| 摘要 |
The informative sign board has a light fitting and contains a first sign board material with a bottom structure to which at least one colored layer is applied. It incorporates a board or panel for the system, a light box in which is a light source, in relation to the board. The board has a second material applied to the first material. The first material is more prominent to an observer when the light source is illuminated than when it is extinguished. |
