Hi,
I´m thinking in do a LCD-pen with arduino mini, but i can´t found a one-line LCD that will fit in a pen.
I´ts possible the combination of one arduino mini, and LCD and a microSD card?
Thanks.
Sure - uSD card needs SPI port, LCD's are available in all kinds of configurations, mini has plenty of IO pins left to support one.
check newhavendisplay.com, may have something small enough to fit your needs, or give you leads on other places to search.
There are quite a few LCDs of the size you're likely looking for (though, you should define exactly how small you're talking... Any pen that would hold a mini is too large for my (large) hands already.
That said, the biggest issue you'll find is that the vast majority of these very small displays will come either without controllers that have Arduino libraries pre-written or will come without controllers period. This would mean a pretty serious effort on your part to get the screen displaying anything.