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Driving circuit for stacked organic light emitting devices

  • US 5,757,139 A
  • Filed: 02/03/1997
  • Issued: 05/26/1998
  • Est. Priority Date: 02/03/1997
  • Status: Expired due to Fees
First Claim
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1. A circuit for driving a stacked organic light emitting device (SOLED) which includes a first and a second light emitting device, the first light emitting device including a first electrode arranged on a substrate, a first set of organic layers arranged on the first electrode and a second electrode arranged on the first set of organic layers, the second light emitting device including a second set of organic layers arranged on the second electrode and a third electrode arranged on the second set of organic layers, wherein the first electrode is coupled to a reference potential, the circuit comprising:

  • a first driver with an output coupled to the second electrode and an input coupled to a first control signal, wherein the first driver generates at its output a first drive voltage in accordance with the first control signal so as to control a brightness of a light emitted by the first light emitting device; and

    a second driver with an output coupled to the third electrode and an input coupled to the output of the first driver and to a second control signal, wherein the second driver generates at its output a second drive voltage in accordance with a sum of the second control signal and the first drive voltage so as to control a brightness of a light emitted by the second light emitting device.

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