A display device includes a detecting drive unit, an air cleanliness detecting unit and an air cleanliness indicating unit. The air cleanliness detecting unit is configured to detect air cleanliness under the driven of the detecting drive unit and to transmit a detecting result to the air cleanliness indicating unit. The air cleanliness indicating unit is configured to indicate the air cleanliness based on the detecting result of the air cleanliness detecting unit. The display device of the disclosure can conveniently detect the air cleanliness so that a user can live more healthily.