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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
Hi all.
OK now this is really weird science but makes sense. On a hunch I tried to configure a piece of e-paper from the Esquire magazine so that the 51mm * 34mm piece was one solid unit then encased in Epoxy so that moisture couldn't get in. Note, measures around 100K across paper which is unusual...
Measured with my Peak Atlas at peak black and peak white. As I expected there is indeed a difference in capacitance, from 1.900 nf fully black epaper to 1.916nf fully white.
Also evident is a more or less linear change in capacitance if I pulse it weakly so that it has intermediate levels of blackness.
I enclose my table of results. I added a series 3300pF capacitor as there are some effects on the Peak Atlas from DC offsets present on the "capacitor".
Prepared epaper by holding 9V across it for 10 seconds and taking readings at 5 second intervals.
Fully white 1.555nf 1.553nf 1.555nf 1.554nf 1.552nf
This does indeed tally in with my hypothesis that the effect is due to the microscopic particles affecting the permittivity of the dielectric, by changing its density. In addition it looks like the effect takes some time to settle, as the charges dissipate within the various layers.
For comparison, I have replaced the capacitor woth a 47pF 3kV ceramic and tried the original unaltered car display.
Fully white 18v 22.4pf 21.5pf 22.7pf 21.8pf 23.0pf mean 22.28 pf
intermediate grey 1 22.7pf 21.9pf 21.5pf 21.4pf 22.4pf mean 21.98pf
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
hi all.. I am going to compare an unaltered "future" display as well. seems that there is also an effect with temperature..
Another idea might be to paint the "visible" side with silver paint and make this a common electrode with the back plate, as this could increase the effect and also help shield the device.
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Weird science:- Variable memory capacitor
