A method of making a curved switchable filter is provided comprising forming a liquid-crystal cell, wherein forming the liquid-crystal cell comprises: forming a first transparent conductive electrode layer on a first optically-transparent flexible glass layer； bending the first optically-transparent flexible glass layer such that the first optically-transparent flexible glass layer is curved； disposing a liquid-crystal mixture on the transparent conductive electrode layer of the curved first optically-transparent flexible glass layer； forming a second transparent conductive electrode layer on a second optically-transparent flexible glass layer； and attaching the second optically-transparent flexible glass layer to the curved first optically-transparent flexible glass layer such that the second optically-transparent flexible glass layer is curved, wherein the first transparent conductive electrode layer, the second transparent conductive electrode layer, and the liquid-crystal mixture are disposed between the first optically-transparent flexible glass layer and the second optically-transparent flexible glass layer.
