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

Claim 7:
8. 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,
when light with a wavelength equal to a wavelength of one of the first LED chip and the second LED chip is emitted to the first phosphor member and the second phosphor member,
P1 is an average value of emission intensities of all of the first phosphor members included in the first light-emitting unit group, and
P2 is an average value of emission intensities of all of the second phosphor members included in the second light-emitting unit group,
a relation of 0.954≤P2/P1≤0.976 is satisfied.