Manufacturing method for organic EL lighting device
Anodes of a plurality of organic EL elements are connected together. A forward bias voltage relative to the potential of anodes and a reverse bias voltage are alternately applied to cathodes of the plurality of organic EL elements at a predetermined period. The ratio of the time for which the reverse bias voltage is applied and the time for which the forward bias voltage is applied is increased.
1. A manufacturing method for an organic EL lighting device using a plurality of organic EL elements, comprising:
an application step that connect anodes of said plurality of organic EL elements together and alternately applies a forward bias voltage relative to the potential of said anodes and a reverse bias voltage to cathodes of said plurality of organic EL elements at a predetermined period; and
an increase step that increases the ratio of the time for which said reverse bias voltage is applied and the time for which said forward bias voltage is applied.
2. The manufacturing method as set forth in claim 1 ,
wherein said increase step is performed by successively increasing said ratio of the time for which said reverse bias voltage is applied and the time for which said forward bias voltage is applied.
3. The manufacturing method as set forth in claim 1 ,
wherein said increase step is performed by increasing said ratio of the time for which said reverse bias voltage is applied and the time for which said forward bias voltage is applied step by step.
4. The manufacturing method as set forth in claim 1 ,
wherein said application step is performed by applying said forward bias voltage to the cathodes of a half of said plurality of organic EL elements and applying said reverse bias voltage to the cathodes of the other half of said plurality of organic EL elements.
5. The manufacturing method as set forth in claim 4 ,
wherein said application step is performed by connecting cathodes on each row of said plurality of organic EL elements arranged in a matrix shape together and applying said forward bias voltage and said reverse bias voltage to the cathodes on the respective adjacent rows.
6. The manufacturing method as set forth in claim 4 ,
wherein said application step is performed by connecting cathodes of each column of said plurality of organic EL elements arranged in a matrix shape together and applying said forward bias voltage and said reverse bias voltage to the cathodes on the respective adjacent columns.
7. The manufacturing method as set forth in claim 1 , further comprising:
another application step that applies a predetermined voltage to the anodes connected together.
8. The manufacturing method as set forth in claim 1 , further comprising:
a grounding step that grounds the anodes connected together.
9. The manufacturing method as set forth in claim 1 ,
wherein said increase step is performed by increasing said reverse bias voltage.
10. The manufacturing method as set forth in claim 1 ,
wherein each organic EL element comprises:
a glass substrate;
a transparent indium-tin-oxide electrode that is the anode;
a hole injection layer;
a hole transporting layer;
the cathode;
a light emission layer that emits light upon application of a predetermined voltage between the transparent electrode and the cathode;
an electron transporting layer;
an electron injection layer;
a sealing agent; and
a sealing substrate.
11. The manufacturing method as set forth in claim 1 ,
wherein portions prone to short circuits are automatically repaired.