Screen problem

Few days ago suddenly I noticed that there was a black line on my screen (from top to bottom).After some time I noticed that everything on my screen is blinking(or shaking) and then after some time screen went black.But I can turn on my mobile,I can recive a call by guessing where is call recive button ,msg r coming(as I can hear msg tone).but screen is blank.no mi logo or cm boot animation.twrp screen is also blank.I can also wipe data from twrp by guessing the button. What I have to do?

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