Yo,
Is it in warranty? If it is, take it straight to kobo service center. If not, you can always try to open it, and try reconnecting the screen to the board(saved me once). If the screen remains the same, then you can polish your fixing skills by ordering a replacement screen like in the above opinions(If you are going with this, be careful with the adhesive, dont remove inner layer, one that sticks to screen or it will start showing water on your screen box and touch won't work[personal experience]) or you can always give up on it and buy a new one. Gl with w/e you choose.
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