Display device and terminal device

A display device comprising:

• a display region including a plurality of display pixels, the display region being configured to display an image in accordance with image data input from an external device;
• a plurality of dummy pixels disposed outside the display region;
• one or more light blocking films covering the plurality of dummy pixels on the side to be viewed;
• and
• a control circuit configured to control the display region and the plurality of dummy pixels,
• wherein the display region includes:
• a first region;
• and
• a second region having a lower display pixel density than the first region,
• wherein each of the plurality of dummy pixels is associated with a display pixel disposed in the second region,
• wherein each of the plurality of display pixel and the plurality of dummy pixels includes a light-emitting element that emits light in response to driving current, and
• wherein the control circuit is configured to:
• supply the display pixels in the second region with driving current higher than driving current for the display pixels in the first region for a same grayscale level specified in image data;
• supply each of the plurality of dummy pixels with a same data signal as a data signal for the associated display pixel in the second region;
• measure deterioration of the light-emitting element of each of the plurality of dummy pixels;
• and
• adjust data signals for the display pixels in the second region associated with the plurality of dummy pixels based on results of the measurement.