Patent ID: 7358942
Filing Date: 2008-04-15
Classification: F21V,G09G,H01L

Abstract:
1. A light emitting device comprising: a light emitting element formed over a substrate; a first transistor for determining a current value flowing in the light emitting element; a second transistor for selecting a light emission or non-emission of the light emitting element according to a video signal; a third transistor for controlling an input of the video signal; and a fourth transistor for bringing the light emitting element into a non-light emission state regardless of the video signal, wherein the light emitting element, the first transistor and the second transistor are connected in series between a first power supply and a second power supply, wherein a gate electrode of the first transistor and a gate electrode of the fourth transistor are each connected to a second scan line, and wherein the first transistor and the second transistor have a same polarity.