Apple had it in 1993 (minus the power): http://www.kan.org/6100/graphicshardware.html
But NeXT had it in '88, power included (!): http://www.uk.netbsd.org/ports/next68k/faq.html#connections
But NeXT had it in '88, power included (!): http://www.uk.netbsd.org/ports/next68k/faq.html#connections
Apple had the one-cable thing back in 1998.
https://en.wikipedia.org/wiki/Apple_Display_Connector
Power went the other way, but still. Crazy it's taken us this long to get back to it.