Patent ID: RE43354

Claim:
A driving circuit for an electro-luminescence (EL) cell, comprising: an EL cell; a supply circuit selectively applying current to the EL cell based on a pixel signal from a data line, the supply circuit including a first transistor connected between the EL cell and a voltage supply line and a charge storage device storing a charge based on the pixel signal; and a control circuit controlling current flow from the supply circuit to the EL cell, the control circuit including a second transistor connected between the data line and the voltage supply line such that the first and second transistors form a current mirror, the first and second transistors having gates connected to the charge storage device. device; a third transistor connected between a data supply line and the second transistor, and a gate of the third transistor connected to a gate signal supply line; a first node connected between the third transistor and the second transistor; and a fourth transistor connected between the first node and the gate of the first transistor and between the first node and the gate of the second transistor, and a gate of the fourth transistor connected to the gate signal supply line.