Abstract: Seamless display screens that are portable and can be installed in a fast manner, as well as a projection unit for use with several projectors as well as methods of making such display screens. The projection unit can be suitable for being used as a rear projection unit. Devices are provided for reducing depth of the projection unit, to compensate for blend zones and to make it easy to transport such as to be suitable for trade shows, e.g. mirrors or Fresnel lenses.

Abstract: A spacer plate (3, 6, 7) for interconnecting support profiles (1, 5, 8, 9) of a display support structure (23) is described, including at least one alignment opening (11) for receiving an alignment stud (2) for aligning a first profile (1, 8) with respect to a second profile (5, 9) via the spacer plate (6), and at least one connector opening (13) for receiving a connector bar (4) for connecting the first profile (1, 8) to the second profile (5, 9) via the spacer plate (6), wherein the connector opening (13) is connected to the alignment opening (11) such that the relative position of the alignment stud (2) inside the alignment opening (11) is adjustable by the position of the connector bar (4) inside the connector opening (13). This allows to easily put the alignment stud (2) into the alignment opening (11) of the spacer plate (3, 6, 7) or vice versa and to eliminate all free play between the alignment stud (11) and the spacer plate (3, 6, 7) at the same time.