The full diagram would require that you are able to produce monochromatic colors along the entire visual spectrum. So at a minimum you would need a tunable mono

The full diagram would require that you are able to produce monochromatic colors along the entire visual spectrum. So at a minimum you would need a tunable monochromatic light source. Several actually to blend to any point on the graph. Luckily, due to limits of the human visual system, you don't require a fully tunable spectrum for each pixel. I'm not aware of any technology that would let us cram this into pixels. At best you could build a projector from tunable lasers.