The phrase "a portable screen" is correct and usable in written English.
You can use it when referring to a screen that is designed to be easily moved or transported, often used for presentations or displays.
Example: "For our outdoor event, we will need to rent a portable screen to showcase the presentation."
Alternatives: "a mobile display" or "a transportable monitor."
It was rumoured that they had built a "tablet" – a portable screen on which people could read newspapers.
Entire villages would gather in clearings; at sunset the generator would start up and the movie would be projected onto a portable screen in the gathering darkness.
The Rocket, which has the heft of a folded-over paperback, is a portable screen that displays a single page of text at a time.
After we'd eaten, one of the organizers gathered everybody around a portable screen and formally apologized to the two representatives of the Coastal Protection and Restoration Authority.
Spaulings is showing an editioned film transfer of the sampler "Film, Left," which shifts from a DVD player to a projector and a portable screen.
The abundance of information available on a portable screen – telling us where to go, what to do and who to meet – mediates our relationship to the city, distancing us from its physical and, to some degree, psychological realities.
My project, the Mobile-Enabled Foot Analyzer (m-DFA), will be a portable screening device that can be operated by community health workers in patient's homes.
This techonology will be a portable screening device which will help in tracking neuropathy, a nerve damage that typically leads to loss of sensation in the feet and is a major cause of foot ulcers and leg amputations.
A portable screening system based on Laser Raman spectroscopy has been developed to quantify melamine (Cheng et al. 2010).
At last month's CeBit trade show in Germany it unveiled the airpanel 100, a wireless portable screen that looks a lot like a previous product it has made, called the View Pad.
Glasses-free 3-D effects are easier to produce on a small, portable screen than on a large, stationary one, said Paul Semenza, a senior vice president at the market researcher DisplaySearch in Santa Clara, Calif.
