Screen is constantly flickering in purple/pink - what part is broken?

My galaxy tab 2 10.1 has a broken glass but has been working fine anyway. Now suddenly the screen is constantly flickering in purple and pink, the picture is at the same time jumping around, the lines making up the screen jumps at different directions, making it impossible to use. But the touchscreen responds, although I have to guess what I am touching when I can't see what's behind the flickering and jumping screen.

I wonder what part is broken, so I can try fixing it?