The purpose of the present invention is to provide a light emitting device
using an organic light emitting element and allowed to be driven stably
with long lifetime. In a light emitting device having an organic light
emitting device provided with an organic compound layer for obtaining
light emission by applying a voltage between a first electrode and a
second electrode, and arrangements for applying a forward bias for
emitting light from the organic light emitting device and a reverse bias
of reverse polarity to the forward bias, the maximum voltage Vf of the
forward bias is higher than the maximum voltage Vr of the reverse bias in
an alternating current cycle formed of the forward bias and the reverse
bias. At this time, the Vr is preferably a quarter of the Vf or higher
than that. Additionally, the time Tr to apply the reverse bias in the
alternating current cycle is preferably equal to or longer than the time
Tf to apply the forward bias.
