Subject:
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Re: LCD screen
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 22 Jan 1997 19:19:47 GMT
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Original-From:
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Curt Mills <hacker@STOPSPAMMERStc.fluke.com>
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Viewed:
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1173 times
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On Jan 22, 8:20am, Garth Webb wrote:
> Subject: LCD screen
> After turning on my handy board after some traveling with it (and
> loading IC, etc) I have found that the contrast of the screen is very high.
> If looked at straight on the screen looks black (well, all black squares),
> but if looked at from an angle, one can make out the "Interactive C,
> etc...". I recall someone saying that there wasnt a way to change the
> contrast on the LCD. What could have happened and is there any way I can
> remedy this situation?
I ended up with a display that did this very thing (A Rolm display I think),
and what I did was to cut the contrast lead coming out of the LED connector,
and then solder a 20k pot to the GND, +5V, and Contrast leads so that I could vary
the contrast myself. The contrast lead goes to the wiper/center/variable lead
of the pot. I glued it right to the edge of the display.
As I recall, the contrast lead is connected straight to ground on the Handyboard,
which works fine for most displays, just not for mine. My display had that
problem when new BTW.
Curt, WE7U.
hacker@tc.fluke.com
archer@eskimo.com
we7u@we7u.ampr.org
http://www.eskimo.com/~archer
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