I don't think so.
You could make the display go black->white->black->white in an endless loop for a few hours, but I doubt it will help any...
If you have the ability to run scripts via telnet or something...
Code:
while :
do
/usr/local/Kobo/pickel showpic < /dev/zero
tr '\x00' '\xff' < /dev/zero | /usr/local/Kobo/pickel showpic
/usr/local/Kobo/pickel showpic 1 < /dev/zero
tr '\x00' '\xff' < /dev/zero | /usr/local/Kobo/pickel showpic 1
done