Here is an explanation of the numbers.
1 Upper layer
2 Transparent electrode layer
3 Transparent capsules (pixels)
4 Positively charged white pigment beads
5 Negatively charged black pigment beads
6 Transparent oil (the gunk)
7 Electrode pixel layer
8 Bottom supporting layer (repelling or attracting)
9 Ambient Light
10 White "print"
11 Black "print"
Simple, isn't it? The system has one big advantage over the usual computer or phone screen. It uses very little power. This means that a solar panel can drive it even if the skies are cloudy.
The system has a disadvantage as well, namely that its "refresh rate" is poor compared with its techy superior brothers.
Scrolling text or pictures is not good. Effectively your best option is to switch the signal off and "create" a new page. Experiments with full or partial colour have not yet been entirely successful.
And here's one set up to replicate a London Buses "panel" departure list.
But now to Chesterfield where we return to the real world of bus stop information.
These pictures were taken on Sunday last three weeks after the timetable change about which they (Derbyshire County) are/are not informing their passengers.
Here is the current display at stop B14 on New Beetwell Street.
These have been crossed out using one of those rather strange sticks with ink in it (called a "pen") with which, apparently, you could once create and edit text (it was called "writing") and even draw diagrams.
Not only have the headings been "crossed out" (another technical term from days past) but the computer system has delivered an unhelpful list of departures in time order, when, as we know, the passenger wants this list in route number order.
PINK and PALE ORANGE times from this frame.
No one seems to know how or why computer technology failed so profoundly in this case but we do know what has happened to the deleted information.
fbb will conclude this tale of high tech versus very low tech, expensive computer systems versus a ball point pen ...