Local dimming is a function of led TVs that make the background screen dim when displaying the picture to the user. This cause the black appear deeper and darker on those parts of the screen, which is a great benefit for the peoples who watch the pictures or the videos with darker scenes, like movies, and tv shows.
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Local dimming was been introduced to enhance or improve the contrast ratio in led and LCDs. As the LCD industry moved towards the lowest price, cheaper, thinner edge-lit methods, local dimming was adopted to work with these TVs too. To check the local dimming, we play a test video on the LCDs to see whether it’s working effectively. We then evaluate the TVs objectively on the basis of whether the function improves the performance of the picture quality.
When it matters:
local dimming is developed to enhance the contrast ratio by making the black color look more darker and deeper. The local dimming feature will then show the major differences when watching the videos in a darker room. Lights were on in the room would cause the tv to reflect that light, which means you won’t to be to know the feature or the advantages of the local dimming.
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How to get the best results:
Some TVs offer inbuild feature as local dimming setting. Low settings will usually dim the backlight less, but the downsides of local dimming (see the section above) also won’t manifest quite as badly. Higher settings dim more, but also more significant downsides.
Local options for dimming are different, so if you have various alternatives, attempt specific settings and choose the one you like best. Apart from that, there is no method to achieve better local dimming results. If this is a feature that matters to you, make sure you get a highly scoring TV in this test.
Types of local dimming:
There are 3 different types of local dimming – edge-lit, back-lit and full-array and you’ll need to consider which is right for you.
Edge-lit local dimming:
Most of the TVs with local dimming are edge-lit. As the title suggests, the LED lights stand around the corners of the display instead of behind it. They need smaller LEDs than designs that are back-lit or full-array – so they’re running thinner and more energy-efficient.
Back-lit local dimming:
Here the LED light is located back or behind the screen. it has also called “global dimming”. Found on lower priced TVs, the LEDs function as a separate light, making the whole picture darker with darker images and brighter parts.
Full-array local dimming:
The lights are sitting behind the display again, but they’re zoned this time. For the ultimate image quality, certain zones are dimmed and lightened as required. Full-array offers the finest out of 4 K HDR (full vibrant spectrum) televisions by providing even higher color contrast.
Why does local dimming exist
For up to 10 years, the contrast between LCD and LED TVs has been top-out at 5000:1, and blacks on LED TVs are at best very dark gray, even now. This is due to the fact that LCD and LED devices are backlit, implying that they rely on a light behind the panel to make the image clear, and the LCD layer can not block any light from leaking from the frame. This combination means black still gets illuminated a bit and so has a brightness. This reduces contrast.
Some LED TVs utilize local dimming in an attempt to mask this shortcoming to avoid dark parts of the panel and dim the backlight in those regions. The intended result is darkened parts, but everything else should stay as vivid as it should be, that the difference between dark and light. However, there is always a trade-off because the backlight is not precise enough. Even the best local dimming introduces issues to the picture, so some people will much prefer to leave local dimming off when it is available.
Local dimming can introduce minor problems on some TVs
- Light spreading into the darker room around bright objects.
- A trail of light following moving bright objects.
- A loss of detail in dark areas.
- Unintended parts of the dimmed display.
- A fluctuating brightness of the screen.
Contrast: This setting affects the color contrast of the TV panel, not the effectiveness of the quality of the local dimming.
Peak brightness: Some TVs also have a setting that makes the white highlights extra bright. It functions similar to that of local dimming but in reverse. This setting is very important for HDR media.
Micro dimming: A Samsung feature. Processes a video in order to copy the local dimming. It doesn’t dim the background color, but it changes the contrast ratio of the images. A video purist normally do not like it because it messes with the video setting on TV,
CE dimming: During darker scenes, it dims the lighting for the entire panel. Some people don’t like it, because sometimes, like during a movie’s finish titles, you can feel the entire display dimming at times. In ‘ Movie ‘ mode, it’s not as good, and the ‘ PC ‘ method comes completely disposed of it.
Frame dimming: Frame dimming is an equivalent to edge-lit local dimming, but with even smaller zones. Rather than altering the color for a particular display region, it is the lighting of the entire display area that influences the strength. You can see this as a very fundamental local dimming variant.
HDR: a TV with a good local dimming implementation will do well with HDR because it will be able to further brighten the highlights. Learn more about HDR.
Local dimming is a feature that dims the backlight color of TVs in order to enhance more darker of blacks. It is very beneficial for the people who like to watch the movies or the videos in the black background to look deeper and darker.