5.3 / A. Muravsky 5.3: Determination of the Polar Anchoring Energy by Electrical Measurement

We propose a simple method for determination of polar anchoring coefficient by electrical measurements. The basic idea of this method is a two-channel scheme for capacitance measurements. The first channel uses one cell with planar alignment LC, the second channel uses the cell with vertical alignment (VA). Such method gives a possibility to investigate anchoring properties of planar and vertical alignment materials. Measurements of two cells at one time give possibility to compensate all volume effects in LC cell and investigate only surface effects. The method can be used for the cells, which do not have uniform planar or VA orientation. We applied this method to investigate the polar anchoring properties of photoaligning material before and after illumination. 1

Determination of the polar anchoring energy by electrical measurement

We propose a simple method for determination of polar anchoring coefficient by electrical measurements. The basic idea of this method is a two-channel scheme for capacitance measurements. The first channel uses one cell with planar alignment LC, the second channel uses the cell with vertical alignment (VA). Such method gives a possibility to investigate anchoring properties of planar and vertical alignment materials. Measurements of two cells at one time give possibility to compensate all volume effects in LC cell and investigate only surface effects. The method can be used for the cells, which do not have uniform planar or VA orientation. We applied this method to investigate the polar anchoring properties of photoaligning material before and after illumination. © 2005 SID

Integrated liquid crystal waveguide in polarization maintaining regime

The novel photonic devices based on integrated polarization maintaining Liquid Crystal waveguides are expected to have high optical performance in large photonic wavelength range, whereas the complexity of the design and the cost of the device are equivalent to regular passive matrix LC displays being cost efficient and friendly for mass-production. The combination of voltage controlled anisotropic properties of LC materials, specially shaped electrodes, pre-calculated applied voltage levels, dielectric layers and patterned liquid crystal alignment course the bulk of LC material to form a gradient waveguide. The layout of such LC waveguides can be created and switched by low voltages inside the liquid crystal cell. Suitable LC configurations were studied and optimized by commercial software LCD Master2D, Shintech. The waveguide properties were analyzed by the method of lines

Late-news poster: New results on bistable photoaligned ferroelectric LCDs: Grey scale generation, stabilization and passive driving scheme

The principles for intrinsic greyscale generation and stabilization of bistable photoaligned FLCD are discussed and investigated. In order to realize these principles, the passive matrix driving scheme for FLCD is proposed and studied. Passive 160×160 matrix addressing photoaligned 5μm reflective FLC display (48mm×46mm) with high contrast and 4 memorized grey scale levels is demonstrated. Images can be saved for very long time without any power supply. 15V driving voltage is only needed to refresh information, which is impressive and desirable for low power consumption display such as PDA, e-paper etc

Optical rewritable electronic paper with fluorescent dye doped liquid crystal

New optical rewritable (OR W) electronic paper is the joint result of advanced photoalignment of liquid crystals, optical engineering and flexible LCD technologies. We report improvement of both dark and bright states of reflective ORW e-paper by doping LC with fluorescent dye, which absorb blue light & emit in green with high efficiency