LCD for handset and 3D printing help needed

[Serg l]

So far it stays within the footprint of LCD. Here is a simple rendering
with dimensions
https://drive.google.com/file/d/18C59D6wkfz6w5kxejMQC2ls93uSuLQG_/view?usp=sharing

On Sat, Jun 2, 2018 at 2:13 AM, Mychaela Falconia <
mychaela.falconia at gmail.com> wrote:

> Hi Serg,
>
> > A couple of notes. Would it be possible to extend the spacer by 1 mm
> > outside of the LCD footprint?
>
> Do you mean extend by 1 mm total (extra 0.5 mm on each side), or have
> an extra 1 mm on each side?  I would hope that adding just 0.5 mm on
> each side should be sufficient - this way there is a full 1 mm of
> outer wall at the points where the alignment pins go in.  Or do we
> need even more outer wall at those points?
>
> > On the inside at the bottom legs it will be
> > just 0.4 mm wall for the pin, with +/-0.1 mm precision it is too close. I
> > was thinking that making a notch instead of a hole would be a better
> > option. This way I can have reasonable margins on outer side.
>
> Yes, with my original idea the inner wall at the bottom pin hole would
> only be 0.2 mm or so (if we leave another 0.2 mm of margin), so that
> inner wall would essentially disappear at the widest point of the hole.
> You are saying to just replace the hole with a notch, right?  Probably
> a good idea.
>
> > I have done a quick draft, does it look like a good candidate?
> > https://drive.google.com/file/d/1Xd6pzuXVFUHUF1dC9Sl3Gq-
> ViYBu-rKJ/view?usp=sharing
>
> Unfortunately I am a cave-dwelling neanderthal and have no idea what
> to do with an STL file. :(
>
> > How much space do we have under the LCD
>
> I don't understand the question.  Without the proposed spacer under
> consideration, there is essentially zero space under the LCD module if
> it is pressed against the PCB - the module is misdesigned in my
> opinion.  As to how much space under the LCD we need to *create* by
> way of our spacer, my target is 1.5 mm, so we can accommodate a Molex
> 51296-4594 connector for the FPC tail (1.30 mm height above the PCB,
> the thinnest I could find that is compatible with this LCD module's
> tail configuration) with a little bit of margin.
>
> > and can we have the spacer sticking
> > outside of the screen footprint?
>
> Yes, we can make the spacer footprint extend a little wider than the
> 38.40 mm width of the LCD module, but we should only extend it as much
> as absolutely necessary.
>
> > I made it 2 mm wide
>
> Does it mean that the inner edge of each wall coincides with the
> innermost point of the alignment pin on that side while the outer edge
> of each wall extends 0.5 mm past the outer edge of the module shell?
>
> > and 1.5 at the bottom
> > to accommodate the flat cable.
>
> We need the space not so much for the flat cable (FPC tail), but for
> the PCB-mounted connector into which this FPC tail will need to go.
>
> At this point the most effective way for you to help this project
> would be to receive a physical LCD module from me and start
> experimenting with it hands-on.  Where should I send it?
>
> M~
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