“Finally, holographic lenses can be constructed so that the lens pro- files can be independently controlled for each of the three color primaries, giving more degrees of freedom than refractive designs. When used with the requisite laser illumination, the displays also have a very large color gamut.”
They have full colour working, and apparently well, in the benchtop prototype.
There’s discussion towards the end as to options for implementing full colour in the HMD prototype.
https://research.fb.com/wp-content/uploads/2020/06/Holograph...
“Finally, holographic lenses can be constructed so that the lens pro- files can be independently controlled for each of the three color primaries, giving more degrees of freedom than refractive designs. When used with the requisite laser illumination, the displays also have a very large color gamut.”
They have full colour working, and apparently well, in the benchtop prototype.
There’s discussion towards the end as to options for implementing full colour in the HMD prototype.