Laser projectors already include green lasers made by the same principle, but made from separate semiconductor lasers and non-linear crystals.

With this technology, which integrates the non-linear crystal with the semiconductor laser, it may become possible to make cheaper laser projectors, either by making an integrated green laser, or perhaps even an integrated triple laser, for all 3 primaries, but the difference in cost will not be great, because the green laser is a rather small fraction of the total cost (though it may be more expensive than the red and blue lasers together).