A device is disclosed. The device includes a substrate, and a plurality of spacers arranged on one side of the substrate. Each spacer has a cross section taken in a direction parallel with the substrate, where a size of the cross section of each spacer in a length direction is greater than a size of the cross section of each spacer in a width direction. In addition, an angle between the length direction of the cross section of the spacer and an X-direction of the substrate is greater than about 0° and less than about 90°, or greater than about 90° and less than about 180°.