The metro stations, mostly underground, are characterized as being a long and narrow space with very low luminosity.
Here the teleindicators should always generate their own light, but without blinding, so that an appropriate solution is the use of LEDs.
Usually a tricolor array LED technology will be chosen because it allows the construction of graphic panels.
These graphic panels can display information in green, yellow and red. Using a matrix technology simplifies the electronics, because the LEDs in matrix share the same control lines.
Simplifying the electronics stands for a moderate manufacturing cost. Within the group of matrix LEDs there are different colours and luminosities available.
We use LED arrays with transparent resins which we complement with an ochre methacrylate front treated by sandblasting. May optionally be polycarbonate.