Henry Danger, a show on nickelodeon has featured transparent phones and tablets for years. Seems like they were right that this was the future:
https://opera.news/ng/en/technology/6a64c11b10e73b1e7f76cd12...
https://nickalive.blogspot.com/2015/11/sneak-peek-of-new-hen...
http://nickalive.blogspot.com/2015/11/sneak-peek-of-new-henr...