Display device and control method

A display device comprising:

• a display panel having a display area;
• a light guide having a side surface, and a main surface facing the display panel;
• a light source unit facing the side surface and emitting light toward the light guide;
• and
• a controller controlling the light source unit, wherein
• the light source unit includes a plurality of first light emitting elements arranged along the side surface to emit light of the same color, and
• when a period from the time when the light source unit is turned on until the time when the light source unit is turned on again is referred to as one cycle, the controller controls a lighting time per one cycle of one first light emitting element which is located farther from a center of the side surface, of two adjacent first light emitting elements, to be shorter than a lighting time per one cycle of the other first light emitting element.