I love that blue display, reminds me of my Passat I used to have. Blue seems to a great colour for digital displays.
Blue is weird. In many ways it’s actually a terrible color for displays, especially pure (monochromatic) blue, like most blue LEDs, since that’s the lowest-contrast primary color, as our eyes are the least sensitive to it. That’s why blue LED displays are so annoying. But VFD blue is not monochromatic, it’s usually closer to teal, so it contains a lot of green and a bit of red, too. So it can be excellent.
That's strange I always that that blue was the colour that human eyes are sensitive to and hence why emergency vehicles tend to have blue lights on them?
The blue colour of emergency vehicle lighting is somehow related to the little fuss our countries had nearly 80 years ago...
In Germany, the blue light was introduced in 1933. In order to meet the requirements of air-raid protection (blackout), the police vehicles were then specified to be equipped with blue light, since blue light has the
highest scatter in the atmosphere and was therefore not visible to bombers at high altitudes.
In the same year, the fire brigades were equipped with the blue light, too.
The introduction of the flashing light or the rotating beacon instead of a calm glowing light was only in the 1950s.
Much more important today: The blue colour is not used in any other traffic sign or lighting.
Therefor very easy and fast recognizable.