The United States Patent and Trademark Office (USPTO) has published a patent application for "Luminescence shock avoidance in display devices" that was filed by Apple in December 2017. Luminescence shock occurs when a device is turned on in a dark environment and the brightness of the display temporarily impairs the user's vision.
https://www.notebookcheck.net/Apple-patent-deals-with-luminescence-shock.298124.0.html