Lines on screen after replacing the screen

Hi there, I replaced the screen on my iPhone 4 (again) and i started it up and it was perfectly fine, so then I factory reset the phone, I finished setting it back up, after which when I got to the Home Screen, a bunch of lines started showing up on the screen, i then went to settings to see if I could fix it, and the lines went away, but as soon as I went back to the Home Screen the lines came back, it gets really bad in the camera and photos apps. All help would be appreciated!