Miniature projectors mounted to the frame of your glasses at your temples would enable 3D projection of your display. Small projectors are getting better every year, it won't be too long before they will be capable of projecting a bright enough image with enough contrast to rival the LCD displays of
laptops at the same distances.
As an aside: A silver or bright white screen would be best possibly even saving energy over the LCD. A screen comprised of extremely small reflectors would enhance privacy by reducing viewing angle to stay within the two projectors. In order to keep your private projection to yourself, the screen could have a focus image similar to a barcode - if the projectors could not read the barcode or if it was the wrong barcode the image would not display on the screen. Anyway, I'll call this "external projection".
The screen should be easy to take out, lightweight, and ultra user-friendly. I'm envisioning a screen stretched by a springy wire and held up with foam encased copper wires (could be wrapped around anything or shaped for optimum balance on any surface). To put it away you just grab the outer rim and twist in opposite directions, collapsing the screen onto itself. For a large screen this could be done several times over until it's folded into a managable size. Velcro tabs would then help keep it that way.
At longer external projection distances the projector lamps may need an extra kick - possibly provided by a piggybacked (specialized) LED flashlight. High contrast could be achievable via a transparent lens with e-ink technology or something similar to cut-off light going to portions of the display that need to be black or very dark.
If no screens are available or if you just want to do something quick without pulling out your screen, the projectors could twist inwards and project the image at the back side of your glasses lenses. The lenses would need to have a special kind of "polarized" coating possibly nanotubes. The tubes would be oriented so that normal vision is unimpeded but when light is shone from an angle the tubes are illuminated. This would create kind of a ghost screen of fairly low brightness and decent if not excellent resolution for reading text. I'll call this "internal" projection.
Each projector would communicate with your computer wirelessly (bluetooth?) but would have lightweight batteries for internal projection. External projection could use the batteries from the piggybacked LED when in place or a mini-USB could plug into the glasses frames just behind the ear.
I'm thinking the computer(s) could be anything from a full-on 10lb laptop to your phone. Since most people like to travel with both their phone and their laptop you could task each projector to a separate computer and have two displays instead of one 3D display. Leave your phone in your pocket and your laptop in your bag (probably on your back - in order to keep the USB cables from getting tangled unnecessarily.)