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7 September 2006 Influence of ionic contamination on optical properties of LC cells
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The presence of ions in LC displays influences the performance of the displays through their transport driven by the applied voltage, especially at low driving frequencies. The ion transport causes important degradation of the electro-optical characteristics of displays. We present a model of the ion transport mechanisms taking place within a LC display. Various ionic effects with strongly different time constants are considered and two main competing driving potential screening effects are assumed, caused by free ions in LC layer and free ions in alignment layers, respectively. The role of insulation layers separating ions in LC from the electrodes is considered which can switch a cell between different regimes (cell decay and charging-up of the cell); also the asymmetry of the cell and the problem of balancing the LC and alignment layers ions are addressed. For various ion concentrations, the transmittance of the LC cell is calculated and compared with experimental results.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
T. Kranjc "Influence of ionic contamination on optical properties of LC cells", Proc. SPIE 6307, Unconventional Imaging II, 63070R (7 September 2006);

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