Light source comprising light-emitting clusters
AssigneeKoninklijke Philips Electronics N.V.
InventorsVladimir Draganov, Marc Salsbury
Life of this patent
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Abstract
The present invention provides a light source for producing a substantially balanced output at a substantially optimised output intensity. In one embodiment, the light source comprises one or more light-emitting clusters of a first type and one or more light-emitting clusters of one or more other types, each one of which comprising one or more light-emitting elements, such that, when all light-emitting elements are driven to provide a substantially optimised output intensity, the spectral output of the one or more light-emitting clusters of the first type is substantially balanced by the spectral output of the one or more other light-emitting clusters.
Claims26
A light source for producing a spectral output at an output intensity, the light source comprising:
- one or more light-emitting clusters of a first type, each one of which comprising a first combination of one or more light-emitting elements in each of at least a first, a second and a third colour;
- one or more light-emitting clusters of a second type, each one of which comprising a second combination of one or more light emitting elements in one or more of said first, said second and said third colour, and wherein each of said light-emitting clusters of said second type comprises one or more light-emitting elements in each of said first, said second and said third colour;
- and
- a driving element for driving said light-emitting clusters;
- wherein, when driven at the output intensity, the spectral output is provided by a combined spectral output of said one or more light-emitting clusters of said first type and said one or more light-emitting clusters of said second type.
A light source for producing a spectral output at an output intensity, the light source comprising:
- one or more light-emitting clusters of a first type, each one of which comprising a first combination of one or more light-emitting elements in each of at least a first, a second and a third colour;
- one or more light-emitting clusters of a second type, each one of which comprising a second combination of one or more light emitting elements in one or more of said first, said second and said third colour,
- one or more light-emitting clusters of a third type,
- a driving element for driving said light-emitting clusters;
- wherein, when driven at the output intensity, the spectral output is provided by a combined spectral output of said one or more light-emitting clusters of said first type and said one or more light-emitting clusters of said second type, and
- wherein each one of said light-emitting clusters of said third type comprises a third combination of one or more light-emitting elements in one or more of said first, said second and said third colour.
A light source for producing a spectral output at an output intensity, the light source comprising:
- one or more light-emitting clusters of each of a first type and of one or more other types;
- and
- a driving element for driving said one or more light-emitting clusters of said first type and of said one or more other types;
- each cluster of said first type comprising one or more light-emitting elements in each of at least a first, a second and a third colour having respective output efficiencies, wherein one or more of said respective output efficiencies are lower than one or more others of said respective output efficiencies;
- and
- each cluster of said one or more other types comprising one or more light-emitting elements selected to compensate for said one or more lower respective output efficiencies such that, when driven to provide the output intensity, a spectral output of said one or more light-emitting clusters of said first type is substantially balanced by a spectral output of said one or more light-emitting clusters of said one or more other types.
Dependencies are inferred from the claim text.