![]() However, the one major downside to OLEDs compared to LEDs is their risk of permanent burn-in. They also have wide viewing angles, sometimes even wider than some IPS panels, so OLEDs are a good choice for wide seating arrangements. This means that they also have perfect black uniformity as there's no blooming around bright objects like on some LED TVs. This allows the pixels to individually turn on and off, resulting in perfect blacks. Unlike LED TVs, OLEDs don't use a backlight and instead have self-emitting pixels. There are competing technologies, like OLED, which also present their own unique characteristics. ![]() TV manufacturers have come up with ways to improve LED TVs to increase picture quality. You may need to increase the text scaling to read it properly, but this issue isn't common with an RGB layout. You can learn more about it here. Some applications may expect an RGB layout, so if you have a BGR sub-pixel layout, text may not look clear. The sub-pixel layout doesn't directly affect picture quality unless you're using it as a PC monitor. Many IPS panels, like the ones on the Sony X800H or the LG SK9000, use RGB sub-pixel layouts, while many VA panels have a BGR layout, like on the Hisense H9G. The way the pixels are laid out can also affect text clarity. When you compare the pixels visually, IPS panels look like chevrons, VA looks like very straight rectangles, and PLS looks like round-edged capsules. This panel type was designed by Samsung and technically performs the same as an IPS panel. There's also another type of IPS panel, called Plane-to-Line Switching (PLS), which can be seen with the Sony X800H. Learn about black uniformity Technical Differences ![]() The Hisense's screen is much more uniform, and although you can see some backlight bleed along the edges, it disappears if you enable local dimming, as seen in this photo. The entire screen also looks blue due to the low contrast ratio. This doesn't mean that every VA panel TV has good uniformity, as this can change between units, and you can also improve uniformity using the local dimming feature.Īs you can see in the pictures above, the Sony has uniformity issues with backlight bleed and clouding throughout. However, most VA panels that we've tested have good black uniformity, while most IPS panels have sub-par black uniformity. No LED TV has perfect uniformity, and unlike viewing angles and contrast, the panel type doesn't completely determine its black uniformity. Ideally, you want to see a completely black screen with the center cross being the only part that's lit up, and this is important for people watching movies. Our black uniformity tests determine how well a TV displays a dark scene with a bright image in the center. Learn more about contrast ratio Black Uniformity In the photo above, the Hisense has a much better contrast ratio both photos are set at the same brightness, but the Hisense appears brighter because there's a bigger contrast between its deepest black and brightest white. On the other hand, IPS panels normally have low contrast, so blacks look closer to gray, but you may not notice the difference in contrast in bright environments. Most TVs use VA panels due to this main advantage, and high-end models may have a local dimming feature that further enhances black levels. VA panels are far superior to IPS panels when it comes to this, so if you tend to watch movies in the dark, you likely want to get a TV with a VA panel. However, if your TV has a low contrast ratio, you'll notice that blacks look gray when viewed in the dark. It determines how well a TV displays blacks, so one with a good contrast displays deep blacks when viewed in the dark. Contrast ratio is one of the most important factors when it comes to picture quality.
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