Tseng ◽  
Chung-Yung Lee ◽  
Abhishek K. Srivastava ◽  
Vladimir G. Chigrinov ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Polymer Composite ◽  
Azo Dye ◽  
Liquid Crystal Displays ◽  
Alignment Layer ◽  
Photo Alignment
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