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PICList Thread
'[OT] LCD abuse'
1999\01\18@162234 by Eisermann, Phil

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part 0 1437 bytes
a customer wants to add an LCD module
to a hand-held power tool. I am
concerned that the LCD will not
stand up to the abuse it will be
subjected to. Does anyone know
of any exisiting industrial products
that use LCD displays? Something
that gets heavily abused, thrown
into the back of a truck, gets run
over by the occasional pickup truck,
and perhaps accidentally dropped from
the ladder....

my gut feeling is that the LCD is
not a good idea (but then i have
never put one in a product).

for reference, this tool *will* see
heavy abuse. for one thing, it will
be used by plumbers and contractors
in the construction market (the ones
who put up buildings). for another,
my company is called "Ridge Tool"
If you've never heard of us, you're
not in the plumbing business! why
is this important? Ridgid
quality/robustness is legendary. All
our products carry lifetime guarantees.
people expect to be able to abuse our
tools, and have the tools live through
it.

if you're still reading, you must
be curious: the background is a little
complicated right now, and i am not
allowed to tell you anything :) the
"customer" isn't yet official, there
are legal (patent) issues, and there
is a little trouble with their current
supplier, who apparantly has had some
sort of internal dispute and split off
into two competing companies... please
forgive me if i cannot say anything
specific. (it is much like a soap-opera)




1999\01\18@163104 by Morgan Olsson

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1) Densitron have plastic LCD:s
Lightweight & somewhat flexible.
http://www.densitron.co.uk/

2) Use replaceable polycarbonate window.
(Polycarbonete is *very* tougth, but easier to scratch than acrylic.)

3) Mount display and electroniv oan rubber supports

My three ores

/Morgan

At 16:15 1999-01-18 -0500, you wrote:
>sorry for the OT question. But the
>LCD would be controlled by a PIC :)
>
>a customer wants to add an LCD module
>to a hand-held power tool. I am
>concerned that the LCD will not
>stand up to the abuse it will be
>subjected to.

       Morgan Olsson                   ph  +46(0)414 70741
       MORGANS REGLERTEKNIK            fax +46(0)414 70331
       H€LLEKS           (in A-Z letters: "HALLEKAS")
       SE-277 35 KIVIK, SWEDEN               spam_OUTmrtTakeThisOuTspaminame.com
___________________________________________________________

1999\01\18@170018 by paulb

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Eisermann, Phil wrote:

> a customer wants to add an LCD module to a hand-held power tool.  I am
> concerned that the LCD will not stand up to the abuse it will be
> subjected to.  Does anyone know of any exisiting industrial products
> that use LCD displays? Something that gets heavily abused, thrown
> into the back of a truck, gets run over by the occasional pickup
> truck, and perhaps accidentally dropped from the ladder....

 I sympathise, and my father-in-law is a (retired?) plumber so I am
quite aware of your company.  Somewhat more expensive tools for those
who "are through playing games".

 My anxiety, as well as the impact resistance you stress repeatedly,
would be the endurance under extended temperature range (about 70¡C or
worse) and prolonged sun exposure.  I'm sure LCDs have improved since
first introduced, and are used in a similar application; automotive
clocks, but a 10 to 20 year lifetime under those conditions sounds a bit
steep.

 LEDs have readability issues in direct sun, as do vacuum fluorescents.

 I don't have design experience here, only customer observation.  I
shall find the answers interesting!
--
 Cheers,
       Paul B.

1999\01\18@184850 by Mike Morrin

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At 04:15 pm 1/18/99 -0500, Eisermann, Phil wrote:
> Does anyone know
>of any exisiting industrial products
>that use LCD displays? Something
>that gets heavily abused, thrown
>into the back of a truck, gets run
>over by the occasional pickup truck,
>and perhaps accidentally dropped from
>the ladder....

My cellphone has had most of the above abuse, (haven't run over it yet...)
and the LCD is still going fine.

regards,

Mike

1999\01\19@225045 by Thomas McGahee

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If you want to make the LCD module fairly
indestructible, make sure you cover the
display with an additional clear plastic
cover... preferably something like
plexiglass or polycarbonate. The modules
normally get damaged when the faceplate is
pressed upon too hard and they break.

Fr. Tom McGahee

{Quote hidden}

1999\01\19@230941 by Sean Breheny
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Hi all,

Dremel is now making one of their moto-tools with a small (2 char) LCD to
indicate RPM. It is on their USD $200 professional model, too.

Sean



On Tue, 19 Jan 1999, Paul B. Webster VK2BZC wrote:

{Quote hidden}

1999\01\22@164418 by John Payson

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|3) Mount display and electroniv oan rubber supports

Depending upon the package, you may want to use less-than-complete
mounting between the package and the LCD.  Many LCD's may be cracked
easily by torquing; if you screw all four corners of the display to
the board and the case, then any pressure on one corner of the dis-
play may twist and crack the LCD.

By contrast, if you mount the two corners adjoining the connector
solidly, the display might not be as firmly mounted but only direct
pressure on the display itself would be likely to crack it.  If you
put a window in front of the display, the display itself should be
nearly indestructible.

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