I've come up with solution that's easy, repeatable and
looks great. In the next day or so I'll organise pictures

I took a piece of 2mm acrylic and covered one face, one
end and both long sides with adhesive aluminium foil. The
open face is under the LCD. A dab of clear silicone should
be enough to hold it. A 5mm white LED is shone into the
open end. The effect is an even, cool blue-ish light. Looks
"just like a bought one". "on" segments stand out very well
and "off" segments can't be seen at all. Tried it with super-
bright red and green but white is better. Got some coloured
film around here somewhere, will try that over the powerful
white LED rather than a less powerful coloured LED


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