![]() Additionally, plasma TVs had to use glass on their front panel, which caused intense glare if you had any lamps or windows around the TV. LED TVs get significantly brighter, so they can fight glare from light sources easier. LED TVs are a clear winner here, and it's one of the reasons why they surpassed plasmas in terms of popularity. Learn more about contrast ratio Brightness and reflection handling For reference, plasma TVs had a max contrast of about 4,000:1, according to, but some recent LED TVs can reach a contrast of over 20,000:1 with local dimming enabled, like the Samsung QN90A QLED. Still, you won't get a perfect black level, but most modern LED TVs produce such deep blacks that even in a dark environment it looks like perfect black levels. VA panels produce a better contrast than IPS, and high-end TVs also have local dimming features that turn off certain zones of the LED backlights. There are two main types of LCD panels in TVs: Vertical Alignment (VA) and In-Plane Switching (IPS). ![]() However, technology has evolved to greatly improved the contrast of LED TVs, even to the point where it's also as good as what plasma once was. On the other hand, LED TVs can't achieve a perfect black level because the backlight is always on. This allowed the TV to display very deep blacks, but because there was always a bit of charge left in the plasma, it still wasn't a perfect black level. Since each pixel emitted its own light, it simply turned itself off when it wanted to display a black image. Learn about differences between full-array and edge-lit local dimmingĬontrast ratio was one of the main advantages and selling points of plasma TVs. They're still technically LCD TVs, but since calling them LED is so common now, we even label them as LED, and we'll continue to do so throughout this article. It's also important to note LED is simply a marketing term used by manufacturers to describe their backlight. You can see the differences between LCD and LED TVs below. The LEDs can be placed along the edges, which is called edge-lit LED, or all over the back panel, which is either called direct LED or full-array backlighting. It produces an image the same way as a regular LCD TV because it still uses an LCD panel, but it has more control over the backlighting. Light-Emitting Diode (LED) TVs are the same as traditional LCD TVs, but instead of using CCFL backlights, they use many smaller LED lights. When it wants to display black, the pixels are rotated to create an opaque screen so that light doesn't get through. This is what makes them different from plasma TVs because each pixel isn't self-emitting. When the light is turned on, it applies a voltage to the pixels, which makes them rotate a certain way to allow light through and produce an image. These are long tubes that are placed horizontally across the screen behind the LCD panel. Initially, LCD TVs used Cold-Cathode Fluorescent Lamp (CCFL) as their backlight. ![]() Unlike plasma TVs, LCD TVs use a backlight. Each pixel in the TV contains three phosphor cells: red, green, and blue, and these three colors combine to produce a color. Essentially, plasma TVs don't require a backlight, and each pixel is self-emissive as it produces its own light. Plasma TVs contain tiny pockets of gas, and when a voltage is applied to them, they turn into a plasma state. The voltage then strikes the mercury within the plasma to emit ultraviolet (UV) rays, which pass through phosphor cells to produce an image. Before explaining the differences between each technology, it's important to understand how each TV displays an image.
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