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US 8,941,143 B2Granted
Lighting elements
AssigneeCambridge Display Technology Limited
InventorEuan Smith
Life of this patent
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AssigneeCambridge Display Technology Limited
InventorEuan Smith
Estimating the term…
An OLED lighting element comprises a substrate bearing an OLED structure extending laterally over said substrate and sandwiched between first and second electrode layers. The first electrode layer defines a plurality of electrically conductive tracks and said second electrode layer comprises a substantially continuous electrically conducting layer. The OLED lighting element has an electrical bus-bar connected to said electrically conductive tracks extending substantially completely along the or each lateral edge of said lighting element. The electrically conductive tracks run in a radial direction from a laterally central location within said lighting element towards said bus-bar along said lateral edges of said lighting element. A said track subdivides into a plurality of tracks with increasing distance from said central location. This arrangement makes more efficient use of the conductive tracks.
An LED lighting element comprising a substrate bearing an LED structure extending laterally over said substrate and sandwiched between first and second electrode layers, wherein said first electrode layer defines a plurality of electrically conductive tracks and said second electrode layer comprises a substantially continuous electrically conducting layer, said LED lighting element having an electrical busbar connected to said electrically conductive tracks, said busbar extending substantially completely along the or each lateral edge of said lighting element, wherein said tracks run generally radially from a central location within said lighting element towards said busbar, wherein a said track subdivides into a plurality of tracks with increasing distance from said central location, and wherein an average sheet conductance of said first electrode layer in a radial direction from said central location varies according to a current density in said second electrode layer.
An LED lighting element comprising a substrate bearing an LED structure extending laterally over said substrate and sandwiched between first and second electrode layers, wherein said first electrode layer defines a plurality of electrically conductive tracks and said second electrode layer comprises a substantially continuous electrically conducting layer, said LED lighting element having a first electrical busbar connected to said electrically conductive tracks, said first busbar extending along a first lateral edge of said lighting element, said lighting element having a second electrical busbar connected to said second electrode layer and extending along a second lateral edge of said lighting element, wherein a direction of current flow from said first electrical busbar towards said second electrical busbar defines a longitudinal direction, wherein said tracks extend away from said first busbar, wherein an average sheet conductance of said first electrode layer across a width of said lighting element perpendicular to said longitudinal direction varies in said longitudinal direction to decrease with increasing distance from said first busbar, and wherein a number of said tracks across said width decreases with increasing distance from said first busbar.
Dependencies are inferred from the claim text.