浮接電極應用於高分子藍相液晶顯示器之效應研究

Abstract

By placing a floating electrode on the upper substrate, it has been found to be very helpful in modifying the electric field profile in a Polymer Stabilized Blue Phase Liquid Crystal (PS-BPLC) cell such that the overall transmission can be increased. A major advantage of floating electrode is that it doesn’t require application of a driving voltage and hence no extra TFT is required and it is very convenient and low cost. We will investigate and report the results on the effects of floating electrode on PS-BPLC with different electrode shapes, dimensions and material constants such as Kerr constants. We also further investigate the effects on electric fields with different shapes and dimensions of floating electrode. These can all affect the electric field distribution profile and hence PS-BPLC transmission and operation voltage. Our preliminary results show that the floating electrode can indeed improve the overall transmission of the PS-BPLC displays quite remarkably by decreasing the “dead zone” areas. A brand new design of floating electrode is proposed, we call it “distributed floating electrode” design. This new design requires less transparent electrode area, lower operation voltage while maintaining similar transmittance as in tradition floating electrode design. Moreover, this new design also has the potential of reducing the image sticking problem that may be caused by the traditional floating design and may allow higher transmission due to less transparent electrode area. In addition, we use Matlab to scan electric field in whole region along z-direction, visualize the electric field distribution in 3D diagram of every structure. The designs and computer simulations were carried out using a commercially available LCD modeling software 3D Techwiz (Sanayi System) from Korea.