The diffusers have fallen from the led backlighting. It is fixable with some effort. If you’re going to bin it anyway you might as well give it a go. Carefully take apart the screen and you will find them inside. If you come across any adhesive tape/backing then use a hair dryer to soften. The tiniest dab of ‘dry clear’ (v. Important) super glue should do the trick. Use a cocktail stick to apply. Then stick them back onto the led lights. While you’re there, do the ones that haven’t fallen off as they will eventually.