Tricoloured Light Emitting Diode
The most popular type of tricolour light emitting diode comprises of a single Red and a Green LED combined in one package with their cathode terminals connected together producing a three terminal device. They are called tricolour LEDs because they can give out a single red or a green colour by turning “ON” only one LED at a time.
These tricoloured LED’s can also generate additional shades of their primary colours (the third colour) such as Orange or Yellow by turning “ON” the two LEDs in different ratios of forward current as shown in the table thereby generating 4 different colours from just two diode junctions.