Analysis of electro‐optical properties of polymer‐stabilized OCB and the application to TFT‐LCDs

Abstract

Abstract— A 9‐in. full‐color polymer‐stabilized OCB TFT‐LCD with stable bend alignment in the absence of an electric field was developed. The condition of the polymer stabilization, the characteristics of UV‐curable monomers, and their influence on the configurations of the polymer network in the cell were studied. Possible models of the configuration were proposed and their relationship to the electro‐optical properties was analyzed using a novel simulation method considering the distribution of anchoring effects from both alignment surfaces and the polymer network. It was suggested that a good performance such as high contrast ratio and fast response could be expected in the polymer network originating from newly developed monomers composed of multifunctional LC acrylates due to a relatively weak‐anchoring effect and presumably its localization near the alignment surfaces. By using the newly developed monomers under the optimized polymer‐stabilizing process, a high contrast ratio of 250:1 and fast response nearly equal to that of a conventional OCB cell were achieved.

Mechanism of electric-field-induced segregation of additives in a liquid-crystal host

“…Causing a polymer layer to be localized on the surface has applications not only in new types of electro-optical devices, but also for information displays. In the polymer stabilized vertical alignment system [3], it has been pointed out that it is beneficial to polymerize monomers on a LC boundary [4][5][6][7] to achieve better electric-optic properties of the devices, such as response time, driving voltage, and viewing angles. However, those papers [4][5][6][7] did not make the mechanism of the electric-field effect on monomer segregation clear.…”

Normal and Reverse Mode Light Scattering Properties in Nematic Liquid Crystal Cell Using Polymer Stabilized Effect

“…The nematic LC / polymer composite system has also been applied to a polymer stabilizing and polymer-sustained technologies to enhance the cell performance [19][20][21][22][23][24][25]. The RM of typically less than 5 wt% is dissolved in the LC to get the polymer stabilized effect.…”

“…The RM of typically less than 5 wt% is dissolved in the LC to get the polymer stabilized effect. When the cell is polymerized under the voltage application to form a proper polymer network in a bulk, the network causes a lower driving voltage and faster response [20,[22][23][24][25].…”

Study of the bend oriented liquid crystal phase grating

“…The desired fast liquid crystal grating will be used in nematic liquid crystals, and its cell gap will be larger than 3 µ. The bend oriented liquid crystal device is a promising technology for liquid crystal display with fast response time . It could avoid the “backflow” effect and has a faster response speed than the parallel alignment liquid crystal devices with the same parameters.…”

“…The bend oriented liquid crystal device is a promising technology for liquid crystal display with fast response time. [9][10][11][12][13][14] It could avoid the "backflow" effect and has a faster response speed than the parallel alignment liquid crystal devices with the same parameters. In this paper, we present a bend oriented liquid crystal grating.…”