Yes the LCD is definitely damaged. If you are careful and use plenty of heat, no need to but a digitizer, you can reuse the original, but you'll be messing with applying adhesive and spend a lot of time cleaning all your fingerprints off of the underside glass of the digitizer. To save yourself time and energy, get a new digitizer with IC chip. You will be glad you did when your finished. Reusing the glass is fine, it will require a lot more prep time (A LOT) to make it look like new.