The invention discloses an array substrate, a 3D display panel and a 3D display device. The array substrate includes a plurality of sub-pixel units arranged in an array. Each of the sub-pixel units has a shape of a non-equilateral parallelogram having two short sides and two long sides. The two short sides are the top side and the bottom side. The sub-pixel units in a same row are inclined in the same direction at a same inclination angle with respect to a vertical direction. The top sides of the sub-pixel units in the same row lie on a straight line. The projection of the top side of each of the sub-pixel units in the vertical direction lies on and overlaps with the bottom side of an adjacent sub-pixel unit.