rainbow effect (RBE)
The rainbow effect is an artifact in the display of video signals with DLP projectors(Digital Light Processing), in particular with DLP projectors in 1- chip design. In moving scenes, the filter colors of the RGB color wheel appear as rainbows at the edges with strong contrast changes.
The rainbow effect is caused by the RGB color wheel and its rotation speed. The higher the rotation speed, the less annoying the rainbow effect, which, however, depends on the viewer's personal perception. Experience shows that at an RGB rotation frequency of the color wheel of 50 Hz to 150 Hz, the effect is visible to all viewers and is perceived as disturbing. At 200 Hz to 250 Hz, the rainbow effect is much less pronounced and only visible at high contrast. At over 300 Hz RGB color wheel frequency, it is only perceived by some viewers.