Reminds me of the short-lived Windows SideShow display on a few laptops (~2003):

https://en.wikipedia.org/wiki/Windows_SideShow

It was only on Vista, so some time after 2007.

I remember working on the host software for a thing similar to the display we're discussing around ... 2012.

It never went into manufacturing though. Some combination of Win 7 dropping sideshow and ... some widget feature we also mirrored.