Disclosed is a display device, comprising an array substrate and a color filter substrate which are opposite to each other, and wall-spacers, the wall-spacers being arranged between the array substrate and the color filter substrate and being in an area surrounding a display area formed by the array substrate and the color filter substrate. The wall-spacers are made of an electrostriction material, and a vertical distance between the array substrate and the color filter substrate in the area surrounding the display area is adjusted by applying different driving voltages to the wall-spacers.