Flat panel display rot - "tunnel vision" in electroluminescent and other displays- bad seals.
ian.finder at gmail.com
Wed Jul 20 18:35:34 CDT 2016
Hmm. I suppose recapping is a logical next step. There are also four
adjustable inductors and a single trimpot inside the display assembly.
I haven't been able to find a single clue about what they do.
On Wednesday, July 20, 2016, Ian Finder <ian.finder at gmail.com> wrote:
> No, I'm not convinced the EL repro isn't a driver electronics issue.
> I'm just a little confused about why the issue congregates at the edges of
> the displays. Any ideas why that might be?
> I may try swapping the panels around this evening if I am feeling brave.
> On Wednesday, July 20, 2016, Brent Hilpert <hilpert at cs.ubc.ca
>> On 2016-Jul-20, at 12:52 PM, Ian Finder wrote:
>> > I have a few GRiD compass systems and some are suffering from massively
>> > decreased contrast on the edges of the displays:
>> > [See the system on the left]
>> > https://www.instagram.com/p/BIGGzUzgat-/?taken-by=tr1nitr0n
>> > [Or this one:]
>> > Meanwhile, other EL systems I have- like my HP integral PC- haven't
>> > succumbed to this.
>> > I have seen similar issues on amLCD displays in my Tadpole, Toshiba and
>> > other machines, so this is something we all may have to confront.
>> > -------
>> > I was wondering if the folks here had theories?
>> > I'm thinking moisture (or air) might be leaking in from the edges of the
>> > glass panes, perhaps from a compromised seal- sorry for the silly
>> > but you can see the composition of the display here:
>> > https://www.instagram.com/p/6BXaLBtSzd/?taken-by=tr1nitr0n
>> > Does anyone know how one might prevent this from progressing- storage
>> > Could it be reversed?
>> > Better yet, does anyone have ideas on how to rapidly dehydrate the
>> > Perhaps there is even a way to re-seal them.
>> > I think all two-glass-pane displays that don't have a vacuum may
>> > succumb to this.
>> > Perhaps it is just oxidation and not moisture, but I'd love to hear any
>> > theories.
>> Are you convinced this is a panel problem rather than a driver
>> electronics problem?
>> In one picture it looks like the sort of thing that happens when you have
>> to turn up the brightness (for some types of display), resulting in partial
>> illumination in other areas of the screen.
>> I've never had opportunity to repair or work on EL flat-panel displays,
>> I'm not familiar with the driving techniques and requirements, so this is
>> just a query/guess. (I see it's an X/Y matrix drive scheme, but the
>> voltages & timing & phasing I don't know about.)
> Ian Finder
> (206) 395-MIPS
> ian.finder at gmail.com
ian.finder at gmail.com
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