Patent ID: 8232931

Claim:
A drive circuit for an organic light omitting diode (OLED) in a pixel array comprising: input voltage signal receiving means, output voltage signal generating means operably connected to the pixel diode, and means for processing said input voltage signal to replicate the inverse IV characteristic of the pixel diode, to form said output voltage signal; wherein said processing means comprises first means for converting said input voltage signal into an output current; and wherein said processing means further comprises second means operably connected to receive said output current from said first means and for converting same into said output voltage signal, said second means comprising a reference diode, means for applying a current proportional to said input voltage signal to said reference diode and means for applying said output voltage signal to the pixel diode, said means for applying a current proportional to said input voltage signal to the pixel diode comprising a transistor having a gate and an output circuit, said gate being adapted to receive said output current from said first means, said output circuit of said transistor being operably connected to said reference diode through a node such that said output voltage signal appears at said node.