Choosing a TV – how are OLED and QLED different?

The choice of TV is no longer limited by the screen size and the presence of a built-in digital receiver. Modern TVs are measured by matrix types, hertz and resolution. Untrained buyers get lost in complex terms and fall for the marketing gimmicks of manufacturers. For example, OLED and QLED technologies are confused. But we know how such matrices differ and we will talk about it in our material.

Historical reference
The first “flat” TVs were LCD panels with backlighting on gas discharge lamps. Such light sources are still used in some organizations and enterprises. They look like Jedi lightsabers from Star Wars – they glow beautifully and crackle dryly as they work. Well-read people call these lamps fluorescent, and everyone else – just “energy-saving”.

Lamps of a similar type were used to illuminate the pixels in LCDs . They are called CCFL – Cold Cathode Fluorescent Lamp. Cold – because they need very little time to warm up and reach performance. The technology of matrix illumination with the help of such lamps has existed for a long time. They were later replaced by LED backlighting.
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An LED (light-emitting diode) is a semiconductor that emits light when an electric current passes through it. For the first time the diode “lit up” in the 60s of the last century. Since then, the technology has been refined and polished many times over. Now, diode light sources are used almost everywhere, from indoor lighting to screens of mobile phones and televisions.

LED backlighting works even more economically than its CCFL ancestors, and also produces a clean and believable “white”. In this case, the diodes heat up weakly and take up little space. High quality characteristics with small dimensions allowed engineers to create new technologies and methods of image transmission. For example, the market is actively filled with TVs with fashionable OLED, QLED and miniLED matrices .

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OLED (organic light-emitting diode) is an organic light-emitting diode. This is almost the same as a regular LED, but with a caveat. Due to its structural features, a classic LED cannot yet be so small to fit into a TV pixel. OLED works differently, so you can create it on a microscopic scale and even replace a pixel with it.

Therefore, in an OLED matrix, each pixel is a separate LED made of carbon material, which emits light when energized and does not need additional illumination. Pixels of any color and any brightness can exist side by side without interference, since they have their own light source, isolated from the rest. For this reason, OLEDs do not suffer from light leakage on dark screens.
This is a quick explanation of how OLED is different. If we consider all possible options for the execution of such matrices and reveal in detail how it works, then we will have to write a separate material – for example, like this article .

QLED (quantum dot light-emitting diode) is not just some kind of LED, but a whole set of technologies. And in general, QLED is more about the technology of shaping color and light on a matrix.

Regular pixels are microscopic liquid crystal flasks. When exposed to electricity, the crystals rotate and transmit backlight radiation. The light transmitted through the pixels of the matrix hits the filter, which cuts off some of the waves and forms the desired color. For example, to display red, the matrix must open only those pixels that “look” at the red filter. And so for all shades of the RGB range.