Grey level control through thickness variations in antiferroelectric LCD'S

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Abstract
Using a uniform bookshelf model, we can describe the behaviour of antiferroelectric liquid crystals in an electric field. In the integrated LC energy density, we make a distinction between two contributions: Bulk energy, which consists of antiferroelectric coupling and coupling with the electric field, and surface energy, comprising the area anchoring. As soon as the ratio of these contributions varies over the surface of a pixel, grey levels are possible. This can be achieved by a varying anchoring constant or a varying thickness. In this paper, we discuss the influence of thickness variations of the LC layer on the grey scale control.