Abstract: A method and a device for synchronizing the display of video frames from a video stream of a video insertion of a video image source, which is simultaneously presented on two or more displays of a display wall. The synchronous, tearing free display is realized by means of a video frame queue for the video frames, a mediation function which is commonly used by the network graphics processors involved in the display of the video insertion and which, during a mediation period that extends over a plurality of vertical retraces of the display wall, determines which video frame is displayed by the displays and establishes a balance between the vertical display frequency and the video stream frequency, and synchronization messages which are sent before the start of a mediation period by a master network graphics processor of a display to the slave network graphics processors of the other displays.

Abstract: In order to align the optical components of a projection apparatus (1), more particularly a rear projection apparatus of a projection wall, wherein the projection apparatus (1) comprises a light mixing rod (8), it is proposed to arrange an alignment deflecting mirror (19) in the illumination path of the imaging device (11) between the lamp (3) and the light mixing rod (8), wherein said alignment deflecting mirror (19) can be adjusted by means of servo motors (23).

Abstract: In order to align the optical components of a projection apparatus (1), more particularly a rear projection apparatus of a projection wall, wherein the projection apparatus (1) comprises a light mixing rod (8), it is proposed to arrange an alignment deflecting mirror (19) in the illumination path of the imaging device (11) between the lamp (3) and the light mixing rod (8), wherein said alignment deflecting mirror (19) can be adjusted by means of servo motors (23).