Display device with improved luminance

A display device comprising:

• a display unit having pixels arranged in a two-dimensional matrix, each pixel including additive mixture subpixels and a luminance adjustment subpixel;
• and
• a signal control unit configured to control a luminance at a maximum gray scale in the luminance adjustment subpixel, the signal control unit including:
• a photo sensor configured to produce a photo output based on an external light illuminance, and
• a signal control circuit comprising:
• a first converting circuit configured to generate video signals for driving the additive mixture subpixels, the video signals being set corresponding to gray scales of input signals;
• and
• a second converting circuit configured to generate an adjustment pixel video signal for driving the luminance adjustment subpixel, the adjustment pixel video signal being generated according to the photo output from the photo sensor,
• wherein only the luminance at the maximum gray scale in the luminance adjustment subpixel is controlled depending on the external light illuminance, and
• wherein the signal control unit is configured to control the luminance in the luminance adjustment subpixel independently of the additive mixture subpixels.