Hi , I am confused about something. My screen works fine but it is really cracked. The touch screen works and the display works as well, but there is this purple & green line down the middle of my screen. Half of screen turns white when I turn the phone on but when I turn the brightness all the way up, the white goes away and the screen works as it should. But every once in a while my brightness will go down and it will turn white again but I turn it back up and it works. Would I need an LCD screen or a Digitizer screen?