US 8,803,170 B2Granted

Light source module having LEDs

AssigneeLextar Electronics Corporation

InventorsPei-Song Cai, Yong-Hong Liao, Tzu-Pu Lin, Yun-Yi Tien, Jian-Chin Liang

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Abstract

A light source module includes a substrate, a first LED package and a second LED package. The first and second LED packages are disposed on the substrate. The first LED package includes a first blue LED chip and a first phosphor. The first blue LED chip emits light in the range of the wavelength for blue light. The first phosphor is used to convert the wavelength of a portion of the light emitted from the first blue LED chip. The second LED package includes a second blue LED chip and a second phosphor. The second blue LED chip emits light in the range of the wavelength for blue light. The second phosphor is used to convert the wavelength of a portion of the light emitted from the second blue LED chip. The wavelength associated with the second phosphor is greater than that associated with the first phosphor.

Claims18

Dependent claims

A light source module having LEDs and a total light flux, F module, the light source module comprising:

a substrate;
at least one first LED (light emitting diode) package disposed on the substrate, the first LED package comprising:
a first blue LED chip emitting light that is in the range of the wavelength for blue light;
a first phosphor for converting the wavelength of a portion of the light emitted from the first blue LED chip;
and
at least one second LED package disposed on the substrate, the second LED package comprising:
a second blue LED chip emitting light that is in the range of the wavelength for blue light;
and
a second phosphor for converting the wavelength of a portion of the light emitted from the second blue LED chip;
wherein the wavelength associated with the second phosphor is greater than the wavelength associated with the first phosphor;
wherein a number of the at least one first LED package is m, and a number of the at least one second LED package is n, wherein m and n are both positive integers;
wherein each of the first LED package emits a first light flux F1, and each of the second LED package emits a second light flux F2;
wherein the total light flux of the light source module, F_module, satisfies:
F_module=F1×m+F2×n;
wherein an arithmetic mean of an equivalent light flux of the light source module, F_mean satisfies:
F_mean=(F1×m+F2×n)/(m+n);
wherein the arithmetic mean of the equivalent light flux of the light source module, F_mean is optimized by choosing the first light flux F1, the second light flux F2, the number m of the at least one first LED package, and the number n of the at least one second LED package,
wherein a plurality of first CIE (CIE chromaticity diagram) coordinate points are provided based on different ratios of the first phosphor, a first line is drawn by the first CIE coordinate points, and the first line is substantially straight;
wherein a plurality of second CIE (CIE chromaticity diagram) coordinate points are provided based on different ratios of the second phosphor, a second line is drawn by the second CIE coordinate points, and the second line is substantially straight.

16 more elements

A light source module having LEDs and a total light flux, F_module, the light source module comprising:

a substrate;
at least one first LED package disposed on the substrate, the first LED package comprising:
a first blue LED chip emitting light that is in the range of the wavelength for blue light;
a first phosphor for converting the wavelength of a portion of the light emitted from the first blue LED chip;
and
at least one second LED package disposed on the substrate, the second LED package comprising:
a second blue LED chip emitting light that is in the range of the wavelength for blue light;
and
a second phosphor for converting the wavelength of a portion of the light emitted from the second blue LED chip;
wherein the wavelength associated with the second phosphor is greater than the wavelength associated with the first phosphor;
wherein a number of the at least one first LED packages is m, and a number of the at least one second LED packages is n, wherein m and n are both positive integers;
wherein each of the first LED packages emits a first light flux F1, and each of the second LED packages emits a second light flux F2;
wherein the total light flux of the light source module, F_module, is a sum of the first light flux F1 multiplied m and the second light flux F2 multiplied by n;
wherein an arithmetic mean of an equivalent light flux of the light source module, F_mean is the total light flux of the light source module F_module divided by a sum of m and n;
wherein the first light flux F1, the second light flux F2, the number m of the first LED packages, and the number n of the second LED packages are chosen to optimize the equivalent light flux F_mean;
wherein a plurality of first CIE (CIE chromaticity diagram) coordinate points are provided based on different ratios of the first phosphor, a first line is drawn by the first CIE coordinate points, and the first line is substantially straight;
wherein a plurality of second CIE (CIE chromaticity diagram) coordinate points are provided based on different ratios of the second phosphor, a second line is drawn by the second CIE coordinate points, and the second line is substantially straight;
wherein a slope of the first line is fixed and a slope of the second line is fixed.

15 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/570,560Filed 9 Aug 2012
Priority: TW 101108886 A15 Mar 2012
Published: US 2013/0240921 A119 Sep 2013
Granted: 12 Aug 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

F21K 9/00
Light sources using semiconductor devices as light-generating elements
F21Y 2113/13
Of different colours: comprising an assembly of point-like light sources
F21Y 2115/10
Light-generating elements of semiconductor light sources: light-emitting diodes [LED]
H05B 45/20
Circuit arrangements for operating light-emitting diodes [LED]: controlling the colour of the light