1. A display device comprising:a display panel in which display pixels including colored pixels of a plurality of colors are arranged;
an illumination device including a light source and configured to illuminate the display panel with light; and
a control substrate configured to control drive of the display pixels,
wherein the control substrate includes:
a display data generation circuit configured to generate display data for driving the display pixels, based on image data supplied from an external image signal supply source;
a detection circuit configured to detect a change in luminance light modulation data for modulating luminance of the light source, supplied from an external image signal supply source; and
a display data correction circuit configured to correct the display data, based on an output value of the detection circuit.