If your laptop's LCD is broken you can't fix it, you need spare parts. If you're not handy with getting a separate screen and installing it yourself, I suggest you go to the nearest repair shop and get it replaced.
It depends on your screen size and where you go. You can try calling Acer's support over the phone, give them your exact model and ask about pricing. Also, your laptop should come with a 3 year warranty, so maybe you'll be covered.