Touchscreen requirements

John Watlington wad at
Tue Jun 8 22:01:40 EDT 2010

On Jun 8, 2010, at 2:28 PM, C. Scott Ananian wrote:

> On Tue, Jun 8, 2010 at 9:23 AM, John Watlington <wad at> wrote:
>> An interesting effect I've noticed is that with some touchscreen, you get smooth
>> lines when moving your finger at a "normal speed", say 8 cm/s, but when you slow
>> down (1 cm/s) the line wiggles around.
> See
> "Strength" of touch also matters a great deal, and there's quite a bit
> of fudging being done in the hardware tracking algorithms.

Great study.

What was interesting about that study is that they conflate
"strength" with finger size.   On a PC touchscreen these might
be the same, but it implies that with kids we will universally
see the crappy results of "light touch".

Time to find a small finger for testing demos...

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