how to solve watermark issue

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2018-05-02 14:21

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the impression of last opened screen remains for about 15-20 minutes as watermark in the screen after closing that. it happens when i use a static page like browsing or watching YouTube for more than 5 minutes....then when I close these tasks(browser or YouTube) the impression of the work remains on the screen and can be easily seen if one use dark colored wallpaper. how to fix this?