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in more detail.
Figure 4 (below) illustrates the effect of shifting the
phase
of the
red, green and blue lights relative to one another. In this case, a
sine wave
is being used.
One full cycle of a waveform occurs over 360 degrees, and if there
is no phase shift, it starts at 0 degrees, rises and falls in a half-circle,
intersects the X-axis at 180 degrees, and completes the lower
(negative) half circle at 360 degrees. In the example below, this is
illustrated by the color red. Notice that
blue
is exactly the opposite
of
red
and so they are 180 degrees out of phase with one another.
This means that when
red
is at maximum brightness,
blue
is off
and vice versa.
Green
is shifted by about a quarter of a full wave to the right, a 90
degree phase shift. So it starts to turn on just as
red
reaches its
Figure 4.
maximum brightness, and reaches its maximum brightness as
red
is
just turning off. So the
red
and
green
are changing brightness rela-
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