Patent ID: 8836689
Filing Date: 2014-09-16
Classification: G09G

Abstract:
1. A display device comprising: a light-emitting element; an n-channel driving transistor; a capacitor; a constant current source; a first switch; a second switch; and a third switch, wherein one terminal of the first switch is electrically connected to a gate of the n-channel driving transistor and the other terminal of the first switch is electrically connected to one electrode of the capacitor, wherein one terminal of the second switch is electrically connected to a source of the n-channel driving transistor, and the other terminal of the second switch is electrically connected to an anode of the light-emitting element, wherein one terminal of the third switch is electrically connected to the source of the n-channel driving transistor and the other electrode of the capacitor, and the other terminal of the third switch is electrically connected to the constant current source, wherein in a writing period, the first switch and the second switch are off, the third switch is on, the n-channel driving transistor is operated in a saturation region, an image signal is input to the one electrode of the capacitor, and a potential which has substantially the same level as a potential of the source of the n-channel driving transistor is input to the other electrode of the capacitor, and wherein in a display period after the writing period, the first switch and the second switch are on, the third switch is off, a node where the one electrode of the capacitor and the gate of the n-channel driving transistor are electrically connected to each other is made in a floating state, and a voltage which has substantially the same level as a difference between the image signal and the potential of the source of the n-channel driving transistor in the writing period is kept as a voltage between the gate and the source of the n-channel driving transistor.