A screen that can be operated in at least two operating modes, viz B1 for a free viewing mode and B2 for a restricted viewing mode, comprising - a backlight extended in a planar manner that, in operating mode B1 for a free viewing mode, emits light into an unrestricted angular range, and, in operating mode B2 for a restricted viewing mode, emits light in a restricted angular range, - a transmissive imager arranged in front of the backlight as seen in the viewing direction, - light sources that are arranged outside the active image display area of the imager, and at the same time at a distance of at least 1 millimeter above the imager, as seen in the viewing direction, and / or - a plate-shaped light guide located in front of the imager as seen in the viewing direction, consisting of a transparent thermoplastic or thermoelastic material and scattering particles distributed therein, and/or having outcoupling elements on at least one of its faces, with light sources being arranged laterally at the edges of the light guide, - wherein, in operating mode B1, the light sources are switched off, so that the light originating from the backlight and then passing the transmissive imager remains uninfluenced by the light sources or, if a light guide is provided, passes the light guide essentially uninfluenced, and - wherein, in operating mode B2, the light sources are switched on, so that the light radiated by the backlight into a restricted angular range and then passing the transmissive imager is superimposed on by light that the imager scatters or reflects back into the viewing space in a diffuse and/or specular manner due to the irradiation of light from the light sources, or that, if a light guide is provided, is scattered or reflected back into the viewing space in a diffuse and/or specular manner due to the irradiation of light from the light guide and/or is radiated into the viewing space by the light guide in a planar manner over a wide angular range, - whereby, outside the said restricted angular range, the residual visibility of an image displayed on the transmissive imager is diminished. - a backlight extended in a planar manner that, in operating mode B1 for a free viewing mode, emits light into an unrestricted angular range, and, in operating mode B2 for a restricted viewing mode, emits light in a restricted angular range, - a transmissive imager arranged in front of the backlight as seen in the viewing direction, - light sources that are arranged outside the active image display area of the imager, and at the same time at a distance of at least 1 millimeter above the imager, as seen in the viewing direction, and / or - a plate-shaped light guide located in front of the imager as seen in the viewing direction, consisting of a transparent thermoplastic or thermoelastic material and scattering particles distributed therein, and/or having outcoupling elements on at least one of its faces, with light sources being arranged laterally at the edges of the light guide, - wherein, in operating mode B1, the light sources are switched off, so that the light originating from the backlight and then passing the transmissive imager remains uninfluenced by the light sources or, if a light guide is provided, passes the light guide essentially uninfluenced, and - wherein, in operating mode B2, the light sources are switched on, so that the light radiated by the backlight into a restricted angular range and then passing the transmissive imager is superimposed on by light that the imager scatters or reflects back into the viewing space in a diffuse and/or specular manner due to the irradiation of light from the light sources, or that, if a light guide is provided, is scattered or reflected back into the viewing space in a diffuse and/or specular manner due to the irradiation of light from the light guide and/or is radiated into the viewing space by the light guide in a planar manner over a wide angular range, - whereby, outside the said restricted angular range, the residual visibility of an image displayed on the transmissive imager is diminished.