The invention relates to the technical field of display and discloses an array substrate. The array substrate comprises a substrate and a pixel array layer located on the substrate, and also comprises a grating layer which is formed by a plurality of light blocking strips spaced at a preset distance and is used for 3D display. The grating layer is located at one side of the pixel array layer, which is back on to the substrate, or located at one side of the substrate, which faces the pixel array layer, or located at one side of the substrate, which is back on to the pixel array layer; the light blocking strips are used for reflecting light rays irradiated to the pixel array layer through the substrate. According to the array substrate disclosed by the invention, the grating layer is arranged at one side of the array substrate, which is back on to the pixel array layer, and the light blocking strips of the grating layer can be used for reflecting the light rays irradiated to the pixel array layer through the substrate. When display is performed, the light which is emitted from a backlight source and does not transmit the grating layer is reflected to the backlight source, and as the backlight source is usually provided with a light guide plate for the light to be diffused, and the light reflected to the backlight source is reflected again by the light guide plate to transmit the grating layer, the display brightness is improved.