A display device, comprising: a display panel which includes a plane area and at least one curved area (111, 111a, 111b, 111c) disposed outside and adjacent to the plane area; a timing controller configured to use an image signal to generate image data; and a data driver configured to use the image data to output a data voltage (Vdata) to a plurality of pixels disposed in the plane area and a plurality of pixels disposed in the at least one curved area, wherein the timing controller includes: an image analyzing unit configured to separate, extract and analyze a portion of the image signal (VS curved) corresponding to the at least one curved area; a luminance control unit configured to increase the luminance of the at least one curved area (111,111a, 111b, 111c) such that a front luminance in a front direction among components of the luminance of the at lest one curved area (111, 11a, 11b, 111c) is equal to the luminance of the plane area; wherein the image analyzing unit is configured to analyze the portion of the image signal (VS curved) corresponding to the at least one curved area (111, 111a, 111b, 111c) to calculate a predicted luminance of the at least one curved area and determine whether to increase the luminance of the at least one curved area by calculating a mean square of the predicted luminance of the at least one curved area, comprising determining whether the mean square of the predicted luminance is equal to or higher than a predetermined value, and if so, determining that the luminance of the at least one curved area is increased; and wherein the luminance control unit is configured to control the portion of the image signal corresponding to the at least one curved area to increase the luminance of the at least one curved area when it is determed that the luminance of the at least one curved area is increased. a display panel which includes a plane area and at least one curved area (111, 111a, 111b, 111c) disposed outside and adjacent to the plane area; a timing controller configured to use an image signal to generate image data; and a data driver configured to use the image data to output a data voltage (Vdata) to a plurality of pixels disposed in the plane area and a plurality of pixels disposed in the at least one curved area, wherein the timing controller includes: an image analyzing unit configured to separate, extract and analyze a portion of the image signal (VS curved) corresponding to the at least one curved area; a luminance control unit configured to increase the luminance of the at least one curved area (111,111a, 111b, 111c) such that a front luminance in a front direction among components of the luminance of the at lest one curved area (111, 11a, 11b, 111c) is equal to the luminance of the plane area; wherein the image analyzing unit is configured to analyze the portion of the image signal (VS curved) corresponding to the at least one curved area (111, 111a, 111b, 111c) to calculate a predicted luminance of the at least one curved area and determine whether to increase the luminance of the at least one curved area by calculating a mean square of the predicted luminance of the at least one curved area, comprising determining whether the mean square of the predicted luminance is equal to or higher than a predetermined value, and if so, determining that the luminance of the at least one curved area is increased; and wherein the luminance control unit is configured to control the portion of the image signal corresponding to the at least one curved area to increase the luminance of the at least one curved area when it is determed that the luminance of the at least one curved area is increased. an image analyzing unit configured to separate, extract and analyze a portion of the image signal (VS curved) corresponding to the at least one curved area; a luminance control unit configured to increase the luminance of the at least one curved area (111,111a, 111b, 111c) such that a front luminance in a front direction among components of the luminance of the at lest one curved area (111, 11a, 11b, 111c) is equal to the luminance of the plane area; wherein the image analyzing unit is configured to analyze the portion of the image signal (VS curved) corresponding to the at least one curved area (111, 111a, 111b, 111c) to calculate a predicted luminance of the at least one curved area and determine whether to increase the luminance of the at least one curved area by calculating a mean square of the predicted luminance of the at least one curved area, comprising determining whether the mean square of the predicted luminance is equal to or higher than a predetermined value, and if so, determining that the luminance of the at least one curved area is increased; and wherein the luminance control unit is configured to control the portion of the image signal corresponding to the at least one curved area to increase the luminance of the at least one curved area when it is determed that the luminance of the at least one curved area is increased.