How to recover photos from my broken iPhone 4 using my Mac?

My iPhone screen is completely black and won't turn on. Whenever i attempt to sync it to iTunes i can't manually unlock the phone. Which is what i need to do to recover my photos. Any suggestions?

Unfortunately no in its current state. BUT, I'd take it to a shop like Dr. Phonez. The screen would be like $80 to fix. They do free diagnostics too if you want to test your luck.