I measured at the four corners of the metal frame, where the LCD glass / Zebra Strip / PCB connection can be seen and accessed, with a dial caliper. The measurements varied between 3.02 to 3.09mm at these points. The mid points of the length of the Zebra Strip could not be accessed, but should be similar in range to the corner measurements as the glass is flat.
One must also consider the effects of uneven thermal expansion of the display assembly, to ensure that there is enough pressure exerted by the Zebra Strip to the PCB and LCD glass. I would also think that an "assembly jig" would need to be created, to keep the PCB and metal frame aligned during the twisting of the metal frame tabs. On smaller displays I had worked on, we had such a jig that allowed viewing the LCD powered on, while setting the tabs, so as to ensure the Zebra Strip was making good connection along its entire length and there were no "dead areas" on the display. It was more helpful this way as opposed to setting the tabs, then testing the assembly and adjusting for any bad spots on the display. The tabs usually didn't take to being bent more than two or three times. Regards, Peter > ------------------------------ > > Message: 5 > Date: Thu, 15 Jul 2021 20:57:25 -0400 > From: Jamie Nichol <[email protected]> > To: Model 100 Discussion <[email protected]>, > [email protected] > Subject: Re: [M100] New zebra strips for M100 > Message-ID: <b4c15b6a-2afd-4e87-b61c-93d4e26233de@Spark> > Content-Type: text/plain; charset="utf-8" > > 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). > > <snip> > 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 <[email protected]>, 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 > > > >
