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'[EE]: Wristwatch-sized Character LCDs? How do you'
2004\07\16@130015 by Richard Zinn

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I'm looking for LCD modules sized for wristwatches of pagers or other small
devices (6 to 8 characters).  I can't find them anywhere, but obviously they
are made by the millions yearly probably.  Are they custom made to order?
Or am I looking in the wrong places, using the wrong google search terms?

Thanks.

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2004\07\16@153716 by M. Adam Davis

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Walmart has a pretty good selection, reasonably price at $5-$10 each.
Some disassembly required :-)

The problem with this type of part is that its made by the millions, but
only sold by the millions.  Further they are not designed for easy
prototyping, so selling them one at a time makes little sense.  Are the
small ones sold by digikey (with through hole pin mounting) too big?

I wonder if they still use zebra strips to make the contact between the
circuit board and the display, it's been years since I took one apart...

-Adam

Richard Zinn wrote:

{Quote hidden}

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2004\07\16@155311 by Richard Zinn

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Do you mean the segment displays on digikey like the one here?
rocky.digikey.com/WebLib/Lite-on/Web%20Data/LTD-2601B%20II.pdf
Yeah, they are all too thick.  And I could tell by the smiley face that you
were jocking with your first remark, but what about that?  Would it be very
difficult to repurpose a watch LCD?  As far as getting the right connector
and then sending the correct signals to it?

Thanks.

{Original Message removed}

2004\07\16@155729 by Russell McMahon

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> I'm looking for LCD modules sized for wristwatches of pagers or other
small
> devices (6 to 8 characters).  I can't find them anywhere, but obviously
they
> are made by the millions yearly probably.  Are they custom made to order?
> Or am I looking in the wrong places, using the wrong google search terms?

1999 :-( but Google says:

spam_OUTalarie2TakeThisOuTspampo.jaring.my
Thu, 21 Oct 1999 00:55:40 -0700 (PDT)

I am an LCD manufacturer from Malaysia. We have 3 and 3 !/2 digit displays
and also others with icons. What are the future volumes we are looking at
and target unit price ?
Best Rgds, Alarie

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2004\07\16@232131 by M. Adam Davis

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I was half joking.  For many mass produced parts it is cheaper and
easier to buy consumer equipment and take what you want.  The main
problem being that it can be hard to get datasheets for it - taking a
calculator or watch apart is easy, making the electrical connections is
difficult, but finding out the proper signal routing is hard.  The use
of these parts can comprise an even more difficult problem in that it
may be hard to get the exact same part in any small or medium quantity,
and so have to do the investigative hacking all over again.  I went
through this with full duplex radio modules in cordless telephones -
they can be had for $19, but figuring out how to set them up to actually
send and receive audio or data was too difficult to justify the savings
over radios with data sheets, especially since the same model from a
manufacturer may use a different radio 3-4 months later.

In theory, each LCD segment forms a capacitor.  If you use a
sufficiently sensitive capacitance meter you may be able to tell the
backplane(s) from the segments.  At that point mapping it out may be
fairly straightforward.

You might consider a different lcd display, though. If you are merely
looking for a very thin display then head over to crystalfontz.com and
check out their ultra compact tab graphics displays.  The tiny ones are
under 2mm thick.  66.1 x 34.0 x 1.9 mm, just larger than a quarter.
Although I'm surprised to see that they consume 80mA, which might be bad
for your project.  Jameco sells a large graphics lcd that's about this
thin which consumes much less current - I wonder if this is a typo on
crystalfontz's part.

Well, good luck with your search!

-Adam

Richard Zinn wrote:

>Do you mean the segment displays on digikey like the one here?
>rocky.digikey.com/WebLib/Lite-on/Web%20Data/LTD-2601B%20II.pdf
>Yeah, they are all too thick.  And I could tell by the smiley face that you
>were jocking with your first remark, but what about that?  Would it be very
>difficult to repurpose a watch LCD?  As far as getting the right connector
>and then sending the correct signals to it?
>
>Thanks.
>
>{Original Message removed}

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