Local dimming, in this case, becomes a bit looser of a term. Yes, the TV can still dim areas of the screen, but those areas are much larger than they are with full array, as you can see in the image above.
Worst-case, the "local dimming" could be nearly invisible, or dim huge swaths of the screen at a time, neither offering any benefit. In some cases, it could result in a worse picture. Best-case, there's a noticeable improvement in the picture quality, though not as much as there would be with full array. Depending where the LEDs are along all four sides of the screen, just the right and left, just the top and bottom, or just the bottom or the top , edge-lit local dimming can have widely different performance.
For the full story on all the different methods, plus illustrations of what each can look like in practice, check out LED LCD backlights explained. One last trick isn't really "local" dimming as much as it's just "dimming," or maybe "global dimming. As in, the entire backlight functions as one single light. It's common on these models, for example, that when given a full black image like the fade-out at the end of a movie, but before the credits start the LEDs will shut off completely, making the TV seem like it has a really good black level.
This is fake, of course. If anything should appear, the LEDs kick back on, and the black level jumps up, revealing the TV's true and far more muted contrast ratio. There are some tiny energy-saving benefits to turning off the LEDs, but visually this is can be distracting. Another variation of this theme senses the average brightness of the scene and, during darker scenes, ratchets down the whole backlight.
Local dimming on the Vizio P Series Quantum X greatly improves the contrast from to , but on a few TVs, like the Vizio M7 Series Quantum , the contrast decreases from to However, there could be a trade-off with some TVs that improve the contrast as they may also crush highlights too much, and this is why we have this test in the contrast ratio box and not local dimming. Read more about contrast ratio.
LCD panels are backlit by LED lights, so they rely on a backlight behind the panel to make the picture visible, and the LCD layer can't prevent all light from escaping out of the screen.
This means that even in a black scene, the backlight is still on, and some light escapes, causing blacks to appear gray. In an attempt to mask this shortcoming, some LED TVs employ local dimming to target dark portions of the screen and dim the backlight in those areas.
The intended result is that dark portions become darker, but everything else is left as bright as it should be, increasing the contrast between dark and light objects. OLEDs use self-emitting pixels and don't have a backlight, and because of this, they don't have local dimming features. Dark areas are completely off, leaving bright areas to stand out without any blooming. Some TVs offer different local dimming settings. Low settings will usually dim the backlight less, but then the local dimming will also be less effective at improving the contrast.
Higher settings will dim more, but may also make blooming, or other related issues, more visible. Local dimming preferences are subjective, so if you have multiple options, try out the different settings and choose the one you like best.
Apart from that, there's no way to get better results from local dimming. If this is a feature that matters to you, be sure to get a TV that scores highly in this test.
However, there may be some issues with local dimming on some TVs as it could cause blooming around bright objects or for entire zones to light up when there's a small object. Overall, most local dimming features on modern TV do an effective job at improving the picture quality in dark scenes, and only some lower-end models will have glaring problems. Get insider access.
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Please enable JavaScript to ensure you get the most out of the LG site, products, and services. This is in stark contrast to edge-lit LEDs, which feature bulbs around the edges of the screen. Because the backlighting bulbs are embedded behind the screen, full-array LEDs are capable of producing clearer, higher-quality images than their edge-lit counterparts.
Both edge-lit and full-array LEDs can produce high-quality images, but the latter type of LEDs typically come out on top. Full-array LEDs typically have more bulbs than edge-lit array.
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