there is provided a plastic liquid crystal display device in which an aligning film processing can be carried out at 150 to 180 ° c . and which can have optical characteristics comparable to those of the conventional glass substrate liquid crystal display device . the plastic liquid crystal device comprises a pair of plastic substrates , transparent electrodes , insulating films for protecting the electrodes , aligning films and a liquid crystal , wherein the aligning film is an aligning film which is formed by dissolving a high - temperature sintering organic polymer aligning film made of polyimide or a polyimide - like substance in a solvent , printing a resulting solution thereof on a substrate , removing only the solvent by heating and / or heating under reduced pressure , and sintering the substrate at 200 ° c . or less .