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Local Dimming, i.e. the blanking zone on the TV. What is it and what does it mean?

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In traditional TVs LCD the backlight works like a regular flashlight – it shines equally bright everywhere. As a result, dark scenes are never truly dark and bright elements lose their clarity. Local dimming changes this situation, introducing a completely new image quality. This is a technology that has revolutionized the way we watch movies and series in recent years.

How does it work?

Local dimming intelligently controls the screen backlight. Instead of one light source for the entire matrix, manufacturers divide it into independent zones. Each of them can be darkened or brightened individually. This is why manufacturers boast about the number of these zones. The more such “reflectors”, the greater the precision of the image.

Two types of backlight

There are two main solutions on the market. The first is this Edge LED, i.e. edge lighting. The diodes here are placed on the edges of the screen. This solution is cheaper to produce and allows for a slim design of the TV, but it has its limitations. The second is Direct LED – here the diodes are located directly behind the screen. This is a more expensive solution, but gives better results.

Lights and shadows

Local dimming can really change the image. Black elements become deeper, brighter and more “juicy”. This is especially visible in films and games with HDR, where contrast plays the main role.

However, technology has its whims. Sometimes a glow appears around bright objects on a dark background, the so-called halo effect. This is especially visible in the subtitles. It also happens that bright areas spread out – this is the so-called blooming. In more expensive models with more zones, these problems are less troublesome.

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Mini LED and Local dimming

One of newer ones technology in TVs, i.e. Mini LED, strongly focuses on a large number of backlight zones. Instead of several dozen or several hundred zones, we have thousands of them, thanks to which the image becomes more precise. Mini LED is closer in quality to OLEDs, while providing stronger brightness.

If you often watch movies in a darkened room or play games with dynamic graphics, you will appreciate the advantages of advanced zone dimming. If you mainly watch TV in a bright room, the difference may be less noticeable.



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