Patent ID: 7339317
Filing Date: 2008-03-04
Classification: H01L,Y10S

Abstract:
1. A light emitting device comprising: a pixel portion; a switching thin film transistor in the pixel portion; a current control thin film transistor in the pixel portion; at least an EL element electrically connected to the current control thin film transistor in the pixel portion; wherein the switching thin film transistor is an n-channel thin film transistor; wherein the current control thin film transistor is a p-channel thin film transistor; a first pixel including a first EL element for emitting a red light in the pixel portion; a second pixel including a second EL element for emitting a green light in the pixel portion; a third pixel including a third EL element for emitting a blue light in the pixel portion; wherein a triplet compound is used in the first EL element while a singlet compound is used in each of the second and third EL elements.