Patent ID: 11929353
Assignee: NUVOTON TECHNOLOGY CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H  F | IPC F  H

Claim 0:
1. A white light emitting device, comprising:
a first light-emitting unit group including a plurality of first light-emitting units to which a first current is applied;
a second light-emitting unit group including a plurality of second light-emitting units to which a second current is applied, the second current being different from the first current; and
a mounting substrate on which the first light-emitting unit group and the second light-emitting unit group are mounted,
wherein each of the plurality of first light-emitting units includes a first light-emitting diode (LED) chip and a first phosphor member, and is arranged adjacent to at least another one of the plurality of first light-emitting units,
each of the plurality of second light-emitting units includes a second LED chip and a second phosphor member, and is arranged adjacent to at least another one of the plurality of second light-emitting units,
when the first current is applied to the plurality of first light-emitting units and the second current is applied to the plurality of second light-emitting units, an average emission chromaticity of the plurality of first light-emitting units and an average emission chromaticity of the plurality of second light-emitting units are identical colors, and
when a same current is applied to both the plurality of first light-emitting units and the plurality of second light-emitting units, the average emission chromaticity of the plurality of first light-emitting units and the average emission chromaticity of the plurality of second light-emitting units are non-identical colors,
wherein, when the average emission chromaticity of the plurality of first light-emitting units at a time of application of the first current to the plurality of first light-emitting units is represented by CIE coordinates (Cx11, Cy11),
the average emission chromaticity of the plurality of second light-emitting units at a time of application of the first current to the plurality of second light-emitting units is represented by CIE coordinates (Cx21, Cy21), and
the average emission chromaticity of the plurality of second light-emitting units at a time of application of the second current to the plurality of second light-emitting units is represented by CIE coordinates (Cx22, Cy22),
the identical colors are defined to satisfy relations of |Cx11−Cx22|≤0.0055 and |Cy11−Cy22|<0.0074, and
the non-identical colors are defined to satisfy one of relations of |Cx11−Cx21|≥0.0055 and |Cy11−Cy21|≥0.0074.