The screen consists of concrete with embedded optical fibres, arranged as pixels, capable of transmitting natural as well as artificial light. The light-admission points are on the back of the screen where the fibres are positioned. The light, or the picture, will then be displayed in pixels on the front. The light source can be a projector emitting either pictures or film footage. In principle, the screen is capable of acting as a window since - owing to the combination of the screen concept's light-absorption and optical cables - it has a capacity for transmitting natural light.
But I still think that LiTraCon is even more awesome!