Re: [CAD_CAM_EDM_DRO] LCD or LED DRO Readout.

I don't see why current consumption of LEDs should be a problem for us - we
are, after all, talking about using the DROs of machines with power fed to
them and a small 'wall wart' typr power supply will power a lot of LEDs.
Also, LED matrices are now available reasonably easily or, for the home
constructor, bags full of individual small LEDs are available at give-away
prices (200 LEDs for 1UKP at a local store last time I was in) and so it
would be a practical proposition to make a display which would give several
lines of text or graphics like a small version of the scrolling advertising
displays which were common a few years ago. As to current consumption, this
does not have to be high (yes it will be more than an LCD display but these
are almost unreadable in many situations) as 'time division technology' can
be employed where each LED is only illuminated for a fraction of a second
(maybe 1/25 second as in movie films). On a panel type of display this would
usually be done by lighting all the LEDs in a vertical row for 1/25 sec and
then lighting the row next to them and so on. So for a quite large two-row
display of say 750 LEDs, only a maximum of 30 need be illuminated at once
and probably far fewer if higher 'flicker rates' are employed.
Just my 2p.

Best wishes,
Ian
--

Ian W. Wright
Sheffield, UK

----- Original Message -----
From: <JanRwl@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, July 23, 2002 3:40 AM
Subject: Re: [CAD_CAM_EDM_DRO] LCD or LED DRO Readout.


> In a message dated 22-Jul-02 02:43:49 Central Daylight Time,
> peter.homann@... writes:
>
>
> > My gut feeling is that a LED display is going to be easier to read in
the
> > workshop, although a LCD display is a lot more versatile.
>
>
> No.
>
> LED display is easier to "power up", but uses much more current. An LCD
> display with matching driver, assuming you "know how to connect it all",
will
> run on microamps (see wrist-watch, or most digital calipers that run five
> years on one "aspirin-sized cell").
>
> In bright lighting, the LCD is perhaps better. In a dark "corner of the
> shop", nicely-made LED displays can be easier to read. BUT, even the most
> efficient LED readouts hog current, SO are not candidates for
battery-supply,
> etc.
>
> A matter of "whatcha gotta DO at the moment". Or, what "surplus leftover
> parts" you happen to have on-hand!
>
> Jan Rowland, Yank Troll
>
>
> [Non-text portions of this message have been removed]
>
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