Horizontal lines about 1 inch black.. Sometimes It is colored

Hi.. My Ipad (1st Gen) has something on screen.. Horizontal lines about 1 inch.. Sometimes it's colored/black.. I'd just put it in my backpack and when I saw it there are lines on it I restarted it and It slowly get back to normal and It turned back again with the horizontal lines and permanently stayed like this past few days.. Please help me .. I dont know is there something broken inside