The development of self-assembled liquid crystal display alignment layers

2007 ◽  
Vol 365 (1855) ◽  
pp. 1553-1576 ◽  
Author(s):  
Johan Hoogboom ◽  
Johannes A.A.W Elemans ◽  
Alan E Rowan ◽  
Theo H.M Rasing ◽  
Roeland J.M Nolte
Keyword(s):  
Liquid Crystal ◽  
Indium Tin Oxide ◽  
Self Assembly ◽  
Liquid Crystal Display ◽  
Alignment Layer ◽  
Siloxane Oligomers ◽  
Mobile Telephones ◽  
Phthalocyanine Dyes ◽  
Alignment Layers ◽  
Potential Use

From simple pocket calculators to mobile telephones and liquid crystal display (LCD)-TV, over the past few decades, devices based on LCD technology have proliferated and can now be found in all conceivable aspects of everyday life. Although used in cutting-edge technology, it is surprising that a vital part in the construction of such displays, namely the alignment layer, relies essentially on a mechanical rubbing process, invented almost 100 years ago. In this paper efforts to develop alignment layers (also called command layers) by processes other than rubbing, namely self-assembly of molecular and macromolecular components will be discussed. Two topics will be presented: (i) tuneable command layers formed by stepwise assembling of siloxane oligomers and phthalocyanine dyes on indium tin oxide surfaces and (ii) command layers formed by self-assembly of porphyrin trimers. The potential use of these layers in sensor devices will also be mentioned.

Molecular design of some semi-alicyclic polyimides as a route to improve refraction and dielectric properties for liquid crystal display applications

2017 ◽  
Vol 30 (7) ◽  
pp. 776-786
Author(s):  
Andreea Irina Barzic ◽  
Raluca Marinica Albu ◽  
Emil Ghiocel Ioanid ◽  
Camelia Hulubei
Keyword(s):  
Liquid Crystal ◽  
Molecular Design ◽  
Liquid Crystal Display ◽  
Polymer Surface ◽  
Alignment Layer ◽  
Display Devices ◽  
Parallel Arrangement ◽  
Crystal Alignment ◽  
The One ◽  
Alignment Layers

The study establishes an adequate monomer combination for achieving the best balance of properties required in obtaining polyimide alignment layers for display devices. The molecular design of some aliphatic/aromatic polyimides was performed by using dianhydride monomers with distinct configurations in terms of rigidity, size, and symmetry. The polyimides based on semi-flexible and nonsymmetric dianhydride moieties present lower refractive index and dielectric constant (<3) than those obtained from symmetric and rigid dianhydride units. This determines faster traveling of visible and microwave radiations as required for liquid crystal alignment purposes. The interactions of samples with the N-(4-Methoxybenzylidene)-4-butylaniline, cyanobiphenyl, and 4-pentyl-4-cyanobiphenyl nematics were assessed. The analyzed polyimides have higher surface tensions than the ones of the liquid crystals, determining a parallel arrangement of the nematic molecules. As the dispersive interactions at the polymer surface are lower, the work of spreading is higher as a result of improved adhesion of liquid crystal with the polyimide alignment layer. The sample containing rigid, symmetric, noncoplanar dianhydride units (PI.4) and the one based on semi-flexible, nonsymmetric dianhydride moieties are the most transparent for visible and microwave radiations, allowing low cohesion interaction at interface with nematics. These aspects recommend the two studied polyimides as candidates for alignment layers.

