Screen provided with retroreflective microstructures

Retroreflective screen comprising a film having a surface comprising a plurality of microrecesses, each microrecess having a shape of a truncated pyramid comprising first, second, third and fourth lateral walls corresponding respectively first, second, third and fourth lateral surfaces of the truncated pyramid, and a back surface parallel to the mean plane of the screen, corresponding to a summit surface of the truncated pyramid, wherein:

• in each microrecess, the first and second lateral walls are orthogonal to each other and orthogonal to the back surface;
• and
• the first, second, third and fourth lateral walls and the back surface of each microrecess are coated with a reflective metallization, wherein:
• A) the screen is divided into a plurality of cells of same dimensions arranged in an array of rows and columns, each cell comprising a single microrecess and the microrecesses all having the same dimensions, the positions of the microrecesses within their respective cells varying according to a random or pseudo-random distribution, or orientations of the microrecesses within their respective cells varying according to a position of the cell in the array;
• or B) the screen has a plurality of areas, each comprising a plurality of microrecesses, the microrecesses of a same area being of the same dimensions and the microrecesses of different areas having different dimensions.