At 09:58 PM 8/31/97 +0200, you wrote:
>>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".

I believe these EL systems use the parts from Sipex.  These are a good
solution in an 8-pin SOIC with minimum external parts and decent efficiency.