Electroluminescent Display aging - Was : Re: Flat panel display rot - "tunnel vision" in electroluminescent and other displays- bad seals.

[Ian Finder]

Update: I've swapped the displays and drivers around, and the "tunnel"
effect seems to be a property of the panel and not drive electronics.
Perhaps they are all high-hour examples?

Anyone here an electroluminescent display expert?

>
>
> 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> wrote:
>>
>>> 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:]
>>> > http://www.ripstick.com/USCM/images/Grid_Compass_1101_
>>> Laptop_in_Box_002.jpg
>>> >
>>> > 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
>>> picture
>>> > 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
>>> tips?
>>> >
>>> > Could it be reversed?
>>> >
>>> > Better yet, does anyone have ideas on how to rapidly dehydrate the
>>> display?
>>> > Perhaps there is even a way to re-seal them.
>>> >
>>> > I think all two-glass-pane displays that don't have a vacuum may
>>> eventually
>>> > 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
>    (206) 395-MIPS
>    ian.finder at gmail.com
>
>


-- 
   Ian Finder
   (206) 395-MIPS
   ian.finder at gmail.com