Electroluminescent panel provided with light extraction elements
OwnerValter Drazic, Christophe Feryinventors
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Abstract
Display comprising a substrate 1 carrying: an electroluminescent organic layer partitioned into electroluminescent cells 21 and inserted between two electrode layers of which one is transparent and the other opaque, a layer 3 of light extractors operating by reflection, each extractor 31 being made of transparent material and comprising an entry interface 32, an exit interface 33 and reflecting side walls 34, where the electroluminescent layer region of each cell 21 is optically coupled to a plurality of extractors 31. The light extraction efficiencies are improved while limiting the constraints on manufacturing and keeping the display thickness limited.
Claims7
Lighting or image display panel comprising a substrate carrying:
- an electroluminescent organic layer partitioned into electroluminescent cells and inserted between two electrode layers of which one is transparent and the other opaque, each cell corresponding to a region covering one electrode of each layer,
- a layer of light extractors operating by reflection, each extractor being made from transparent material and comprising a light entry interface optically coupled to the electroluminescent layer via the said transparent electrode layer, a light exit interface directed towards the outside of the display panel, and side walls forming reflecting optical interfaces for the light propagating within the extractor and a closed reflecting surface,
- where the electroluminescent layer region of each cell is optically coupled to a plurality of extractors, wherein, for each extractor, the surface of said light exit interface is superior to the surface of said light entry interface.
Dependencies are inferred from the claim text.