It seems a continuum - screens on PW go from white to rainbow - with everywhere in between.
But yours is close to the 'rainbow' side of things.
I hate dealing with returns (and I did not return mine, which is not perfect either - but more uniform than yours) - but, in this case, it seems warranted.
The only note is - my screen got much better after 3-4 days of usage. I am not sure if it was some sort of burn-in (perhaps of glue residues?) - but my screen got progressively better over the first days. And no, it was not just me getting used to it.
So maybe waiting a couple of days might be a good idea? Unless you had the device for a while already...
I received in inheritance neither god, nor a given spot on earth from where I can draw the attention of a god: no one either legated me the well disguised fury of the skeptic, the Sioux guiles of the rationalist or the burning innocence of the atheist. So I dare not throw the stone neither at the one who believes in things which inspire me only doubt, nor at the one who cultivates his doubt as if it was not, just as well, surrounded with darkness.