That means the screen needs to be replaced. If the system is under warranty, contact Dell for a warranty replacement of the display panel (they'll want the images you've captured). If the system is out of warranty, one source of Dell OEM parts: [URL]  
Hi, Without any physical damage, i see some lines in my screen which goes on and off and sometimes it gives a fuzzy looks to my screen. Tried all options available in Dell support site and  non worked. Noticed a thing on the display adapter driver -Intel(R) Iris(R) Xe Graphics. I have updated it to latest version as advised by Support assistant. When I run test via Support assistant only this Video Card test getting cancelled and not able [IMAGE][IMAGE] to see the result of this driver Intel(R) Iris(R) Xe Graphics.
Inspiron 7306 2 in 1 fuzzy screen/ flickers