A display device for a vehicle, comprising: a self-luminous indicator which has a display screen with a plurality of light emitting pixel elements; a display control unit arranged to display information, on the display screen of the self-luminous indicator, wherein the image information according to first image information contains a first display portion for fixedly displaying a given display pattern, and a second display portion, which is formed in a different region from the first display portion and which has a lower brightness than the first display portion; characterized by: a display time measuring unit that is adapted to measure a display time of the self-luminous indicator; and a brightness adjusting unit that includes an adjustment gradation specifying unit that is adapted to specify, on the basis of the display time measured by the display time measuring unit, an alpha blending coefficient for the second display portion, in order to suppress the effect of non-uniform brightness deterioration occurring in the display screen on which the first and second display portions (G11,G12) are displayed, such that the first and second display portions (G11, G12) can be displayed with the same brightness, wherein the display control unit is configured to translucently combine the image information with transmissive image information in which a portion corresponding to the second display portion has a certain transparency according to said alpha blending coefficient, so as to obtain the brightness adjustment and to display the combined image on the display screen of the self-luminous indicator. a self-luminous indicator which has a display screen with a plurality of light emitting pixel elements; a display control unit arranged to display information, on the display screen of the self-luminous indicator, wherein the image information according to first image information contains a first display portion for fixedly displaying a given display pattern, and a second display portion, which is formed in a different region from the first display portion and which has a lower brightness than the first display portion; characterized by: a display time measuring unit that is adapted to measure a display time of the self-luminous indicator; and a brightness adjusting unit that includes an adjustment gradation specifying unit that is adapted to specify, on the basis of the display time measured by the display time measuring unit, an alpha blending coefficient for the second display portion, in order to suppress the effect of non-uniform brightness deterioration occurring in the display screen on which the first and second display portions (G11,G12) are displayed, such that the first and second display portions (G11, G12) can be displayed with the same brightness, wherein the display control unit is configured to translucently combine the image information with transmissive image information in which a portion corresponding to the second display portion has a certain transparency according to said alpha blending coefficient, so as to obtain the brightness adjustment and to display the combined image on the display screen of the self-luminous indicator. a display time measuring unit that is adapted to measure a display time of the self-luminous indicator; and a brightness adjusting unit that includes an adjustment gradation specifying unit that is adapted to specify, on the basis of the display time measured by the display time measuring unit, an alpha blending coefficient for the second display portion, in order to suppress the effect of non-uniform brightness deterioration occurring in the display screen on which the first and second display portions (G11,G12) are displayed, such that the first and second display portions (G11, G12) can be displayed with the same brightness, wherein the display control unit is configured to translucently combine the image information with transmissive image information in which a portion corresponding to the second display portion has a certain transparency according to said alpha blending coefficient, so as to obtain the brightness adjustment and to display the combined image on the display screen of the self-luminous indicator.