I've used both the MicroOptical HUD in 1999 (by which time it was full-color and around 640x480) and Google Glass in 2013. The display was essentially identica

I've used both the MicroOptical HUD in 1999 (by which time it was full-color and around 640x480) and Google Glass in 2013. The display was essentially identical (which is unsurprising, since Google acquired many of the patents involved), the main change was in the power supply: the original MO required lugging around a huge box clipped to your belt, while Glass had an onboard battery.