3/20/2023 0 Comments Dot by dot mean tv![]() For instance, it is woefully short on intensity in the red wavelengths, so red would appear dimmer than green and blue after filtering, thus impacting every other color the TV tries to make. If you fed it into a prism (remember those from science class?) it wouldn’t produce a rainbow of light equally bright in every shade. But this quasi-white light falls short of the ideal. ![]() The “white” LEDs in your TV are actually blue LEDs coated with a yellow phosphor, which produces a “sort of” white light. The funny thing about LED lights is that they don’t glow white naturally. In a way, quantum dots do something similar by helping the LED backlights in LCD televisions be more conducive to creating accurate colors. Light bulb makers have worked hard to change the “temperature” of these lights using various methods to make them feel warmer and more natural to our eyes, and today they’re easier to live with. Colors look off, and the light itself seems cold and sterile. As anyone who made the transition from incandescent light bulbs to compact fluorescent or LED lights knows, things in your home don’t look the same after you make the switch. Today’s TVs use LEDs to provide the “white” backlight, but here’s the problem with this setup: LEDs suck at producing white light. What you see on the other end is a picture. By mixing the amount of light coming from different subpixels, the TV is able to create many different colors in various shades and hues. If all three subpixels are open, the red, green and blue combine to appear white. When white light from the LEDs passes through a pixel with its red and green subpixels totally shut and the blue subpixel totally open, it appears blue to your eye. Each pixel has its own red, green and blue subpixels – those pinpricks of light - which can wink open and closed with liquid crystals, almost like shutters. Your basic LCD TV has three major parts: a white backlight that generates the light you see, color filters that will divide that light into pinpricks of red, green and blue light, and a liquid-crystal module that works like a grid of tiny windows (pixels) to blend those colors into an image. That means we’ll need to explain how basic LCD displays work before we go any further, so treat this as a refresher if you already know. More specifically, quantum dots work by fixing a glaring problem inherent to LED-backlit LCD TVs. Quantum dots are just a new component in an LCD screen. Quantum dots, or in scientific parlance, nanocrystal semiconductors, don’t amount to a new display type or resolution. With that in mind, here’s an explainer of how quantum dots work in televisions as it might be told by your junior high science teacher (because believe us, the college-level explainer will put you to sleep). Cram a bunch of them on a sheet of film, shine light on that film, and the film glows! Doesn’t sound all that magical, does it? Of course, it isn’t really as simple as that, and as complicated as the science behind quantum dots may be, how they work to make LCD TVs look better really is fascinating stuff. Simply put, quantum dots are tiny particles that glow when you shine light on them. ![]() Whichever pseudonym you hear used to refer to them, at the end of the day, what quantum dots really mean to you is: better color. Not to worry, that’s what we’re here for. Although we’re glad to be spared another acronym, the term “quantum dot” not only fails to explain what the tech does, but the subject matter is pretty heady stuff, too. Turns out, that point is now, and the term - which will be the buzzword de rigeur in 2015 - is quantum dots. But TV tech being the ever-evolving juggernaut that it is, we were bound to have to embrace new terminology at some point. Image credit: PlasmaChem PlasmaChemLED, LCD, OLED, 4K, UHD … the last thing the TV industry needs right now is another techno-acronym. Vials containing quantum dots: fluorescent nanoparticles of semiconducting material. ![]()
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