You should not call other people ignorant. Your explanation is very confused.
You are confusing subtractive color mixing (as in printing) with additive color mixing (which kind of happens in LED displays although LED displays are not purely additive, but they are definitely not subtractive in any way).
Honestly I have to admit I am not certain why the Sharp display uses yellow pixels, but it has nothing to do with what happens in printers, as they operate on quite different principles.
My explanation may be confusing to you, but it is certainly not confused.
I did not confuse additive and subtractive primaries, and I clearly know the difference. It is my job to know the difference. I have profiled everything from litho presses, to numerous ink jets, displays of every kind, scanners, cameras, and light-jet photographic emulsion printers.
It just so happens that the same essential principles apply to either. Both reflective and emissive color gamut can be expanded by adding non-primary colors. People tend to understand ink on paper better than they understand light. I used it as a point of comparison.
Furthermore, color printing is no more "mixing" inks than display technology is "mixing" LEDs, LCD cells, or CRT phosphors. Discreet cells. Discreet dots. Same principle.
It would be the same principle, if color printing were only about placing discrete colored dots next to each other in order to form new colors, but that is not usually the case. Color printing usually involves placing different color inks over each other, and that makes everything different.
In any case, if you are curious, look up wikipedia for subtractive color and additive color and color mixing.
You are confusing subtractive color mixing (as in printing) with additive color mixing (which kind of happens in LED displays although LED displays are not purely additive, but they are definitely not subtractive in any way).
Honestly I have to admit I am not certain why the Sharp display uses yellow pixels, but it has nothing to do with what happens in printers, as they operate on quite different principles.