Index of content:
Volume 96, Issue 7, 01 October 2004
- LASERS, OPTICS, AND OPTOELECTRONICS (PACS 42)
96(2004); http://dx.doi.org/10.1063/1.1769088View Description Hide Description
The presence of ions in a liquid crystal(LC) influences the transmission characteristics of LC displays. These ions follow the electric field perpendicular to the electrodes and move back and forth under the influence of the ac field. Because of their charge, they can distort the electric field, which leads to transmission changes. Recently it was discovered that due to the LCanisotropy, ion motion parallel with the plane of the electrodes (perpendicular to the electric field) is also possible, even without lateral fields. After driving a pixel for a long time, the ions will accumulate at one pixel edge, which leads to unwanted image artifacts. In this paper, we investigate the frequency dependence of the lateral ion transport in twisted nematicliquid crystal displays at high and low ion concentrations, different ion mobilities, and LC rotational viscosities, for a fixed voltage just above the LC threshold.
96(2004); http://dx.doi.org/10.1063/1.1789632View Description Hide Description
An in-plane switching (IPS) liquid crystal(LC)gel for light shutter is demonstrated. In the voltage-off state, the LCgel is transparent. As the voltage exceeds a threshold, light scattering occurs due to microdomain formations. This light scattering is found to be polarization independent. Such an IPS LCgel is a broadband device and has a wide viewing angle and a relatively fast response time. Potential applications for switchable windows, variable optical attenuators, and reflective displays are considered.