It seems, Microsoft has acknowledged that some Lumia 930 displays are exhibiting purple tone in certain brightness conditions. This may be directly related to “color calibration” of the display panel and there has been many instances in past when some OLED displays have this issue. But, this usually gets resolved with a bit of Firmware tuning.
As you can see in the above tweets, @NokiaHelps has informed that Microsoft is indeed working to resolve it with a future software update.
Thanks Jandu for the tip. Cheers!!