Circuit arrangement for ac driving of organic diodes
AssigneeKoninklijke Philips Electronics N.V.
InventorsDietrich Bertram, Hans-Helmut Bechtel
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Abstract
Organic light emitting devices emit light when operated with low dc voltage forward bias. According to the present invention, a space saving circuit arrangement of organic light emitting devices is disclosed, the circuit arrangement emitting light on both the positive and the negative cycle of an ac driving voltage. Furthermore a method is disclosed for producing the circuit arrangement on a substrate. Advantageously, the present invention allows for high voltage ac driving of organic light emitting devices or organic diodes without the need of additional rectifying electronics.
Claims10
Circuit arrangement of organic diodes, comprising:
- a first organic diode;
- a second organic diode;
- wherein the organic diodes are electrically contacted to electrodes such that:
- on a positive cycle of an ac driving voltage, the first organic diode is operated in forward direction and the second organic diode is reversely biased;
- and on a negative cycle of the ac driving voltage, the first organic diode is reversely biased and the second organic diode is operated in a forward direction.
Method for producing a circuit arrangement of organic light emitting devices, wherein the circuit arrangement is arranged on a substrate, the method comprising the steps of:
- depositing a first layer on a structured electrode, the layer comprising α-NPD;
- depositing a second layer on the first layer, the second layer comprising CBP:FIrpic;
- depositing a layer third layer on the second layer, the third layer comprising BAlq;
- depositing a fourth layer on the third layer, the fourth layer comprising Bphen:
- Cs;
- depositing a fifth layer on the fourth layer, the fifth layer comprising Ag;
- depositing a sixth layer on the fifth layer, the sixth layer comprising α-NPD;
- depositing a seventh layer on the sixth layer, the seventh layer comprising CBP:FIrpic;
- depositing an eighth layer on the seventh layer, the eighth layer comprising BAlq;
- depositing a ninth layer on the eighth layer, the ninth layer comprising Bphen:
- Cs;
- depositing a tenth layer on the ninth layer, the tenth layer comprising Al;
- and
- electrically contacting the organic light emitting devices formed with the first to tenth layer to first and second electrodes.
Method for producing a circuit arrangement of organic light emitting devices, wherein the circuit arrangement is arranged on a transparent substrate, the substrate comprising a structured electrode, the method comprising the steps of:
- depositing a first layer on the structured electrode, the first layer comprising PDOT;
- depositing a second layer on the first layer, the second layer comprising a light emissive polymer, preferably the light emissive polymer is PPV;
- depositing a third layer on the second layer, the third layer being structured and comprising Ba;
- depositing a fourth layer on the third layer, the fourth layer being structured and comprising Al;
- and
- electrically contacting the organic light emitting devices formed with the first to fourth layers to first and second electrodes.
Dependencies are inferred from the claim text.