secondary colors from multicolored LEDs

Posted on Mar 30, 2013

Figure 1 shows the various LED-circuit configurations, and Figure 2 shows the timing to generate all three colors from bicolor and tricolor LEDs, although using only one LED`s operating current. Note that the driver for the bicolor LED must be able to sink and source current. You may have to provide color balance between the primary-color LEDs to ensure that the secondary colors appear properly. The LEDs have different efficiencies and intensities as the human eye sees them, and these parameters need correcting. For tricolor LEDs in a common-anode or -cathode configuration and 50% duty cycle, the correction is easy to effect by adjusting the current-limiting resistors.

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