How to fix my iPhone? Application windows are tiny?

So I have an iPhone 4S and it's on iOS 7. For some reason certain applications open up on a small screen. I provided a picture of how it looks. It's like the picture itself takes about an inch of the screen leaving the rest of the area black. I've deleted and redownloaded these applications and it's still doing this. Does anyone know how to fix it?

You got to change the resolution of the display. Go to the settings then display settings and then change them. Cheers!