The idea works in theory but can lead to backlight leakage in between sections of the screen that are turned on and off, which can interfere with blur reduction.īacklight strobing, on the other hand, strobes the whole backlight on and off at once, matching it to the refresh rate of the screen. Instead, manufacturers developed techniques like backlight scanning and backlight strobing, which flicker the backlight on and off to create 'black' frames.īacklight scanning tries to emulate old CRT screens by refreshing the image and turning off sections of the backlight in sequence from top to bottom. This kind of BFI never really took off, though. The idea was to insert a black frame in between every frame in content that was displayed on an LCD screen, while the backlight remained lit. True Black Frame Insertion was first proposed by BenQ back in 2006 as a way to reduce blur on computer monitors. Backlight Scanning vs. Backlight Strobing Some people are much more sensitive than others. The amount of flicker that a person will find acceptable is subjective. You can see that the image with backlight flicker is noticeably darker due to the time that the backlight is off. The two photos above are from the same TV, the Sony X750H. See also our article on judder, which can appear when 24p movies are played on TVs with fast response times. Motion interpolation and BFI are both methods of motion blur reduction that use different means and produce slightly different results. Intentional blur, however, can be reduced through motion interpolation (also known as the 'Soap Opera Effect'), which increases the frame rate of content by interpolating extra frames to make motion look smoother. With movies and regular TVs, the low frame rate and the slow shutter speed of the camera during filming mean the video often includes significant amounts of blur intentionally, which can't be improved through flicker. This can be beneficial for sports and video games, because of the fast movement occurring in both. Those who aren't sensitive to flicker can use it to help improve the clarity of fast movement, as shown below. Most people shouldn't notice flicker caused by backlight strobing, but some people who are sensitive to flicker may experience discomfort and prefer a TV with a continuous light output. This can produce duplications following moving objects if the flicker frequency doesn't match the content frequency. Some TVs use flickering to decrease the brightness of images by rapidly turning the pixels or backlight on and off. If you want to see our test for monitors, check our Image Flicker of Monitors article. We currently only measure whether a TV has Black Frame Insertion (BFI) or not, and what frequencies it can flicker at, but not how effective its actual performance is. We photograph the appearance of blur on the TV with this strong flicker enabled and test whether it's possible to activate this feature with the ideal gaming settings. When evaluating the performance of image flicker, we measure the presence of backlight strobing under calibration settings and also other motion settings that enable a stronger flicker. A lack of image flicker can cause a trail to appear to follow moving objects, which can be an issue for sports or video games. Flickering the image displayed on a TV influences how clear a fast-moving object appears when tracked across the screen. Since OLEDs don't have a backlight and can turn individual pixels off completely, they can achieve the same effect with even more efficiency.Īlong with response time, one of the main causes of motion blur is how our eyes track moving objects. On LCDs, this is usually achieved by strobing the backlight on and off. Image flicker is when each frame is only displayed for a short time, with black frames, or periods of darkness, inserted between.
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