Display device and driving method thereof, display module, and portable information terminal

摘要

[Summary ][Problem] It is an object to provide a display device having a simple structure of a driver circuit for inputting a video signal to a pixel, high display quality of the intermediate gradation and low power consumption, and a driving method thereof. [Solving Means] Each of a plurality of pixels has a light emitting element and a capacitor. One electrode of the light emitting element is connected to the other electrode of the capacitor and one electrode of the light emitting element is applied to a voltage which is equal to or higher than a threshold voltage of the light emitting element and a potential of one electrode of the capacitor is changed. Therefore, a potential of one electrode of the light emitting element is changed and the light emitting element emits light.