unit 110 attached to one surface of the display panel 120 the display panel 120 may have a structure in which a thin film transistor tft and a light emitting device for forming an image and an encapsulation layer for covering and protecting the tft and the light emitting device are stacked on a pliable flexible substrate the display panel 120 may use the pliable flexible substrate instead of a hard glass substrate accordingly the display panel 120 may be freely bent within an allowable range of its pliability the dielectric elastomer unit 110 may be provided along an edge of one surface of the display panel 120 the dielectric elastomer unit 110 may include first and second electrodes 111 and 112 that face each other and an electroactive polymer layer 113 between the first and second electrodes 111 and 112 for example as shown in fig3 a when a voltage is applied between the first and second electrodes 111 and 112 for example the electroactive polymer layer 113 may be extended in an in plane direction referring to fig2 a plurality of the dielectric elastomer units 110 may be arranged at predetermined intervals u2018 d u2019 along the edge of the display panel 120 due to the intervals u2018 d u2019 although the dielectric elastomer units 110 may surround the edge of the display panel 120 the display panel 120 may be pliably deformed without being affected by the dielectric elastomer units 110 if there are no intervals u2018 d u2019 even when the display panel 120 is so pliable because the dielectric elastomer units 110 that seamlessly surround the edge of the display panel 120 are hard the display panel 120 may not be.