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US 5,965,901 AGranted
Electroluminescent devices with voltage drive scheme
AssigneeCambridge Display Technology Limited
InventorsStephen Karl Heeks, Hermann Felix Wittmann
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Abstract
A light-emissive polymer device comprising: an anode; a cathode; a conjugated light-emissive polymer layer located between the anode and the cathode; and a driver for applying a voltage drive scheme between the anode and the cathode of a pattern having a relatively high voltage portion which causes the polymer layer to emit light and a relatively low voltage portion during which substantially no light is emitted by the polymer layer.
Claims22
A light-emissive polymer device comprising:
- an anode;
- a cathode;
- a conjugated light-emissive polymer layer located between the anode and the cathode;
- and
- a driver for applying a voltage drive scheme between the anode and the cathode of a pattern having a relatively high voltage portion which causes the polymer layer to emit light and a relatively low voltage portion during which substantially no light is emitted by the polymer layer, the relatively low voltage portion including at least two constant voltage portions, having different voltage levels.
2 more elements
An organic light-emissive device comprising:
- an anode;
- a cathode;
- an organic light-emissive layer located between the anode and the cathode;
- and
- a driver For applying a voltage drive scheme between the anode and the cathode of a pattern having a positive voltage portion which causes the organic layer to emit light, a negative voltage portion of substantially constant voltage, during which substantially no light is emitted by the organic layer, and a portion of substantially zero voltage during which substantially no light is emitted by the organic layer.
2 more elements
A method of operating a light emissive device, comprising:
- applying a relatively high voltage across an anode and a cathode having a conjugated light-emissive polymer material electrically connected therebetween, causing the polymer material to emit light;
- applying a first relatively low voltage, of insufficient voltage to cause the polymer material to emit light, across the anode and cathode;
- and
- applying a second relatively low voltage, of insufficient voltage to cause the polymer material to emit light and different from the first relatively low voltage, across the anode and cathode;
- wherein the first and second relatively low voltages are each substantially constant.
2 more elements
Dependencies are inferred from the claim text.