LG has unveiled an intriguing video teaser for a multi-screen smartphone set to be unveiled at IFA Berlin next month. The teaser shows a smartphone that can fold out to double its display size but could even offer a tertiary display or what may be a translucent secondary display.
https://www.notebookcheck.net/LG-teases-dual-screen-phone-for-IFA-that-could-incorporate-a-futuristic-translucent-display-panel.428778.0.html