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Using a commercially produced liquid crystal display as a polarization filter

This paper describes the characterization of the polarization modulation produced by a commercially manufactured liquid crystal television from which the polarizers have been removed. Experimental results are compared with a Jones matrix model of the display which has been developed by researchers at UCL. Experimental analysis shows that the behavior of the device agrees with prediction, but deviates quantitatively for certain input polarizations. An algorithm has been developed to determine an unknown input polarization from intensity measurements taken through a fixed analyzer, with the display at several different applied voltages. The commercially produced display, apart from its potentially lower cost, due to mass production, has the advantage that it has a large number of pixels. This allows selective control or measurement of the polarization across the two dimensional input field of view.