The method involves determining an eye position of a display observer by a control unit using inverse ray analysis, and providing an address data for activating illumination units to prepare defined sweet spots (5) from the position data. Optical component is used in a path of rays for the analysis. The control unit detects and considers a defined angle of a diffractive unit in a preset angular range and an observer viewing angle. An independent claim is also included for a device for controlling a sweet spot unit for a display with an image matrix and pixels.
Method and device for tracking sweet spots and automatic 3-D display