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Liquid-Crystal Micro-Lens Array with Square-Shaped Electrodes

We propose a liquid-crystal (LC) micro-lens array with a flat external electrode in addition to two-divided and square-shaped electrodes for electrically controlling cylindrical or spherical lens properties in each LC cell of the lens array. The LC micro-lens array is useful for tuning optical properties such a focal length and deflection angle of a light emitting diode illumination system.