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Braille display using static charge

 Create a high density array of contacts connected to tiny capacitor arrays to allow blind to feel characters or any grey scale image
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Pretty much covered in the title. The "display" could be used in phones or any other interfaces for the blind. The amount of charge could be altered to relate the amount of "darkness" of that point.
—MisterQED, Jun 03 2010

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       Wouldn't this hurt?
—5th Earth, Jun 04 2010
   

       How do you convert the charge on the capacitors into something people can feel?
—MaxwellBuchanan, Jun 04 2010
   

       // Wouldn't this hurt? //   

       You say that like it's a bad thing.   

       // something people can feel ? //   

       See above.
—8th of 7, Jun 04 2010
   

       You'd definitely need something analogous to a brightness control to vary voltages based on skin types. My guess is you'd end up using high voltages (~100V) with no amps. This should give a slight tingle but not anywhere near painful.   

       I guess unless you want it to be....
—MisterQED, Jun 04 2010
   

       This may work, but I doubt it. For one thing, the electrical conductance of the skin depends hugely on dampness and on pressure. For another, braille users rely on the light-touch sensors in the fingertips, which are very densely packed. This system might stimulate these receptors, but I think it's more likely to trigger other receptors which are not so densely packed (eg, heat, pain).
—MaxwellBuchanan, Jun 04 2010
   


 

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