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Novel photo-aligned twisted nematic liquid crystal (LC) cell based on onestep illumination with oblique unpolarized UV light of empty cell with azo-dye layers on ITO coated substrates is prepared. If the incident angle is high enough (>75 0 ), the Ppolarization of the light is more pronounced for the bottom azo-dye layer in comparison with the upper one. Thus the photo-alignment of azo-dye layer on the bottom substrate is perpendicular to that of the upper one and LC directors on the top anddoi:10.1143/jjap.44.5117 fatcat:6lzldx62szedfcpmaxmpoovwci