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 <[email protected]> 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 <[email protected]> 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 >> [email protected] >> >> > > -- > Ian Finder > (206) 395-MIPS > [email protected] > > -- Ian Finder (206) 395-MIPS [email protected]
