HD Learning: Local Dimming, and what is it?

November 5, 2010 by  

Here’s some knowledge regarding HDTV and local dimming. What is it really and how does it benefit HDTV performance? Here you go, a condensed lesson courtesy of Engadget HD:

One thing that makes covering LCD TVs so interesting is that the technology is always advancing and one innovation that might be the biggest in LCDs yet, is local dimming. But you’re probably wondering, what is it exactly? Well in non-edgelit LED LCDs TV, there’s an array of LED lights behind the liquid crystal pixels, and local dimming is when sections of the LED array are turned off or dimmed to help produce the deep blacks — like Kuro deep. But while this tech can produce very deep blacks and fantastic contrast, there’s a catch, it also create an artifact referred to as a halo around bright objects. Of course we don’t exactly watch movies with flash lights or star fields every night, and dark scenes that expose the artifact caused by local dimming (we have to point out that cameras can sometimes make it more drastic than it appears in reality). So while we wouldn’t buy an LCD without local dimming, there’s still a lot to look forward to in the next generation when the dimming is sure to become more local, and thus the artifact will be minimized.

Don’t say you never learn anything here on our friendly blog, we always aim to increase the knowledge of HDTV at home and abroad.


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