I'm almost not certain if you are being honest now or not... but I suppose it is possible that it is just more clear to me, already knowing the answer. :P
Not a screen of sorts (allowing for a reasonable application for "of sorts"). And while you can throw a battery, since you can hardly influence electrons constructively by yourself (let alone throw them), I think it would be pretty weird if my item turned out to be "An electron in a battery". I'm not that big of a meany! XD
What produces light and uses electricity, as well as fits the other criteria!?!?!?