The phrase "a second screen was" is correct and usable in written English.
It can be used when discussing the presence or use of an additional display or monitor in a context such as technology, gaming, or presentations.
Example: "During the presentation, a second screen was used to display the slides for the audience."
Alternatives: "an additional screen was" or "a supplementary display was".
A second screen was installed this season behind the photo area.
Following the prediction of endothelial genes, a second screen was performed to identify genes up regulated in tumours or foetal tissue.
A second screen was conducted to determine whether more clinically relevant compounds would also cause a prolonged lag phase phenotype at a higher dose.
A second screen was done with triplicates of 70 pieces of the left and right corners of the marginal zone, dissected and frozen individually from anterior embryo halves that had been cultured for 7 hr.
For reliability testing purposes, an independent examiner (A.S), shielded from the raters by a second screen, was present to provide the participants with feedback and correct any errors of technique that occurred during the trial.
To investigate the hypothesis that the terminal repeats might also be the sequences involved in the integration of the viral DNA into the host genome, a second screen was performed using the probes A and A' corresponding to the terminal regions of the viral genome (Fig. 1).
A second screen is devoted to navigation.
It worked fine but I'd worry that relegating a Vita to a second screen isn't a good use of the PS4's resources.
Twitter's take will augment your experience if you watched the whole Grammys on TV, but being merely a second screen is limiting.
Using the phone as a second screen, be it for multiplayer, inventory management, or some other feature, strikes me as a really natural way to make your platform special.
Viewer interaction via a second screen is becoming increasingly popular.
