Peter, Thanks for taking the time to take a measurement of your display. You are right. The clamping tabs don’t allow a great deal of adjustment (or clamping force — more on this).
The manufacturer recommends 10% compression, with 5% compression minimum. This compression percentage has to take into account a +/- 0.127mm manufacturing tolerance for the zebra strip, as well as any tolerance stackup from the bezel and glass. Unless someone has manufacturing drawings for the glass and bezel (could we be so lucky?) The best we can do is measure a number of displays and see where they fall. My display measured 3.3mm glass-to-board (measurements of individual parts disassembled, assembled dimension by averaging and subtraction). After conversation with the manufacturer's technical guy, he suggested the 3.74mm dimension used for the first prototypes based on his experience and our application. These first tests suggest we might need to be closer to a 5% squeeze, especially in light of the measurements you took of your display. I’m optimistic we can find a dimension that hits the sweet spot for all or nearly all of displays in existence. It will just some displays and some work. I won’t place a full order until its pretty clear we’re on the right track. Thanks again for taking the time to take the measurements. Out of curiosity, how did you take your measurement? Is anyone else wiling to take the same measurement? —Jamie On Jul 15, 2021, 8:00 PM -0400, Peter Noeth <petern0...@gmail.com>, wrote: > Since we don't know the uncompressed height of an OEM strip, we may have to > rely on the vendor's recommendation based on compressed height and their > materials / process. The clamping tabs on the metal frame do not allow for a > great deal of compression distance, so the tolerance of the strips may have > to be rather tight. > > On a M100, with a working LCD, that I have apart right now, I measure the > compressed height of 3.02 to 3.09mm at the accessible corners of the glass. > You should relay this measurement to your vendor to get their recommendation > for uncompressed height. > > Regards, > > Peter > > > > > > > ----------------------------- > > > > > > Message: 4 > > > Date: Thu, 15 Jul 2021 18:37:14 -0400 > > > From: Jamie Nichol <jgnic...@gmail.com> > > > To: "=?utf-8?Q?m100=40bitchin100.com?=" <m...@bitchin100.com> > > > Subject: Re: [M100] New zebra strips for M100 > > > =?utf-8?Q?display=E2=80=94_?=any interest? > > > Message-ID: <8845c77c-aa11-4eca-8280-9231abb52ee9@Spark> > > > Content-Type: text/plain; charset="utf-8" > > > > > > Guys, > > > > > > <snip> > > > > > > Based on testing so far, it looks like the manufactured height of the > > > zebra strips should be 0.3mm shorter than the first prototypes. It seems > > > like 3.4mm manufactured height is pretty close to right. > > > > > > Before placing a more serious order, I want to be sure the zebra strips > > > are generally likely to work, so I?m renewing a call for test displays. > > > > > > <snip>
