Disclosed is a pixel electrode and an array substrate. The pixel electrode comprises four pixel domains, each of which is divided into a first alignment unit and a second alignment unit. The first alignment unit and the second alignment unit can be used to form a first electric field and a second electric field respectively, and the first and second electric fields are different in intensity. The pixel electrode effectively reduces color distortions on a large-size liquid crystal display device observed from a large viewing angle as well as ensures an aperture ratio of a pixel, which enhances the competitiveness of a product.