Abstract: An image distribution system has a multiplexer (2) with inputs receiving images from images sources (41, 48). The multiplexer multiplexes images from said sources and provides on a connection (6) multiplexed images. Separate display devices (8, 10, 12) are connection in series to connection (6). Each display device has a demultiplexer (14, 16, 24) which receives multiplexed images and which outputs demultiplexed images. Using multiplexed sources and a single connection makes it possible to reduce the number of cables for distributing the images to the various display devices. The images displayed on one of the display devices may be changed at will without having to change the connection to the display device.

Abstract: A video wall (2) is formed of several adjacent displays (141-1415). The display surfaces of the adjacent displays form a continuous or quasi-continuous display surface for the video wall. The wall has an input adapted for receiving images from multiplexed sources. The images from the multiplexed sources are demultiplexed in a demultiplexer (22). The demultiplexer provides images from the demultiplexed sources to processors (241-2415) for display on the adjacent displays. Using multiplexed sources makes it possible to reduce the number of cables at the input to the wall or to increase the number of images that may simultaneously be displayed on the wall.

Abstract: A rear projection screen has successively, starting from the projector and moving outwards, a Fresnel lens (6), a surface diffuser (8), a thin support (10) bonded onto a thick substrate (24) provided with an outer anti-glare (26) layer. Light emitted by the projector (2) is collimated by the Fresnel lens (6). It passes through a diffuser (a) having an elongated radiation diagram with a horizontal major axis. This diffuser provides spreading of light in the horizontal plane, so as to provide a wide horizontal angle of view. The light leaving the diffuser is received on a support (10) with cylindrical focusing elements (18) substantially parallel to the major axis of the diffuser radiation diagram and an opaque layer (20) with apertures (22) adapted to allow light focused by the focusing elements to pass. As the focusing elements are parallel to the major axis of the diffuser, practically all the light projected is transmitted.

Abstract: The invention concerns a rear projection screen, comprising a support (22) with focusing elements such as microlenses (26) or lenticular elements, a holographic diffuser, and an opaque layer (36) with apertures (38) for allowing through the light focused by the microlenses. The light projected from the rear of the screen is concentrated by the microlenses (26) and passes through the opaque layer by the apertures (38). The holographic diffuser controls the directivity of the light. The incident light on the screen is absorbed by the opaque layer, such that the layer provides good transmittivity, high contrast, and controlled directivity owing to the holographic diffuser. The invention also concerns a method for making such a rear projection screen whereby the apertures in the opaque layer are formed by irradiating said layer or a preparatory material through the microlenses.