In one aspect, the display device includes a display unit including a plurality of pixels connected to scan lines, light emission control lines, and data lines, where each pixel is configured to emit light with a driving current corresponding to image data signals transmitted through the data lines based on light emission control signals transmitted through the light emission control lines. Each of the pixels includes subpixels, each configured to display one of a plurality of colors. The device also includes a controller configured to convert external video signals to image data signals, output the converted signals to a data driver, generate light emission driving control signals for controlling the light emission duty ratio of the light emission control signals, and calculate the pixel-on-ratio for each subpixel to reduce the driving current.