Microsoft is still concerned about the problem, however, and is said to be recalling some test samples from the Norwegian market, where the phone recently launched. According to one person, when the brightness levels changes automatically, or when brightness is set to low, gray turns into a more dark purple color.
To address the possible concerns with Lumia 930 display, we have recalled some test samples from …the Norwegian market to be investigated further in our R/D site in Finland.
Thanks for the understanding.
The Nokia Lumia 930 and the Nokia Lumia 630/635, are the first two new Lumia models to come out of the box with Windows Phone 8.1 on board. If your Lumia 930 came with the purple tint problem, let us know if the quick fix helped you, by dropping your comments in the box below.
source: Henning.ms via WMPoweruser