| 主权项 |
1. A billboard display system comprising:
a light source housed in a cuboid structure, the cuboid structure defined in part by a front wall and a rear wall displaced apart from the front wall, wherein
the rear wall admits passage of light therethrough,the front wall is non-transparent, preventing passage of light therethrough, andthe front wall defines indentations extending inwardly from the front wall, each of said indentations has a bottom, the bottom connected to the rear wall, the bottom of the indentation defining an aperture that extends through the front wall and the rear wall without admitting light into or out of the cuboid structure from the perspective of a viewer looking at the front wall, other than through the aperture; a sheet of projection film on which is printed a grid-like array of images, wherein each image in the grid-like array of images has a spot that is optically clear and centrally located on the image, said spot being approximately the same size and shape as the aperture, and each spot being centered on each such aperture, the sheet of projection film being adjacent to the rear wall outside the cuboid structure; and a concave mirror for each image in the grid-like array of images, each concave mirror centered on the aperture below the image and positioned above the sheet of projection film and configured so that light from the light source housed in the cuboid structure passes through the rear wall, thence through the image and then is reflected off the concave mirror and through the aperture so as to form an emission of light out of the indentation. |
