Display device and operation method thereof

A method of operating a display device, the display device comprising a display panel, the method comprising:

• emitting first light using a first pixel set disposed in a first part of the display panel;
• receiving second light using a first sensor set disposed in a second part of the display panel when the first pixel set emits the first light;
• generating a sensing signal using the first sensor set and the second light;
• calculating a dust concentration by at least one of a processor, a driving controller, and a readout circuit of the display device based on the sensing signal;
• and
• displaying an image that includes information related to the dust concentration on the display panel,
• wherein the readout circuit including at least a readout line to transmit the sensing signal is electrically connected to at least one of the driving controller and the first sensor set and receives the sensing signal.