Abstract: An optical design is described to be used in a color projection system. The system comprises a white light source (52), a light splitting means to split the white beam into color subbeams, optical components to direct each color subbeam on a light modulating means (56) and a dichroic prism (70). The light splitting means and the optical components are arranged such that each of the images of the color subbeams imaged on the light modulating means (56) has equal size and orientation, i.e. such that the magnification of the color subimage on the light modulating means (56) is equal. This is obtained by providing equal light paths for each color subbeam or by providing optical components such that either all different color images on the screen are inverted or none of the different color images are inverted.

Abstract: The present invention provides a projection device comprising: at least two input channels for receiving at least a first and a second input image signal, an image recombination system for combining the input image signals into one imaging signal, an input port for receiving user inputs, a processing unit adapted for running an operating system, the operating system being for commanding the image recombination system in accordance with received user inputs, an image forming display device for displaying an image corresponding to the imaging signal, and a projection lens for projecting the imaging signal onto a visualisation surface. In other aspects, the present invention also provides a projection system comprising such projection device, and a method for projecting multiple images adjacent each other. It is an advantage of the present invention that, due to the use of an operating system in the projection device, a user-friendly source selection capability is offered.