According to an embodiment of the present invention, a display device comprises: a display unit including a plurality of pixels; a connection unit arranged on the display unit; a plurality of shape-variable units arranged on the connection unit wherein shapes of the shape-variable units are changed in accordance with an applied physical quantity; and adjusting units configured to vary the physical quantity applied to the shape-variable units to adjust refraction of light by the shape-variable units wherein the light is emitted from the pixels. Therefore, the display device can adjust a viewing angle and brightness.
