QLED vs LED is a TV battle that’s been ongoing for years and continues still, with sets of each type prevalent in electronics stores today. Indeed, examples of both feature in our best TV buying guide.
While these panel technologies may sound very similar, with LED standing for ‘Light Emitting Diode’ and QLED simply adding ‘Quantum-dot’ to the start of it, dig down into the details and you’ll realise that they’re pretty different in how they work and perform. And that’s where we come in.
In this QLED vs LED guide, we will discuss the two TV types and the differences between them to help you decide which – if either – is better for your needs and budget.
What is LED?
LED (Light Emitting Diode) is the panel technology from which QLED (Quantum-dot Light Emitting Diode) was developed. As such, it is generally speaking the more affordable and less advanced of the two panel technologies.
LED panels use an array of light-emitting diodes as the light source for an LCD (liquid-crystal display) panel, which essentially lets the light through to the screen. So yes, an LED TV is the same as an LCD TV, and some stores and manufacturers use the term interchangeably.
Initially, LEDs ran around the edges of the screen, but the technology developed so that an LED backlight could sit directly behind the LCD panel and shine light directly through it, creating a brighter and more evenly distributed contrast across the entire screen. Both methods still exist today and are called ‘edge-lit’ or ‘direct’ (or ‘full-array’), with the latter more commonplace today.
Over the years, the technology has developed further to improve contrast by increasing the number of ‘dimming zones’ and consequently leading to greater control over bright and dark areas of a screen.
LED TVs are generally more affordable than QLED (and indeed OLED) TVs, have the same long lifespan and are available in more sizes than any other screen technology.
How does QLED differ?
Current QLED (Quantum-dot Light Emitting Diode) TVs are very similar to what people generally refer to as LED TVs, but instead of the LED backlight passing light through an LCD layer, it does so through a layer of Quantum Dots.
Like an LCD layer, this Quantum Dot layer converts the backlight’s white light into coloured light, with the resulting colour being dependent on the size of the quantum dot itself – larger ones give off light at the red end of the spectrum, smaller ones at the blue end. These more effectively optimise each pixel’s light emission to deliver images on the screen that are brighter and more vibrant in hue.
In short modern QLED TVs are designed to produce richer colours than their LCD/LED counterparts, and they can often go brighter, too – though that also depends heavily on the quality of the backlight.
It is expected that one day, QLED TVs with self-emissive Quantum Dots will be available, with the idea being that these will combine the greater colour reproduction of Quantum Dots with the pixel-by-pixel contrast control associated with OLEDs (this is not what current QD-OLED TVs are, as they combine an actual OLED layer with a Quantum Dot layer), but these are still in the concept stage and it looks as though it will be many years before they become available to regular consumers.
QLED technology has predominantly been associated with Samsung, who outrightly favoured QLED over OLED technology (before it decided to, pretty recently, adopt that too), though other TV manufacturers such as Hisense, Vizio, TCL and Amazon also use it.
