Electronic device

An electronic device, which is able to be operated with a first state and a second state, the electronic device comprising:

• a substrate, wherein when the electronic device is extended along a direction from the first state to the second state, the substrate has a first width in the first state in the direction and a second width in the second state in the direction, and the second width is greater than the first width;
• and
• a plurality of light emitting units disposed on the substrate, wherein the plurality of light emitting units can be in a mode of ON, the plurality of light emitting units being in the mode of ON in a number of N1 while in the first state, and the plurality of light emitting units being in the mode of ON in a number of N3 while in the second state, wherein N3>N1,
• wherein the electronic device has a PPA_1 that is defined as a number of the plurality of light emitting units being in the mode of ON per unit area of the substrate while in the first state, and a PPA_2 that is defined as a number of the plurality of light emitting units being in the mode of ON per unit area of the substrate while in the second state, wherein 1.5×PPA_1≥PPA_2 ≥0.5×PPA_1.