Patent ID: 6777888
Filing Date: 2004-08-17
Classification: G09G

Abstract:
A drive circuit to be used in an active matrix type light-emitting element array comprising scan lines and signal lines arranged on a substrate to form a matrix and unit pixels formed near the respective crossings of the scan lines and the signal lines, each unit pixel including a light-emitting element and a plurality of thin film transistors each having a source electrode, a gate electrode and a drain electrode, said drive circuit comprising:a first circuit section including a first thin film transistor (M1) having a gate electrode connected to a scan line, a source electrode connected to a signal line and a drain electrode; a second circuit section including a light-emitting element having an electrode connected to a first power source and a second thin film transistor (M2) having a gate electrode, a source electrode connected to a second power source and a drain electrode connected to another electrode of the light-emitting element, hence said light-emitting element being connected in series to said second thin film transistor; and a third circuit section including a third thin film transistor (M3) having a gate electrode connected to a control signal line, a source electrode connected to a reference power source and a drain electrode connected to the gate electrode of said second thin film transistor; the drain electrode of said first thin film transistor being connected to the gate electrode of said second thin film transistor by way of a memory capacitance (C1); the drain electrodes of said first and second thin film transistors being commonly connected.