A display device, comprising: a display panel comprising: a plurality of first color sub-pixels and a plurality of second color sub-pixels arranged in odd-numbered rows and columns, wherein the first color sub-pixels and the second color sub-pixels are alternately arranged within each odd-numbered row and column; and a plurality of third color sub-pixels arranged in each even-numbered column of each even-numbered row only and each of the third color sub-pixels is at a diagonal direction with respect to one of the first or second color sub-pixels; wherein the first color sub-pixels are configured to emit red light, the second color sub-pixels are configured to emit blue light, and the third color sub-pixels are configured to emit green light; a scan driver configured to drive scan lines (S1,... Sn) coupled to the first, second and third color sub-pixels and extending in a first direction; a data processor configured to receive first data and to generate second data based on the first data and the sub-pixel arrangement of the display panel; wherein the data processor is configured to generate the second data by sub-pixel rendering the first data according to the sub-pixel arrangement of the display panel, and reducing grayscale values of the first data to be supplied to the sub-pixels of the display panel arranged in at least one of each outermost row and each outermost column; wherein the data processor comprises a dimming unit configured to generate the second data, and the dimming unit is configured to decide whether the first data is data for a first line, a last line or other lines of the display panel; and a data driver configured to drive data lines (D1,...Dm) coupled to the first, second, and third color sub-pixels and extending in a second direction crossing the scan lines, with the second data. a plurality of first color sub-pixels and a plurality of second color sub-pixels arranged in odd-numbered rows and columns, wherein the first color sub-pixels and the second color sub-pixels are alternately arranged within each odd-numbered row and column; and a plurality of third color sub-pixels arranged in each even-numbered column of each even-numbered row only and each of the third color sub-pixels is at a diagonal direction with respect to one of the first or second color sub-pixels; wherein the first color sub-pixels are configured to emit red light, the second color sub-pixels are configured to emit blue light, and the third color sub-pixels are configured to emit green light; a scan driver configured to drive scan lines (S1,... Sn) coupled to the first, second and third color sub-pixels and extending in a first direction; a data processor configured to receive first data and to generate second data based on the first data and the sub-pixel arrangement of the display panel; wherein the data processor is configured to generate the second data by sub-pixel rendering the first data according to the sub-pixel arrangement of the display panel, and reducing grayscale values of the first data to be supplied to the sub-pixels of the display panel arranged in at least one of each outermost row and each outermost column; wherein the data processor comprises a dimming unit configured to generate the second data, and the dimming unit is configured to decide whether the first data is data for a first line, a last line or other lines of the display panel; and a data driver configured to drive data lines (D1,...Dm) coupled to the first, second, and third color sub-pixels and extending in a second direction crossing the scan lines, with the second data.