Originally Posted by cmoses
Can you explain when you would want to use Clear Action/BFI?
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Mainly video games. Though sports can benefit.
Essentially, Clear Action/BFI eliminates a specific type of motion blur. So everything in motion will look sharper, more defined. It gets rid of persistence blur/eye tracking motion blur.
So say you're playing a game like Sonic the Hedgehog, and he's zipping past enemies, trees, etc. With CA/BFI, those enemies and trees will look almost as defined as if they weren't moving at all.
BFI can and does actually make a world of difference compared to just brute forcing higher fps. For instance, an object moving along at 120fps without bfi, will not look sharper than than it moving at 60fps with bfi enabled. The 120fps object will have more frames, obviously, but the quality of each frame will be less detailed than the 60fps object that has CA/bfi enabled.
Unlike motion interpolation, it doesn't add a gross amount of input lag.
If you look at the rtings review and go down to the black frame insertion section, you can see that the logo is highly defined compared to the logo in the response time section. Both these logos were taken as they were in motion.
Mind you, there's more types of blur than just persistence blur. Movies and other general non-gaming media tends to have motion blur already embedded in the source, so that kind of blur can't be eliminated (things like camera blur). But in video games where motion blur may be turned off, or there is only a small amount, you gain a huge benefit. You're effectively getting rid of the worst kind of blur, but not display response time ghosting, sources (like games with motion blur turned on) or files (intended or otherwise, like slow shutter speed camera blur).
Also it's considerably more effective than even an OLED's instant reponse time (since again, response Time ghosting is not as obvious as persistence blur). Response time being fast is one thing, but it's still restricted to the same general persistence as lcds, so you still get a blurry moving image. Though nowadays OLED also tend to have modes that reduce persistence blur, though it's a little different than an LCDs BFI, and not quite as effective.
LCD BFI is not perfect, as it introduces screen flicker which may be bothersome. But I found that once you let your eyes adjust to it, you stop noticing it as much/or it just stops bothering. As someone who grew up with CRTs and plasmas that flickered at 60hz, this doesn't bother me in the least.
In short, I find it incredibly beneficial for video games first and foremost. I don't really use it outside of that. There's tech for gaming monitors that are essentially the same thing but do it at higher fps (like Nvidia ULMB).