Patent ID: 7629062

Claim:
A simple matrix display device having a plurality of scanning lines and information lines comprising: (a) 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 a plurality of light emission center materials included in the light-emitting layer, the pair of electrodes being formed at the position where the scanning line and the information line cross; (b) a driver for driving the organic light-emitting elements, wherein at least one of the light emission center materials is 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 materials, and wherein the light emission center materials comprise 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; and (c) a color filter.