I just wrote this mail, and I wish to add it this link
to the product I'm talking about...

http://www.mot.com/SPS/MotorolaPowered/timex.html


gael

Message-ID: <3409CCE1.474E@easynet.fr>
Date: Sun, 31 Aug 1997 21:58:25 +0200
From: Gael WAICHE <gwaiche@easynet.fr>
Reply-To: gwaiche@easynet.fr
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To: pic microcontroller discussion list <PICLIST@MITVMA.MIT.EDU>
Subject: Re: backlighting LCD's
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>Is the Timex Indiglo an EL display?  If so, how do they power the
>inverter off those small lithium cells?  It's the only digital watch
>lighting system I have any time for <g>

I have been told that those watches use a chip Motorola designed
a few years ago. It is able to raise the voltage delivered by
the battery with an efficiency which is far better than the one of a
coil based system to feed the EL backplane.

Just for notice, Casio offers now in most of its wrist watches
a system similar to Indiglo called "Illuminator".

Gael