A display device is able to be operated with a first state and a second state, and the display device includes a substrate and a plurality of light emitting units. When the display device is extended along a stretched direction from the first state to the second state, the substrate has a first width in the first state and a second width in the second state. The second width is greater than the first width. The plurality of light emitting units are disposed on the substrate, and the plurality of light emitting units can be in a mode of ON or in a mode of OFF. The light emitting units being in the mode of ON are in a number of N1 while in the first state. The light emitting units being in the mode of ON are in a number of N3 while in the second state, and N3>N1.