Will iPhone 4 keep recording video if it automatically goes off?

I want to use my iPhone 4 as a dash camera. My question is, do I need to set it so that the backlight doesn't come on, that is, so that it doesn't turn off automatically?
In other words, will my phone keep recording video if it turns off automatically?

If you're using it to record something the phone won't automatically go to sleep. It only puts its self to sleep if you aren't doing anything on it.

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