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A comment on Sonder E-Ink Keyboard. Parent comment

Re:Sonder E-Ink Keyboard by TheOtherHobbes on Sunday October 30, 2016 @01:10PM (#12830895)
It's almost certainly a single display. Mini-caps would be expensive and very difficult to build reliably.

The e-ink displays I've seen aren't brilliant at black. It's usually somewhere between 50% to 75% gray. That may well be enough, but I think a lot of people are going to want to see a production sample before buying.

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Re:Sonder E-Ink Keyboard by SonderDesign on Monday October 31, 2016 @07:03AM (#12835716)
The contrast on the new displays are much better, the spec for E readers (encarta) displays are more forgiving given the application.

Mini caps would be expensive and also not a good look as each display has an IC driver bonded to the glass substrate so you would have this large border for each key.

I totally would want to get my hands / of fingers on one before selling too.

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