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Drive circuit to be used in active matrix type light-emitting element array

  • US 6,777,888 B2
  • Filed: 09/20/2002
  • Issued: 08/17/2004
  • Est. Priority Date: 03/21/2001
  • Status: Expired due to Fees
First Claim
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1. 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.

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