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LCD equivalent, digital numeral version also under
development. |
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The LCD version would actually be easy, and quite cool.
You would use Peltier elements as the sections of
numbers. You paint them black and then selectively cool
the sections of numbers you want to show up. If the
ambient humidity is high enough*, your number sections
will gain a layer of white frost. When you want the
sections to disappear, a brief pulse of reverse polarity
current will heat the sections and melt off the frost. |
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* if it isn't you could get around that with a small case
with controlled humidity |
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