| abstract |
A display device having a first light-emitting element, a second light-emitting element, a constant current source, and an amplifier is provided. Each of the first light-emitting element and the second light-emitting element has a first layer including an organic compound and an inorganic compound and a second layer including a light-emitting substance, which are stacked between a pair of electrodes. The first layer is provided over the second layer. Alternatively, the second layer is provided over the first layer. |