Why does my iphone turn dark when i tilt it?

When i turn my iphone horozontaly on the music app it turns it all dark i can't see anything when i turn it back the screen comes back up i'm currently on ios 7.4

You have auto Brightness on, try going into your setting then go to your Wallpaper and Brightness. Under Brightness there should be a tab that say auto brightness, turn that off and you wouldn't have any problems. Also you could turn up your brightness, only if you want to.

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