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A method of making a polymer dispersion type liquid crystal display element including a phase separation step. The method calls for placing a liquid crystal polymer precursor compatible solution having a liquid crystal and a polymer precursor between a pair of substrates, each having an inside elect

A method of making a polymer dispersion type liquid crystal display element including a phase separation step. The method calls for placing a liquid crystal polymer precursor compatible solution having a liquid crystal and a polymer precursor between a pair of substrates, each having an inside electrode, and irradiating a substrate surface with ultraviolet. The radiation causes a phase separation of the liquid crystal and the polymer precursor as well as polymerization and curing of the precursor. The method forms a polymer dispersion type liquid crystal having liquid crystal droplets dispersed and held in a continuous matrix phase or a three-dimensional network matrix. During the phase separation step, the irradiation time is controlled from the beginning of irradiation to the completion of phase separation to influence any of the degree of polymerization of the precursor in the solution, the rate of phase separation, and the generating density of the separated liquid crystal nuclei so that the dispersed liquid crystal droplets have even particle sizes.

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1. A method for producing a polymer dispersion type liquid crystal display element,said method comprising a phase separation step in which after a liquid crystal polymer precursor compatible solution including liquid crystal and polymer precursor is placed between a pair of substrates each having an

1. A method for producing a polymer dispersion type liquid crystal display element,said method comprising a phase separation step in which after a liquid crystal polymer precursor compatible solution including liquid crystal and polymer precursor is placed between a pair of substrates each having an electrode at the inside thereof, a surface of said substrates is irradiated with ultraviolet so that said liquid crystal and said polymer precursor in said liquid crystal polymer precursor compatible solution can be phase-separated from each other and also said polymer precursor can be polymerized and cured, to thereby produce a polymer dispersion type liquid crystal in which liquid crystal droplets are dispersed and held in a continuous phase of matrix comprising polymer compound or are dispersed and held in networks of a three dimensional network form of matrix comprising polymer compound, wherein, in the phase separation step, where T1 is the time from said irradiation of ultraviolet until the initiation of phase separation of said liquid crystal polymer precursor compatible solution and T10-90 is the time required for a rate of progress of phase separation to change from 10% to 90% when the rate of progress of the phase separation for all liquid crystals to be separated from said liquid crystal polymer precursor compatible solution is defined as 100%, particle sizes of the liquid crystal droplets dispersed and held in said matrix are evened by controlling said time T1, said time T10-90, or both of said time T1 and T10-90.