Light color and intensity adjustable LED
First Claim
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1. An apparatus, comprising:
- a first light-emitting diode (LED) assembly that includes a plurality of first LEDs;
a second light-emitting diode (LED) assembly that includes a plurality of second LEDs;
a first driver coupled to the first LED assembly;
a second driver coupled to the second LED assembly;
a light detector coupled to each of the first and second LED assemblies, wherein the light detector is configured to measure a first light output of the first LED assembly and a second light output of the second LED assembly; and
a controller coupled to the light detector and to each of the first and second drivers, wherein the controller is configured to;
receive the first light output and the second light output from the light detector;
compare the first light output with the second light output; and
upon detecting a difference between the first light output and the second light output, control the first and second drivers to reduce a difference between the first light output and the second light output.
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Abstract
An integrated photonic device includes a number of LEDs and a feedback mechanism that measures individual LED light outputs using a photo sensor via a light transmitter disposed in the vicinity of individual LEDs. A controller or driver adjusts a current driven to each LED using the detected values according to various logic based on the device application.
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Citations
20 Claims
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1. An apparatus, comprising:
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a first light-emitting diode (LED) assembly that includes a plurality of first LEDs; a second light-emitting diode (LED) assembly that includes a plurality of second LEDs; a first driver coupled to the first LED assembly; a second driver coupled to the second LED assembly; a light detector coupled to each of the first and second LED assemblies, wherein the light detector is configured to measure a first light output of the first LED assembly and a second light output of the second LED assembly; and a controller coupled to the light detector and to each of the first and second drivers, wherein the controller is configured to; receive the first light output and the second light output from the light detector; compare the first light output with the second light output; and upon detecting a difference between the first light output and the second light output, control the first and second drivers to reduce a difference between the first light output and the second light output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method, comprising:
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providing a first light-emitting diode (LED) assembly that includes a plurality of first LEDs; providing a second light-emitting diode (LED) assembly that includes a plurality of second LEDs; providing a first driver coupled to the first LED assembly; providing a second driver coupled to the second LED assembly; measuring a first light output of the first LED assembly and measuring a second light output of the second LED assembly; and comparing the first light output with the second light output; and operating, based on results of the comparing, the first and second drivers to minimize a difference between the first light output and the second light output. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An apparatus, comprising:
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a first light-emitting diode (LED) assembly that includes a first red LED, first green LED, and a first blue LED; a second light-emitting diode (LED) assembly that includes a second red LED, a second green LED, and a second blue LED, wherein the first and second LED assemblies are electrically coupled in parallel; a first driver coupled to the first LED assembly; a second driver coupled to the second LED assembly; a light detector coupled to each of the first and second LED assemblies through first and second optical transmission lines, respectively, wherein the light detector is configured to measure a first light output of the first LED assembly and a second light output of the second LED assembly; and a controller coupled to the light detector and to each of the first and second drivers, wherein the controller is configured to; receive the first light output and the second light output from the light detector; compare the first light output with the second light output; and operate the first and second drivers to reduce differences between the first light output and the second light output. - View Dependent Claims (20)
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Specification