| 摘要 |
A display device is describes which forms contained formed figures such as symbols, letters or numbers, ideograms, and which can be a sign, billboard, signal, message board, etc. Each figure is formed as a narrow but high projection which stands out of the external face of a sheet which permits the passage of light originating from a source behind the sheet. Each figure is surrounded by a sector of this same sheet capable of intercepting at least part of the light, so that the figure stands out in marked high relief. Also described is a mold particularly useful for production of the formed sheet, which includes a large number of very thin rigid straight rods, abutting one another within an adjustable frame, which are movable laterally among themselves in a slidable tight relation and able to stay locked among themselves by friction against sliding during vacuum or pressure molding.
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