Can an iphone charger affect the iphone?

So my ipod touch has been doing this thing where i'm just using it as normal and then suddenly the screen goes really bright--like whitewashed. I can't see a thing, even on lowest possible brightness. Yesterday night i used my sister's charger instead of my own, and now it's working fine. Should i get a new charger?

Added (1). no, that's not what I mean… The screen starts to flicker, and then it becomes whitewashed. Like if you took a picture on photoshop and changed it to the highest contrast or brightness. You can see the colors, but it's just really really light.

Check your settings- your screen may get brighter if it is plugged in. Uncheck that and try again.