Strengthened counter electrode of electroluminescent devices
AssigneeKoninklijke Philips N.V.
InventorHerbert F. Boerner
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Abstract
The present invention provides an electroluminescent device comprising a substrate (1) and stacked thereon in the order of mention a first transparent electrode (2), an electroluminescent stack (3), and a second electrode (4). Furthermore, the electroluminescent device comprises at least one additional hard layer (5) that is located underneath the second electrode and/or on top of the second electrode and that has a hardness larger than the hardness of the second electrode. Methods for the production of such electroluminescent devices are likewise provided.
Claims14
An electroluminescent device comprising:
- a substrate, and stacked thereon in the order of mention, a first transparent electrode, an electroluminescent stack, and a second electrode;
- at least one hard layer that is located directly on top of the second electrode;
- and an encapsulating conductive layer that directly contacts the second electrode in places that are not covered by the hard layer, wherein at least a portion of the second electrode is not overlaid with said encapsulating conductive layer;
- a cover;
- and
- a contact that provides an electrical connection directly between the cover and the encapsulating conductive layer, the contact comprising:
- a conductive glue that is in direct contact with the encapsulating conductive layer;
- and
- a conductive spacer that it is in direct contact with the conductive glue and the cover
- wherein the hard layer has a hardness larger than the hardness of the second electrode.
An electroluminescent device, comprising:
- a substrate, and stacked thereon in the order of mention, a first transparent electrode, an electroluminescent stack, and a second electrode;
- at least one hard layer that is located directly on top of the second electrode;
- an encapsulating conductive layer that encapsulates the at least one hard layer and that directly contacts the second electrode in places that are not covered by the hard layer;
- a cover;
- and
- at least one contacting means comprising:
- a conductive glue that is applied directly to the encapsulating conductive layer;
- and
- a conductive spacer that directly contacts the conductive glue and the cover means,
- wherein the additional hard layer has a hardness larger than the hardness of the second electrode.
An electroluminescent device comprising:
- a substrate, and stacked thereon in the order of mention, a first transparent electrode, an electroluminescent stack, and a second electrode;
- at least one hard layer that is located directly on top of the second electrode;
- and an encapsulating conductive layer that directly contacts the second electrode in places that are not covered by the hard layer, and
- a contact directly connected to a top surface of said encapsulating conductive layer, wherein the area of direct connection between the contact and the encapsulating conductive layer is substantially smaller than the area of a top surface of the second electrode;
- wherein at least a portion of the second electrode is not overlaid with said encapsulating conductive layer,
- wherein the hard layer has a hardness larger than the hardness of the second electrode
- wherein the at least a portion said encapsulating conductive layer at least partially surrounds said second electrode.
Dependencies are inferred from the claim text.