Abstract: Light from a light source reaches a control element via a lens system and a first bar system, is reflected and diffracted there according to local deformations and passed on to a projection surface via a concave reflector, a second bar system and a further lens system. The picture to be amplified is imaged by means of a lens system on a photoelectric conducting layer in the control element. A control layer of the control element is a gel layer and is located between two electrodes in an electrical alternating field that is influenced by the photoelectric conducting layer. The electrode adjacent to the photoelectric conducting layer is formed as a strip grid wherein all strips have the same potential relative to the other electrode. The image to be amplified is exposed on the photoelectric conducting layer in grid-masked form, whereby the grid is disposed orthogonally to the electrode grid. The electrode grid is disposed orthogonal to the bars.