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Speaker 1: with today's question. How does an indo glow watch work.
Speaker 1: The basic technology behind the indo glow watch is called electroluminescence.
Speaker 1: Electroluminescence is the conversion of electricity directly into light. This
Speaker 1: is not how an incandescent ball works. In an incandescent ball,
Speaker 1: the electricity produces heat and the heat produces light. Electroluminescence
Speaker 1: is much more efficient because it converts the electricity directly
Speaker 1: to light. The most common example of electro luminescence that
Speaker 1: we see on a regular basis is a neon sign.
Speaker 1: In a neon sign, high voltage energizes the electrons and
Speaker 1: the neon atoms and they emit photons. In an indiglow watch,
Speaker 1: a very thin panel uses high voltage to energize phosphor
Speaker 1: atoms that produced the light. The panel itself is incredibly simple,
Speaker 1: as described in the time x patent. You take a
Speaker 1: thin glass or plastic layer, you coat it with a
Speaker 1: clear conductor. You coat that conductor with a very thin
Speaker 1: layer of phosphor. You coat the phosphor with a thin
Speaker 1: plastic and then you add another electrode. Essentially, what you
Speaker 1: have is two conductors or a capacitor with phosphor in between.
Speaker 1: When you apply one D two hundred volts a C
Speaker 1: to the conductors, the phosphor energizes and it begins emitting photons.
Speaker 1: Creating that high voltage can be a problem in a
Speaker 1: wrist watch. The watch only has this little one point
Speaker 1: five volt battery inside it. To produce the one two
Speaker 1: hundred volts, a one to one hundred transformer is used
Speaker 1: by charging the primary coil of the transformer with a
Speaker 1: transistor that's switching on and off very rapidly. The secondary
Speaker 1: coil rises to a hundred fifty volts or so. You
Speaker 1: apply that to the panel and the panel starts to glow.
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