Apple's Heating iPhone March 01 2019
The foldable smartphone era is in full swing with the recent introductions of the Samsung Galaxy Fold and Huawei Mate X, and while it remains unclear if Apple will follow suit, the company has at least explored ideas related to foldable smartphones in patent applications over the past few years. For example, Apple says the portion of the display that bends could be heated by lighting up the pixels in that area of the screen.
Alternatively, a "heating element or other heating structure" could be used, although Apple wasn't specific. For the full article click here https://www.macrumors.com/2019/02/28/self-heating-foldable-iphone-display-patent/