On 9/16/23, Paul Koning via cctalk <[email protected]> wrote: > >> >> I want to guess it was individual digits back-projected - which was a >> popular control-theater display tech at the end of the 20th century - but >> I can't rule out, say, really well-done edge-lit character plates. In any >> event there doesn't seem to be any visible jitter up and down between >> digits that I might expect with either of those technologies. > > I would make the same guess. They look a bit like the IEE "In line display" > numeric projection displays that were popular in the 1960s. I have a > couple, they are very nice high quality (very readable) numeric displays > using a set of mini-projectors each with its own incandescent lamp to > project a digit onto a frosted glass (or plastic) screen. > https://www.industrialalchemy.org/articleview.php?item=511 > > The Concorde displays are not those exact units but they may well use the > same technology, or perhaps even use a custom-made variant. > > paul > > >
In this video <https://www.youtube.com/watch?v=YeEB2Lxbfa4>, they definitely appear to be some kind of video displays, since they show graphics before takeoff and have a very noticeable refresh. These almost certainly were a later addition, presumably replacing the 7-segment displays that Tim mentioned (which can be seen at <https://www.flickr.com/photos/peterdenton/2380507590>).
