A driver circuit comprises a p-channel transistor and an n-channel transistor
connected
as a complementary pair of transistors to provide analog control of the drive current
for a current driven clement, preferably an organic electroluminescent element
(OEL element). The transistors, being of opposite channel, compensate, for any
variation in threshold voltage VT and therefore provide a drive
current to the OEL element which is relatively independent of VT.
The complementary pair of transistors can be applied to either voltage driving
or current driving pixel driver circuits.
