Method of forming alignment film

A method of forming an alignment film, comprising:

• providing a photosensitive polymer material, wherein the photosensitive polymer material defines a first pixel area and a second pixel area each defining a first sub-pixel area and a second sub-pixel area;
• in a first exposure, irradiating the photosensitive polymer material with a first exposure light and a second exposure light to form a first alignment portion and a second alignment portion in the first sub-pixel area of the first pixel area and the second sub-pixel area of the second pixel area respectively, wherein the alignment direction of the first alignment portion is different from that of the second alignment portion;
• in a second exposure, irradiating the photosensitive polymer material with the first exposure light and the second exposure light to form a third alignment portion and a fourth alignment portion in the second sub-pixel area of the first pixel area and the first sub-pixel area of the second pixel area respectively, wherein the alignment direction of the third alignment portion is different from that of the fourth alignment portion.