There are a few basic DIY hacks to remove an unsightly scratch from your LCD monitor or TV. These hacks may seem like they would never work, but dozens of wikiHow readers have reported they worked miracles. That said, others have not been so lucky.
Steps：
Vaseline Method
1.Clean the surface of the screen.
2.Take some Vaseline and fill the scratch with it.
3.Gently wipe off the excess Vaseline, being careful not to press too deeply so as to leave some inside the scratch.
4.Voila. Hypothetically, this works because the optical density more closely matches the LCD face than air. However, it can make the scratch more noticeable.
Pencil Eraser Method
1.Find a pencil with a clean, soft eraser. It must have no pencil graphite on it as you won’t want to smudge that on your monitor.
2.Lightly rub the eraser over the scratch or nick on the screen.
3.Keep rubbing until the scratch completely disappears [1].
Scratch Repair Kit
1.Type this into a search engine: +LCD +Scratch +Repair
2.The plus sign makes the search results include those words.
3.Maybe Scratch Pro will work for you.
4.Either way, test any repair ideas on something unimportant (if possible).
Warnings
Users have reported mixed results with these methods. Be cautious. Read the discussion page of this article to read how this has worked for other people.
Things you need
A clean, soft pencil eraser OR Vaseline.
Source from wikiHow