MacBook air early 2014 (11'') screen issue

Hi,

Could anybody please tell me what's wrong with my computer screen?

There are many of them, kind of smear/trace diagonal lines run at ~ 45 degree.

Is there any chance I can fix it myself by replace some cable buying somewhere on the internet without taking it to the store? I don't want to replace the screen, the price is so high even at independent repairer.

Thank you so much.