This is a neat little electroluminescent (EL) driver board. It uses the HV857 lamp driver IC and only 7 external parts. The PCB board is only 12mm square, and it runs off of 1.8-5v DC. It would run fine of a couple batteries. It's not the brightest and don't expect it to light up a long strip of EL tape or anything. It works good for smaller LCD backlights and such.
PC board layout if you want to make your own! Also, here's a mouser parts list if anyone is interested. Also also, here's the eagle files I made for this project.
Guts of my QY10 with the EL board installed
QY10 backlight action. Yay!