3M Privacy Filter, iPhone 4 3M Privacy Filter. Compatibility: iPhone 4 http://www.digitalversus.com/lcd-monitor/turning-glossies-matte-a781/3m-privacy-filter-ap569/test.html As you might have guessed from the title, the primary function of this filter is privacy. It was designed so that neighbours on, for example, a plane (see photo) can’t see over your shoulder and spy on your super confidential Excel files - as long as t... http://www.itreviews.com/3m-privacy-filter/ keep prying eyes away from your laptop screen and LCD monitor display: Ten years or so ago, when the contrast in monitor screens was not as good as it is today, there was a market for filters to stick on them and make the blacks blacker. Now 3M ... https://www.pocket-lint.com/laptops/reviews/69386-3m-privacy-filter-laptop-lcd Can this stop you sharing your company secrets? Easy to fit, works Will dim your display, company logo in the wrong place If you constantly find yourself working in public areas and worried about your secrets falling into the wrong hands this is a must have https://www.theregister.com/2006/05/26/review_3m_laptop_privacy_filter/ Mac owners peeved that Apple has only just introduced glossy notebook displays - products the rest of the laptop industry have long since adopted - have a saviour, of sorts, in the Post-it company 3M. So too do notebook users fed up of folk peering ove... 3M calls its filters Laptop Privacy products, and that's exactly what they provide. They'll certainly prevent casual glances at your screen exposing confidential information, though they don't cover vertical viewing angles. They're also pricey. That s...