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

Claim 5:
6. 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 an average value of chromaticities of all of the first phosphor members included in the first light-emitting unit group is represented by CIE coordinates (CxP1, CyP1), and
an average value of chromaticities of all of the second phosphor members included in the second light-emitting unit group is represented by CIE coordinates (CxP2, CyP2),
relations of 0.0066≤|CxP1−CxP2| and 0.0120≤|CyP1−CyP2| are satisfied.