Color tunable light source module with brightness and dimming control
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United States of America Patent
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Oct 17, 2017
Issued Date -
Oct 9, 2014
app pub date -
Apr 3, 2014
filing date -
Apr 4, 2013
priority date (Note) -
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Abstract
LED-based light source modules can incorporate color tunability and brightness control, allowing a user to select a desired color temperature and/or brightness and to change either or both dynamically. An emitter can include multiple independently addressable groups of LEDs, each emitting light of a different color. By controlling the relative operating current provided to each group, a desired color temperature can be achieved, and by controlling the absolute operating currents, the brightness of the output light can be controlled. Pulse width modulation (PWM) can be used to control the relative and absolute operating currents. Smooth, gradual transitions between brightness and/or color temperature settings in response to changes can be provided.
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