There were few devices that offered them but never mainstream. Here is a snapshot of their page from 2014 that lists some of their partners: https://web.archive

There were few devices that offered them but never mainstream. Here is a snapshot of their page from 2014 that lists some of their partners: https://web.archive.org/web/20140228171904/http://pixelqi.com/devices https://web.archive.org/web/20140228171904/http://pixelqi.co... - mostly industrial applications and one Android tablet [1]. [1]: https://en.wikipedia.org/wiki/Adam_tablet https://en.wikipedia.org/wiki/Adam_tablet