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Create multicolored LEDs (BAT43)

2014-12-16 18:57  
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It is well-known that simultaneously mixing two primary-colorlightsources, such as red and green, creates a secondary color, such as yellow. This mixing process commonly occurs in tricolorLEDs.
Advantages include lower power dissipation and more uniform intensities
between primary and secondary colors. Experimentation with two or three
primary-colorLEDsshows that the flash sequence must complete within approximately 25 msec orlessto produce a solid secondary color or whitelight.?

Create secondary colors from multicolored LED Create multicolored LEDs

You may have to provide color balance between the primary-colorLEDs
to ensure that the secondary colors appear properly. The waveforms at
the bottom of Figure 2 illustrate duty-cycle control to achieve
secondary-color balance for both bicolor and tricolorLEDs.

Using a sequenced bicolor LED to generate three colors has packaging advantages, particularly when you vertically stack severalLEDs. The generation of secondary colors can also extend to RGBLEDs(Table 1). You can achieve color balancing by adjusting the current-limiting resistors or the duty cycle.?


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