Decreasing the Residual DC Voltage by Neutralizing the Charged Mobile Ions in Liquid Crystals

Abstract

The decrease of the residual direct current (DC) voltage (Vrdc) of the anti-parallel liquid crystal (LC) cell using silver (Ag)-doped Polyimide (Ag-d-PI) alignment layers is presented in this manuscript. A series of Ag/PI composite thin layers are prepared by spurting or doping PI thin layers with Ag nano-particles, and Ag/PI composite thin layers are highly transparent and resistive. LC are homogeneously aligned between 2.0 mg/ml Ag-d-PI alignment layers, and the Vrdc of the cell that assembled with Ag-d-PI alignment layers decreases about 82%. The decrease of Vrdc is attributed to the trapping and neutralizing of mobile ions by Ag nano-particles. Regardless of the effect of Ag nano-particles on the conductivity of Ag-d-PI alignment layers, the voltage holding ratio (VHR) of the cells is maintained surprisingly. The experiment results reveal a simple design for a low Vrdc LC cell.

A Mesoporous Silica Nanoparticle-Doped Photo-Alignment Layer and Liquid Crystal Layer for Optimizing the Rewriting Speed and the Response Time of Optically Driving Liquid Crystal Displays

“…The alignment of LC molecules is an important factor in determining the electro-optic properties of LCDs. The conventional alignment method of LCD is the universally rubbing method due to its low cost, simplicity, mature technology, and large-area fabrication [11,12]. However, rubbing technology may cause electrostatic charges and impurities as well as mechanical damage to the surface [13].…”

P‐12.13: Increasing the Rewriting Speed of Optically Driving Liquid Crystal Display by NiO Doping

“…Conventional method of friction (or rubbing) technology is universally used in the production due to the low cost and the technology maturity. However, in recent years, new non-friction method (non-rubbing) technologies, for examples no-alignment-layer alignment [1] and photo-alignment [2] are developed to break through the limitation of friction method and fulfill the production requirements.…”

Vanadium Dioxide Nanoparticle Doped Polyimide Hybrid Alignment Layers for Flexible Liquid Crystal Displays

“…Polyimides (PIs) are the most common alignment layers in LCDs because of their excellent dielectric property and super optical performance, but their additional shielding effect on the external electrical field slows down the switch of LCs. , These days nanomaterials are doped in PI alignment layers and show remarkable feasibilities in modulating the alignment of LCs and accelerating their switch. For instance, LCs sandwiched between opal crystal thin layers are homeotropically aligned because of the undulated surface topography, and the LCs sandwiched between SiO 2 doped PI alignment layers are homogeneously aligned in electrically controlled birefringence (ECB) mode with a much higher transmittance because of the improved order parameter ( S ); carbon nanotube (CNT) doped PI alignment layers with the reconstructed surface topologies, large elastic constant, and large order parameter are efficient to accelerate the switch of LCs; , the conjugated block copolymer alignment layers with two-dimensionally (2D) networked embedded ultrathin single wall carbon nanotubes (SWNTs) also show significant advantages in superfast switching LCs at lower operating voltage; silver nanoparticle doped PI alignment layers are highly transparent and are able to trap the mobile ions in LCs to reduce the residual direct current; ferroelectric zinc oxide (ZnO) doped PI alignment layers producing the local electric field can trigger the orientation of LCs, and the augmentation of capacitance with the increase in doping concentration also reduces the switching voltage; , high transparent ferroelectric barium titanate (BaTiO 3 ) nanoparticle doped hybrid alignment layers reduce the Frederik operating voltage and the saturation voltage of LCs …”