Patent ID: 8890860
Filing Date: 2014-11-18
Classification: G02B,G09G,H01L,H04N

Abstract:
1. An EL display device comprising: a first capacitor; a first transistor comprising: wherein the first transistor is turned on by a selection signal from the scan line during a first period so that an image signal from the signal line is held in the first capacitor; a second capacitor; a second transistor comprising: wherein the second transistor is turned on by a first control signal during a second period so that the image signal held in the first capacitor is held in the second capacitor, a third transistor comprising: a fourth transistor comprising: wherein the fourth transistor is turned on by a second control signal during a third period, and wherein the third period overlaps the first period, and a light-emitting element comprising: wherein the light-emitting element emits light in accordance with the same current that flows through the second terminal of the third transistor and the second terminal of the fourth transistor.