Embodiments of the present invention provide an array substrate, an optical grating, a display panel and a display device, so as to enable displaying different images in different directions in accordance with the arrangement of subpixels on the array substrate. Moreover, since in one direction only an image corresponding to said direction can be viewed, it would not be influenced by images displayed in other directions. The array substrate comprises a plurality of pixel groups, each pixel group comprises a first category of subpixel group for displaying a preset gray scale and a second category of subpixel group for displaying images of multiple viewpoints; wherein the second category of subpixel group may comprise a first subpixel group, a second subpixel group, a third subpixel group and a fourth subpixel group for displaying a first viewpoint image, a second viewpoint image, a third viewpoint image, and a fourth viewpoint image, respectively; the first subpixel group and the third subpixel group are adjacent to the first category of subpixel group in the vertical direction; the second subpixel group and the fourth subpixel group are adjacent to the first category of subpixel group in the horizontal direction.