Re: need multiple colour LEDs
Yellow or Cyan can be:
a monochromatic source
OR
a mix of monochromatic sources
OR
a mix of broad spectrum sources.
Magentas are an illusion in sense they don't exist by splitting white light in a prism. They are a mix of colours from high frequency and low frequencies of the spectrum with the green our eye's green sensor uses depressed. Such objects will be unnatural if seen in discontinuous fake white light (e.g. Violet LED + yellow phosphor, or worse R G B LED even if colour temperature is correct).
Real life objects have broad spectrum of reflection or else they appear dim.
The R G & B of our eyes responses are very broad indeed and overlap.
Any discontinuous spectrum seriously distorts the perceived colours. Colour video is a trick. You use broad spectrum genuine white light to illuminate and then the camera sensors must NOT be narrow R G B filters, but overall have the same response as a typical eye (thus red has tiny blue response and some green, and Blue has some green and very little red). Green sensor peaks at green but has some sensitivity on the entire spectrum.
Then the display can use monochromatic R G B at the eye peaks, or for less colour range, other sources with the data matrixed. You can even add pure Yellow and/or pure Cyan too as long as the driver matrix is correct. Monochromatic Cyan stimulates Green annd Blue part of eye (and a little red) and Mono Yellow the Red and Green plus a little blue). This might be done to make whites brighter or improve pastel shades if the R G and B are not the ideal frequencies.
See https://en.wikipedia.org/wiki/Colour_perception
also
https://en.wikipedia.org/wiki/File:Cone-fundamentals-with-srgb-spectrum.svg
Note the lens and covering of the eye blocks almost all UV. Everyone is more UV sensitive in the blue if a synthetic lens with no UV filter is fitted. Some women do appear to be slightly tetrachromatic, so they will not be so impressed by your new TV.
Biting the hand that feeds IT
