The invention relates mainly to a seat intended to be installed in an aeroplane, having: a backrest having a front face against which a passenger is intended to lean, and a rear face on the opposite side from the front face, a tray, notably a retractable tray, known as a meal tray, positioned on the rear face of the backrest, characterized in that said seat also has a device for supporting a portable screen, comprising a support element that is positioned on the rear face of the backrest and movable between a folded position and a deployed position in which it is able to support a portable device.