Patent ID: 7189466

Claim:
An active matrix display device comprising: a plurality of organic light-emitting elements each comprising at least one light-emitting layer between a pair of electrodes formed on a substrate and at least two light emission center materials included in the light-emitting layer; and a thin film transistor for each of the organic light-emitting elements for driving the organic light-emitting elements, wherein at least one of the light emission center materials comprises a phosphorescent light-emitting material, and an excitation lifetime of the light emission center material that emits light having a shortest wavelength is shorter than an excitation lifetime of the other light emission center material, wherein the light emission center material comprises a blue emitting material, a green emitting material, and a red emitting material and an excitation lifetime τB of the blue emitting material, an excitation lifetime τG of the green emitting material, and an excitation lifetime τR of the red emitting material satisfy a relationship represented by τB<τR and τB<τG.