The article this one links to has more information and a surprisingly in-depth video https://www.theengineer.co.uk/issues/october-2013-online/researchers-create

The article this one links to has more information and a surprisingly in-depth video https://www.theengineer.co.uk/issues/october-2013-online/researchers-create-screen-you-can-feel-without-touching-it/ https://www.theengineer.co.uk/issues/october-2013-online/res...