One needs a white tent pitched behind the laptop screen, and one needs to sit facing the sun. You'd be looking into the space of the tent, which is much like the display in the OP demonstration except the source of light is the sun coming through diffused through the tent fabric (and there are no buildings). The bottom floor could be a mirror.
SUN
/\
fab. / \ <-- laptop LCD
/ \
/ tent \
--------======== <- keyboard
mirror
where fab == white tent fabric