A display device comprising: a housing, a light-transmitting cover plate, and a display panel disposed in the housing, wherein the display device comprises a display area constituted by the display panel, and a frame area surrounding the display panel, wherein the light-transmitting cover plate covers the housing to form the outer surface of the display device; wherein the light-transmitting cover plate has a first light-transmitting part coextensive with the display area and a second light-transmitting part coextensive with the frame area, the second light transmitting part having an incidence surface and an exit surface; wherein the display panel is arranged to emit light in an outward direction through the first light-transmitting part and the second light-transmitting part; wherein the exit surface of the second light-transmitting part is provided with an optical film, said optical film disposed only on the exit surface and configured to refract the light emitted by the display panel through the second light-transmitting part so that a direction of the light transmitted from the second light-transmitting part is substantially parallel with a normal to the first light-transmitting part and the same as a direction of the light transmitted from the first light-transmitting part, and wherein either: the incidence surface and the exit surface are horizontal surfaces parallel to the display panel and to each other, and a refractive index of the optical film is greater than a refractive index of the second light-transmitting part; or the incidence surface is a horizontal surface extending parallel to the display panel while the exit surface is an inclined surface, and a refractive index of the optical film is smaller than a refractive index of the second light-transmitting part. a housing, a light-transmitting cover plate, and a display panel disposed in the housing, wherein the display device comprises a display area constituted by the display panel, and a frame area surrounding the display panel, wherein the light-transmitting cover plate covers the housing to form the outer surface of the display device; wherein the light-transmitting cover plate has a first light-transmitting part coextensive with the display area and a second light-transmitting part coextensive with the frame area, the second light transmitting part having an incidence surface and an exit surface; wherein the display panel is arranged to emit light in an outward direction through the first light-transmitting part and the second light-transmitting part; wherein the exit surface of the second light-transmitting part is provided with an optical film, said optical film disposed only on the exit surface and configured to refract the light emitted by the display panel through the second light-transmitting part so that a direction of the light transmitted from the second light-transmitting part is substantially parallel with a normal to the first light-transmitting part and the same as a direction of the light transmitted from the first light-transmitting part, and wherein either: the incidence surface and the exit surface are horizontal surfaces parallel to the display panel and to each other, and a refractive index of the optical film is greater than a refractive index of the second light-transmitting part; or the incidence surface is a horizontal surface extending parallel to the display panel while the exit surface is an inclined surface, and a refractive index of the optical film is smaller than a refractive index of the second light-transmitting part. the incidence surface and the exit surface are horizontal surfaces parallel to the display panel and to each other, and a refractive index of the optical film is greater than a refractive index of the second light-transmitting part; or the incidence surface is a horizontal surface extending parallel to the display panel while the exit surface is an inclined surface, and a refractive index of the optical film is smaller than a refractive index of the second light-transmitting part.