Light source module having LEDs
First Claim
1. 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.
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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.
6 Citations
18 Claims
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1. A light source module having LEDs and a total light flux, F module, the light source module comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A light source module having LEDs and a total light flux, F_module, the light source module comprising:
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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. - View Dependent Claims (15, 16, 17, 18)
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Specification