| 主权项 |
1. A display device for displaying information comprises:
a display body having a front side and rear side and comprising at least one cavity between them, wherein the cavity being connected in a closed fluid circuit comprising: supply fluid lines, return fluid lines, and a fluid reservoir, the circuit being suitable to contain a coloured fluid, the cavity being shaped to form symbols representing the information to be displayed, and a pump for circulating coloured fluid in the fluid circuit to supply the one or more cavities with coloured fluid and return fluid to the reservoir from the cavities. |
