Patent ID: 8217878

Claim:
A display device, comprising: a set of pixels in a matrix state, a first power line of a set of first power lines and a second power line of a set of second power lines supplying power to a pixel of the set of pixels, wherein the pixel comprises: a light emitting element; a drive transistor; and a pixel capacitor, wherein the drive transistor and the light emitting element connect in series between the first power line and a ground line, wherein the pixel capacitor connect a source and a gate of the drive transistor, wherein the drive transistor allows a drive current to flow in the light emitting element according to a signal potential stored in the pixel capacitor, wherein the drive current is fed back negatively to the pixel capacitor when a source potential of the drive transistor becomes higher than a threshold voltage of the drive transistor, and wherein the drive transistor has a size ratio W/L of 0.5 or more where W is a channel width and L is a channel length.