Quote:
Originally Posted by JSWolf
If only it was easy to pull out the CFA layer from the Libra Colour. Then we'd have a Libra BW.
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It's printed on top of the top of the eink top cover and then the light pipe layer "stuck" on. Next is the touch capacitive parts, which on an integrated panel will be partly deposited on the light pipe layer (probably tin thin enough to be transparent.
So, not easy and some printed inks don't easily dissolve in anything. I did industrial control panel screen printing for a while and once the ink set it wasn't removable. The screens had to be cleaned at once while wet and washing off the stencil was a pain too. It was soft, rollered on, exposed to UV via mask and backing peeled off. Then the unwanted portions washed off (I think where UV was blocked by mask).
We usually charged for a screen too in case we couldn't clean it. We gave it up. Too much work for small runs of custom control panels.
They might be "custom ink jet" printing the CFA (the coloured dots) as they are small for screen printing, but ICs are using 2nm smallest detail photolithography by ASML using short UV light.