Combined light modulation device for tracking users

A light modulator device for a holographic or an autostereoscopic display for the representation of three-dimensional image information, the light modulator device comprising:

• at least one real or virtual light source;
• at least one light modulator;
• a first and a second light-affecting means;
• an eye position detection system;
• and
• a system controller;
• wherein encoded image information of an image to be represented to at least one observer eye of at least one observer is written to the at least one light modulator;
• wherein the first and the second light-affecting means is adapted to change the optical path of the light which is emitted by the light source;
• wherein the eye position detection system is adapted to find and follow at least one eye position of the at least one observer of the image information and the system controller is adapted to track at least one visibility region of the image information based on eye position information provided by the eye position detection system using the first and second light-affecting means;
• wherein the first light-affecting means tracks the visibility region to the eyes of the observer in large steps within the observer range and that the second light-affecting means tracks the visibility region to the eyes of the observer finely graduated or continuously at least within one such large step of the first light-affecting means with the help of at least one electrically controllable diffraction grating;
• wherein the first light-affecting means includes a device for changing the positions of the light sources and/or their emission directions;
• and
• wherein the first light-affecting means comprises at least one volume hologram to which at least two angle-selective diffraction angles and/or field lens functions are written, which are selectable by changing the direction of light incidence.