If you're paying attention parallax is noticeable, but with a high result ion display, and position mostly in the center of a long room like that one it won't be noticeable unless you're looking for it.[DOUBLEPOST=1383069494,1383069386][/DOUBLEPOST]Though if you wanted to hide the parallax issue you could add curtains to the two sides with a fan nearby that would cause them to move a little.
However in high end digital window systems you actually use a camera and face tracking software to change the image on the display for a single visible user. That fixes the parallax issue as long as you are far away from your subject, like on a high rise.