Screen for a free and a restricted viewing mode and application thereof

A display screen that on at least a partial area A of its display area can be operated in at least two operating modes, viz B1 for a free viewing mode and B2 for a restricted viewing mode, wherein a residual display area of the display screen outside the partial area A permanently maintains a free-viewing mode, comprising:

• a first backlight of planar extension configured to radiate light in a non-restricted angular range and that, for the greater part, is arranged below the residual display area outside the partial area A,
• a second backlight of planar extension that radiates light in a restricted angular range and that, for the greater part, is arranged below the partial area A,
• a transmissive image generator arranged, in the viewing direction, in front of the two backlights,
• a plate-shaped transparent light guide that is located between the image generator and the two backlights and is provided on at least one of its large surfaces and/or within its volume with outcoupling elements for the outcoupling of light, so that it, through at least one large surface, outcouples light coupled in through at least one of its edges,
• light sources arranged laterally on at least one of the edges of the light guide,
• wherein the residual display area of the display screen outside the partial area A permanently maintains a free viewing mode,
• wherein the light guide is transparent to at least 70% of the light originating from the two backlights, and
• wherein in mode B1 at least the light sources are switched on, and wherein in mode B2 the first and second backlights are switched on and the light sources are switched off.