White light LED with multicolor light-emitting layers of macroscopic structure widths, arranged on a light diffusing glass
First Claim
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1. An electroluminescent light emission device suitable for use as a white light source, comprising:
- a transparent substrate formed as a diffusing screen;
at least one first transparent electrode layer applied to the substrate;
a plurality of electroluminescent light emitter layers arranged laterally next to one another on the at least first transparent electrode layer and from whose emission radiation white light can be generated by additive color mixing;
at least one second electrode layer applied to the plurality of light emitter layers;
the lateral extent and/or a lateral distance of the light emitter layers amounting to at least 100 μ
m; and
the diffusing screen being an opal glass screen or a plastic substrate with embedded scattering centers and its thickness being a multiple of the average scattering length of the radiation beams to be mixed of the light emitter layers and being at least as large as the distance between the light emitter layers, wherebythe radiation beams emitted by the light emitter layers are at least partly superposed on a light exit surface of the substrate.
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Abstract
In a white light LED, multicolor-emitting light emitter layers of macroscopic structure widths, whose emission spectra can be mixed to form white light, are arranged laterally next to one another on a first transparent electrode layer. The light emitter layers are preferably in strip form and have, for the purpose of simplifying production, macroscopic dimensions that can be resolved by the eye. The thickness of a light-scattering substrate is chosen such that the radiation beams emitted by the light emitter layers are at least partly superposed on the light exit surface of the light-scattering substrate, thereby creating the optical impression of a white light source.
39 Citations
12 Claims
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1. An electroluminescent light emission device suitable for use as a white light source, comprising:
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a transparent substrate formed as a diffusing screen; at least one first transparent electrode layer applied to the substrate; a plurality of electroluminescent light emitter layers arranged laterally next to one another on the at least first transparent electrode layer and from whose emission radiation white light can be generated by additive color mixing; at least one second electrode layer applied to the plurality of light emitter layers; the lateral extent and/or a lateral distance of the light emitter layers amounting to at least 100 μ
m; andthe diffusing screen being an opal glass screen or a plastic substrate with embedded scattering centers and its thickness being a multiple of the average scattering length of the radiation beams to be mixed of the light emitter layers and being at least as large as the distance between the light emitter layers, whereby the radiation beams emitted by the light emitter layers are at least partly superposed on a light exit surface of the substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification
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Current AssigneeNovaled AG
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Original AssigneeNovaled GmbH
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InventorsLeo, Karl
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Primary Examiner(s)Patel; Nimeshkumar D.
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Assistant Examiner(s)Quarterman; Kevin
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Application NumberUS10/489,173Publication NumberTime in Patent Office1,579 DaysField of Search313/498, 313502-504, 313/506, 313/512, 313/113US Class Current313/504CPC Class CodesH01L 25/0753 the devices being arranged ...H01L 27/153 in a repetitive configurati...H01L 2924/00 Indexing scheme for arrange...H01L 2924/0002 Not covered by any one of g...H10K 50/125 specially adapted for multi...H10K 50/854 comprising scattering meansH10K 59/35 comprising red-green-blue [...
