Screens for free viewing mode and limited viewing mode and their applications

摘要

The present invention can be operated for at least two operation modes in at least a partial area (A) of the display area, namely a free viewing mode (B1) and a limited viewing mode (B2), and a display screen outside the partial area (A) ( The remaining display area of 1) is a display screen 1 that permanently maintains the free viewing mode, emitting light in an unrestricted angular range, and for a wider part, below the remaining display area outside the partial area A a first backlight 2a of a planar extension disposed on; at least one second backlight 2b of the planar extension, which emits light in a limited angular range and, for a wider portion, is disposed under the partial area A; a transmissive image generator (5) arranged in the viewing direction in front of the two backlights (2a, 2b); A plate-shaped transparent light guide 3 positioned between the image generator 5 and the two backlights 2a, 2b and designed in such a way as to outcouple the combined light through at least one of the edges through at least one large surface. ); and a light source (4) arranged laterally on at least one of the edges of the light guide (3), wherein the light guide (3) is transparent to at least 70% of the light emitted from the two backlights (2a, 2b) and, in mode B1, at least the light source 4 is turned on, in mode B2 two backlights 2a, 2b are turned on and the light source 4 is turned off.