| CPC A61B 1/0653 (2013.01) [A61B 1/041 (2013.01); A61B 1/0638 (2013.01); A61B 1/0655 (2022.02); A61B 1/0676 (2013.01); A61B 1/0684 (2013.01); A61B 1/07 (2013.01)] | 10 Claims |
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1. Illumination apparatus, comprising
an exit layer comprising a bottom surface and a top surface opposite to the bottom surface, wherein a phosphor is arranged in the exit layer;
a plurality of first light sources, each configured to emit, from a respective light emitting face, a first light of a first emission spectrum;
a plurality of second light sources, each configured to emit, from a respective light emitting face, a second light of a second emission spectrum different from the first emission spectrum; wherein,
the first light sources and the second light sources are arranged in plural unit cells;
each of the unit cells comprises at least one of the first light sources and at least one of the second light sources;
in each of the unit cells, the respective at least one first light source and the respective at least one second light source are arranged in a same way;
the plurality of unit cells is arranged periodically with a first period in a base area;
the plurality of the first light sources is controllable separately from the plurality of the second light sources;
the first and second light sources are arranged spaced apart from the exit layer such that, if the first and second light sources emit the first and second lights, respectively, each position of the bottom surface is illuminated by first lights from first light sources of at least two of the unit cells and by second lights from second light sources of at least two of the unit cells;
the phosphor is configured to convert at least a portion of the first lights into first converted lights such that, if the first and second light sources emit the first and second lights, a combined light exits the top surface of the exit layer;
if the phosphor is configured to convert at least a portion of the second lights into second converted light, the combined light comprises remaining portions of the first lights, remaining portions of the second lights, the first converted lights, and the second converted lights, wherein a spectrum of the first converted lights is different from a spectrum of the second converted lights;
if the phosphor is not configured to convert at least a portion of the second lights into second converted light, the combined light comprises remaining portions of the first lights, the second lights, and the first converted lights;
if the first and second light sources emit the first and second lights, respectively, on a line connecting corresponding positions of two adjacent unit cells of the plurality of unit cells projected on the bottom surface, a variation of a total intensity of the first lights is less than 20%, and a variation of a total intensity of the second lights is less than 20%.
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