Display device and method for driving display device

A display device comprising:

• an image display panel having a display area in which display is controlled based on an image signal;
• a light source device configured to illuminate the image display panel with a plurality of light sources;
• and
• a controller configured to control a lighting amount of each of the light sources based on the image signal,
• wherein the display area includes a plurality of segment areas each illuminated by one or more of the light sources,
• wherein each of the segment areas includes a plurality of subsegment areas that are obtained by further dividing the segment area, and
• wherein the controller is configured to:
• calculate luminance required for each of the subsegment areas, based on the image signal for each of the subsegment areas;
• temporarily set luminance values of the respective segment areas for determining the lighting amounts of the light sources based on maximum luminance among the required luminance values of the respective subsegment areas included in each of the segment areas;
• and
• reset, based on at least the maximum luminance among the required luminance values of the respective subsegment areas included in each of the segment areas, the luminance value of at least the segment area adjacent to the corresponding subsegment area having the required luminance of the maximum luminance.