Patent ID: 6992663

Claim:
A driving circuit of an active matrix type light-emitting element, the driving circuit comprising: scanning lines and signal lines formed in a matrix on a substrate; first and second transistors; a constant current source; and a grounding potential at or near an intersection of one of the scanning lines and one of the signal lines; wherein the driving circuit has a circuit assembly comprised of (i) a first circuit having the light-emitting element and the first transistor connected in series, and (ii) a second circuit comprised of the second transistor and connected in parallel to the first circuit, wherein the constant current source, the circuit assembly, and the grounding potential are connected in series, wherein the connecting constitution of the driving circuit is characterized in that a first main electrode of the first transistor and a first main electrode of the second transistor are connected in common to one electrode of the constant current source, that the other electrode of the constant current source is connected to the grounding potential, that the cathode of the light-emitting element is connected to a second main electrode of the first transistor, and that the anode of the light-emitting element and a second main electrode of the second transistor are connected in common to a power line, and wherein the driving circuit further comprises a first memory circuit comprised of (i) a third transistor having a control electrode connected to the one of the scanning lines and a first main electrode connected to the one of the signal lines and (ii) a memory capacitance one electrode of which is connected to the grounding potential, with a second main electrode of the third transistor being connected in common to the memory capacitance and a control electrode of the first transistor.