A display device for reducing at least one of a reduction of luminance and a color shift caused by a light guide element, the display device comprising: a display panel having a display area in which a plurality of display elements for displaying an image are disposed in a matrix, wherein the display panel has a frame area in which no display element is provided and which is located at an end of the display panel; a light guide element provided in a display area end portion of the display panel so as to be located above the frame area, the light guide element being adapted to change a light path of the light emitted from display elements in said display area end portion of the display area so that part of the light is guided to the frame area of said display panel; an image signal correcting section, and a driving section for driving the display elements of said display panel; light emitted from a normal display area of the display panel other than the display area end portion is emitted towards the outside of the display device without passing through the light guide element; characterized in that the display device further comprising: at least one photosensor provided on the display panel, the at least one photosensor being adapted to detect environment illuminance; and the image signal correcting section is configured to correct, in accordance with the environment illuminance detected by the at least one photosensor, an image signal of the image to be supplied to display elements included in the display area end portion where the light guide element is provided to thereby compensate a difference in at least one of luminance and color shift between the display of the image in the normal display area and the display area end portion, said difference being caused by said light guide element, and to output a result obtained by the correction as a corrected image signal; and in that the driving section is adapted to drive the display elements of the display panel included in the display area end portion where the light guide element is provided in accordance with the corrected image signal. a display panel having a display area in which a plurality of display elements for displaying an image are disposed in a matrix, wherein the display panel has a frame area in which no display element is provided and which is located at an end of the display panel; a light guide element provided in a display area end portion of the display panel so as to be located above the frame area, the light guide element being adapted to change a light path of the light emitted from display elements in said display area end portion of the display area so that part of the light is guided to the frame area of said display panel; an image signal correcting section, and a driving section for driving the display elements of said display panel; light emitted from a normal display area of the display panel other than the display area end portion is emitted towards the outside of the display device without passing through the light guide element; characterized in that the display device further comprising: at least one photosensor provided on the display panel, the at least one photosensor being adapted to detect environment illuminance; and the image signal correcting section is configured to correct, in accordance with the environment illuminance detected by the at least one photosensor, an image signal of the image to be supplied to display elements included in the display area end portion where the light guide element is provided to thereby compensate a difference in at least one of luminance and color shift between the display of the image in the normal display area and the display area end portion, said difference being caused by said light guide element, and to output a result obtained by the correction as a corrected image signal; and in that the driving section is adapted to drive the display elements of the display panel included in the display area end portion where the light guide element is provided in accordance with the corrected image signal. at least one photosensor provided on the display panel, the at least one photosensor being adapted to detect environment illuminance; and the image signal correcting section is configured to correct, in accordance with the environment illuminance detected by the at least one photosensor, an image signal of the image to be supplied to display elements included in the display area end portion where the light guide element is provided to thereby compensate a difference in at least one of luminance and color shift between the display of the image in the normal display area and the display area end portion, said difference being caused by said light guide element, and to output a result obtained by the correction as a corrected image signal; and in that the driving section is adapted to drive the display elements of the display panel included in the display area end portion where the light guide element is provided in accordance with the corrected image signal.