Enhancement of Contrast Ratio by Using Ferroelectric Nanoparticles in the Alignment Layer of Liquid Crystal Display

2008 ◽  
Vol 47 (6) ◽  
pp. 4751-4754 ◽  
Author(s):  
Sudarshan Kundu ◽  
Mitsuhiro Akimoto ◽  
Itaru Hirayama ◽  
Masaru Inoue ◽  
Shunsuke Kobayashi ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystal Display ◽  
Contrast Ratio ◽  
Alignment Layer

scholarly journals Fabrication of New Liquid Crystal Device Using Layer-by-Layer Thin Film Process

Processes ◽  
2018 ◽  
Vol 6 (8) ◽  
pp. 108 ◽  
Author(s):  
Gitae Moon ◽  
Wonjun Jang ◽  
Intae Son ◽  
Hyun Cho ◽  
Yong Park ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Indium Tin Oxide ◽  
Film Growth ◽  
Mechanical Stability ◽  
Liquid Crystal Display ◽  
Layer By Layer ◽  
Transparent Electrodes ◽  
Ito Electrode ◽  
Display Performance ◽  
Layer Thin Film

Indium tin oxide (ITO) transparent electrodes are troubled with high cost and poor mechanical stability. In this study, layer-by-layer (LBL)-processed thin films with single-walled carbon nanotubes (SWNTs) exhibited high transparency and electrical conductivity as a candidate for ITO replacement. The repetitive deposition of polycations and stabilized SWNTs with a negative surfactant exhibits sufficiently linear film growth and high optoelectronic performance to be used as transparent electrodes for vertically aligned (VA) liquid crystal display (LCD) cells. The LC molecules were uniformly aligned on the all of the prepared LBL electrodes. VA LCD cells with SWNT LBL electrodes exhibited voltage-transmittance (V-T) characteristics similar to those with the conventional ITO electrodes. Although the response speeds were slower than the LCD cell with the ITO electrode, as the SWNT layers increased, the display performance was closer to the LCD cells with conventional ITO electrode. This work demonstrated the good optoelectronic performance and alignment compatibility with LC molecules of the SWNT LBL assemblies, which are potential alternatives to ITO films as transparent electrodes for LCDs.

Plastic Liquid Crystal Display with Polarizers Integrated Inorganic Conducting and Alignment Layers

2013 ◽  
Vol 583 (1) ◽  
pp. 52-59
Author(s):  
Phil Kook Son ◽  
Suk-Won Choi ◽  
Sung Soo Kim ◽  
Seok-Cheol Ko
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystal Display ◽  
Alignment Layers

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

Improvement of Electro-Optical Characteristics of Liquid Crystal Display by Nanoparticle-Embedded Alignment Layers

2009 ◽  
Vol 508 (1) ◽  
pp. 1/[363]-13/[375] ◽  
Author(s):  
Mitsuhiro Akimoto ◽  
Sudarshan Kundu ◽  
Koutarou Isomura ◽  
Itaru Hirayama ◽  
Shunsuke Kobayashi ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystal Display ◽  
Optical Characteristics ◽  
Alignment Layers

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

Orientation of Ferroelectric Liquid Crystals by Self-Assembled Bilayer Molecular Assembly

2001 ◽  
Vol 709 ◽  
Author(s):  
Sukhmal C. Jain ◽  
Vivechana Dixit ◽  
Vinod K. Tanwar ◽  
S. M. Shivaprasad
Keyword(s):  
Liquid Crystal ◽  
Indium Tin Oxide ◽  
Photoelectron Spectroscopy ◽  
Self Assembly ◽  
Uv Light ◽  
Uv Spectroscopy ◽  
Large Change ◽  
Molecular Assembly ◽  
Ferroelectric Liquid Crystal ◽  
Assembly Technique

ABSTRACTMolecular films of amino propyl triethoxy silane (APTES) attached with cinnamoyl moieties were deposited on indium tin oxide (ITO) coated glass and quartz substrates by self-assembly technique. The deposition of the monolayer films resulted in a large change in the wettability of the substrates. X-ray photoelectron spectroscopy (XPS) and UV-spectroscopy were used to study the structure and properties of the grown films. The molecular assembly was photodimerized by irradiating it with a linearly polarized UV-light. Thus created polymer-solid interface has been shown to produce good, stable planar orientation of ferroelectric liquid crystal mixtures. The electro-optical and switching properties of the ferroelectric liquid crystal cells have been investigated and found to be quite similar to those prepared in conventional manner.

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