Effect of Nanoparticles Addition on Ion Current and Electro-optical Characteristic in Surface Stabilized Ferroelectric Liquid Crystal Cells
Date Issued
2007
Date
2007
Author(s)
Liu, Yung-Wei
DOI
en-US
Abstract
Liquid crystal displays (LCDs) usually contain many ions that come from either the raw material itself or from impurities during cell fabrication. These ions are dissociated by applying voltage to form an inverse electric field inside the cell and cause lots ion effects such as flickers, image sticking, etc. Such ion effects are the main cause to influence the LCD quality. Among the liquid crystal material science, ferroelectric liquid crystal (FLC) is a material with great potentiality for the high switching speed, but also have drawback for large ion concentration. Therefore, how to effectively reduce the ion concentration is an crucial issue on FLC for application of display technology in the future.
The purpose of this study is to observe and compare the effect of nanoparticles addition on ion current and electro-optical characteristic in surface-stabilized ferroelectric liquid crystal (SSFLC). We prepare SSFLC cells doped with three kinds of nanoparticles such as diamond powder, TiO2 and SiO2. Experimentally, we use polarizing microscope to observe the surface alignment of the samples; set up and proceed the transmittance and transient current measurements.
Experimental results show that nanoparticles addition in SSFLC cell do not significantly influence its electric-optical performance. However, the ion currents of doped SSFLC cells are enormously decreased as the doping concentration increase. And the ion concentration can be lowered to 1/30 of pure SSFLC cells. Such results reveal that the ion effects of FLCD can be weakened by simply adding nanoparticles into it without influence its electric-optical performance. This may have a great contribution on the application of display technology in the future.
Subjects
液晶
鐵電型
液晶顯示器
離子效應
奈米粒子
liquid crystal
ferroelectric
LCD
ion effect
nanoparticles
Type
thesis
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