![]() So QLED TVs, like LED TVs, are also LCD TVs, albeit fancier ones. Because the size of the crystals can be controlled precisely, the system renders very accurate colors, even at higher brightness levels where colors can start to look a bit washed out. When these tiny crystals are hit with the blue light from the backlight, they glow, emitting very saturated primary colors, based on the size and composition of the quantum dot material. The quantum-dot film is sandwiched between the other layers of the LCD panel, replacing the color filter in front of the LED backlight. QLED TVs, from companies including Hisense, LG, Samsung, and TCL, use a blue LED light source, plus a film embedded with tiny quantum dots, or nanocrystals. All QLED TVs are also LCD TVs, but they use quantum dots to produce colors. That-yes, finally-brings us to QLED TV, which is another marketing term. ![]() At Consumer Reports, we sometimes refer to LCD/LED TVs to help consumers who have heard both terms. ![]() Nowadays, any LCD TV you buy is going to rely on LEDs. There were advantages to the technology, but LED sets were really just regular LCD TVs with a different type of backlight. Initially, LED backlights cost more, so some companies seized the opportunity to market the sets to consumers as a new, better type of TV. The phrase surfaced nearly a decade ago when companies switched from using fluorescent (CCFL) lamps to LEDs (light-emitting diodes) in LCD TV backlights, mainly because LEDs could get brighter and last longer than fluorescent lamps. The term LED TV is a marketing construct. Some light always escapes, though, which is why black tones on many LCD sets can look grayish rather than truly black. (See the illustration below.) The backlight is always on, and the liquid crystals act like shutters, opening to allow light in for brighter parts of a scene and closing to block light in dark areas. Unlike OLED TVs, where each pixel gives off its own light, LCD TVs require a backlight, which shines through a color filter to produce colors. Here’s how an LCD (liquid crystal display) TV works. These days, all LCD sets are built that way. You’ll see lots of references to LED TVs, but these are just LCD TVs that use LEDs in their backlights. Don’t let marketers confuse you: There are only two basic types of TVs-LCDs and OLEDs.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |