That brings us to QLED TV, which is another marketing term. All QLED TVs are also LCD TVs, but they use quantum dots to produce colors.
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. The quantum-dot film is sandwiched between the other layers of the LCD panel, replacing the color filter in front of the LED backlight.
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 system renders very accurate colors, even at higher brightness levels where colors can start to look a bit washed out.
There are two newer enhancements to LCD technology that you should also know about. One is a feature called local dimming, which divides a TV’s LED backlights into zones that can be dimmed or illuminated separately. This can help improve contrast and black levels.
It works best with TVs that have full-array backlights, meaning that there are LEDs across the entire back of the set. In contrast, most LCD TVs on the market are edge-lit sets, with LED backlights along the edges of the display. These sets may still use local dimming, but it tends to be less effective and sometimes results in an effect called blooming, where you see halos of light around bright images shown against dark backgrounds.
