Patent ID: 8692970

Claim:
A manufacturing method of a liquid crystal display device, which is a manufacturing method of a liquid crystal display device including a liquid crystal alignment film to which the alignment regulating force is imparted by a photo-alignment treatment, comprising: a film forming step of forming a film containing a polymer whose main chain is cleaved by irradiation with light, wherein the polymer is a compound represented by the following chemical formula (1): wherein R represents a divalent electron-donating organic group selected from an amino group (—NH—) and an alkoxy group (—OC n H 2n —); and n represents the number of repeating units of the polymer; a photo-alignment step of imparting the alignment regulating force to the film formed in the film forming step by irradiation of the film with light in an atmosphere of a temperature lower than 100° C.; and a removing step of removing a low-molecular weight component generated by cleaving the main chain of the polymer through the light irradiation after the light irradiation.