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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Hi all.
I finally got one of those Esquire e-paper screens. Here's what you do to modify them for individual segment activation.
1) Separate the back foil and paper, you wil see the rear contacts.
2) Where the segments attach to the front is shown by small holes in the backplate
3) Sever the connections between segments and then bring them to the side using silver paint
4) If you are cutting down the display for multiple segments you will additionally need to separate the central layer from the front and stuff a piece of wire into here, test then seal with soldering iron
4a) Alternate connection method, separate back layer from front, scrape off rubbery elastomer, glue down with superglue and then attach wire to back contact. as 3), depending on how well you did this you may also want to seal out the exposed transparent top contact with superglue as well, this gives you an extra large segment if you are using the rotary area of the car display.
4b) Yet ANOTHER alternate connection method suggested by someone at work, "drill" a divot in the back elastomer and then drop a small droplet of silver paint into the "hole". This works fairly well, but if you overdo it you risk a short on that section.
5) Test using 9V battery, if display segments correctly switch then all is well. I also tend to measure from each point to the wire contact, should measure o/c if no silver migration or shorting present.
6) When all works well, seal edges with soldering iron on LOW heat and then hold together with epoxy on the back, this should reduce or prevent seepage of the carrier oil. This is VERY IMPORTANT, if you don't do this then you will have dead spots where the interconnects are, spreading slowly outwards after a few days.
If you have remaining pieces of e-paper, I advise putting them in a sealed bag or box with some silica gel to suck up any moisture in case you want to use them later.
If you have an intact display there is a neat way to do long thin "strips", use a razor blade to deeply score the elastomer without damaging the edge connector or front contact on the left hand side. Depending on how careful you are this can give you up to 16 independent segments with a possibility of a partial matrix display if you score areas vertically as well, then interconnect areas as 4b) and you will be able to switch segments together with a very small gap between them, and also avoids the edge wire stuffing trick neatly. I found that gently bending the e-paper sometimes helps here.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Additional pictures :)
You might also want to use a small piece of carboard to reduce the thickness of the epoxy layer on the back so the resultant sandwich is somewhat flexible...
Glue used:- Unibond Plastic Repair, seems to work well. Try not to overbend the e-paper while scoring or you will have dead spots on the lines.
I have run mine up to 50V and it worked, YMMV. Best results obtained with freshly peeled sheet, sealed in epoxy as soon as possible.
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E-paper hackery
