OLED vs QLED TV Technology | Pros & Cons | Which is better in 2021?

You must have come across the two terms, OLED and QLED, TVs, because there has always been a war between OLED vs QLED technologies as both the technologies are quite up to the mark and deliver a better experience for the customers.  

As the two terms sound similar, knowing what they mean is essential. Is it the Hen and the Chicken scenario, or is it entirely something else?


The LED and LCD have been around for a long time, so individuals often mistake OLED with the latest LED wave.

It was released for the good of the general public in the late 2000s. And since then, it has been ruling in the market. 

On the other side, the relation between QLED and LCD can be traced. It may be assumed that the QLED is an expansion of the LED. Although LCD has been around for quite some time, QLED technology has recently been introduced.

Quick Highlights of OLED vs QLED TV

BrightnessQLED produced unmatched brightnessUnable to produce this amount of light as QLED does
Response Time2 to 8 millisecondsOLED takes about 0.1 millisecond
ColourQLEDs produce better coloursNot as good as QLED
Viewing AngleAs the viewer moves from the centre, the colour quality and contrast fallsOLED screens offer extremely wide viewing angles
Life SpanHave a decent life span.Not more than 5 Years
SizeQLED comes in size of 100 inchesIt comes in size of 55 inches to 88 inches


Before going ahead with OLED Technology, let’s first understand how LED functions: 

What happens to the LED is that a “Junction Diode” is formed. Here, the current flow is in one direction. Two semiconductors are put together, one positively charged and one negatively charged.

The excess electrons in the positively charged semiconductor pass in the direction of the negatively charged semiconductor.

Excessive energy is released in this transition, and this lights up. If they are connected differently, you will find that the current does not move, and the light does not turn on.

How is OLED different from LED? 

OLED is the acronym of the Organic Light-Emitting Show. In this technology, two electrical conductors illuminate the backdrop, and in between, a carbon (organic) based thin layer is inserted. 

The next nearest layers are the negative and positive terminals; below the two terminals, there are two more layers, the emissive and conductive layers. 

QLED vs OLED Technology

But when is the light emitted in the whole process? 

As the voltage is coupled between the anode and the cathode, the flow of electricity begins.

The electrons move in the direction of the cathode to the anode. The electrons are now introduced to make the emissive layer negatively charged, while the conductive layer is positively charged, missing its original character. 

These positive charges are much more agile and thus travel around and encounter a whole. They both balance each other out, and this provides energy by the release of a photon that is the illuminating element.

This operation takes place uninterruptedly for the LED to shine continuously. 

In basic terms, the entire technical concept of LED/LED worked to get a fluorescent light sheet (CCFL) on the back that would emit light in the foreground to provide shades to the colors. 

But OLED technology is a complete 360-degree revolution since it does not use a reliable source for lighting purposes, but each pixel has its light emitters.

It allows users to manually monitor each pixel to achieve the exact hue, shade, definition, and higher contrast ratio.

OLED display

Types of OLED

OLED (Traditional)

The standard OLED comprises organic carbon sheets between two terminal sheets made of glass.

OLED (Polymer) 

Unlike Polymer OLED, the two-terminal sheets are composed of substantial plastic molecules that are cost-effective and make the structure more stable, making it bent. 

OLED (Passive Matrix) 

PMOLEDs have three segments: cathode strips, organic carbon layers, and anodyne strips. The anode strips are arranged so that the layers cross each other perpendicular to the other, creating small squares. The squares that have been shaped make up the pixels.

OLED (Active Matrix )

AMOLEDs have a standard OLED model of the cathode, anodyne and organic molecules. The distinction lies in the anode layer at the top of the thin film transistor array known as TFT.

OLED (Transparent )

Transparent OLEDs’ main advantage is that when the OLED is switched on, the light moves in both directions.

OLED (Top-emitting)

The layer is made of some malleable material that allows them longer life as it does not crack and gives way to foldable screens.

OLED (Foldable)

They emit crystal-clear and very vivid white light. The lamps in the background are fluorescent and, thus, energy-efficient.

White OLED 

These emit crisp and very bright white light. The background lights are fluorescent in color and hence energy efficient.

Advantages of OLED 

  • The OLED’s plastic or organic outer layers are sleek, compact, and lightweight than the LED or LCD’s glass layers.
  • Since OLEDs do not need glass as a carrier, it is brighter as glass absorbs more light. 
  • OLEDs do not require backlighting as they produce their illumination. 
  • OLEDs have a larger viewing range when they generate their own light; just under 170 degrees.
  • Even, LEDs and LCDs need support glass, and some light is absorbed by glass. OLEDs do not need any glass.

Disadvantages of OLED

  • The cost of production is high. 
  • Water or other forms of liquid can harm the device.


As mentioned above, QLED is an understandable and straightforward technology and is just an improvement in LEDs. It’s not a modern fund innovation at all—full form of QLED Quantum dot Light Emitting Diodes. 

Unlike its predecessors, it does not rely entirely on the output of white lights and a mixture of the same to create the final show.

QLEDs have a very different way of operating, but prima facie can sound the same as LED technology. That being said, QLED shares quite a bit of its ability to work with OLED. 

What makes QLED stand out from its rivals is that, in this technology, each pixel produces and emits its light and is independent of the other pixels.

Therefore, each pixel is a few nanometres in dimension. The color of each pixel depends on its size. Like, the larger pixels emit red light while the smaller ones emit blue light.


The theory of Quantum Dot technology was first coined in the 1990s. QDs can be of two types: 

Photo-Emissive: means electrons or positively charged ions derived from metals as energy is emitted in the form of light.

Electro-Emissive: this is an event that occurs where a material releases light as electrical energy travels through it.

There is a conventional LED panel, and a sheet of quantum dots is arranged in front of it. This layer of quantum dots is capable of generating its light. The pixel size ranges from 2 nanometres to 10 nanometres.

The structural composition and the size of the quantum dot mostly decide the energy level. The diameter of each pixel determines the rays’ wavelength, which gives effect to the light it emits. Controlling the pixel size will give rise to endless pixels.

The structure of components that are put within is improved in the latest QLED technology that has been used. The mainstay and the outer coating was made of metallic alloy. 

It is said to improve the color effects and preserve the colors even at high brightness levels when we always see the brightness slipping away.

Advantages of QLED:

  • Bright, vivid colors 
  • No pause and no burn-in 
  • Renders sharp colors even in intense daylight
  • Sizable

Read best QLED TVs in 2021 in India

Cons of QLED:

The problem is that the quantum dots on current QLED TVs do not emit their light. Instead, they get the backlight transmitted into them, much as an LCD layer does on non-QLED/LED backlight sets.

Highlights (QLED vs. OLED)

  • Brightness

From the functioning of how LED operates, we realize that it uses a backlight, and besides, quantum dots contribute to the brightness while not fading away colors. 

OLEDs cannot contain this amount of light, such as QLED does. If the TV is put in a comparatively dark environment, OLED can perform just as well, but QLED produces unmatched clarity with saturated colors in a well-lit space.

Read more about HD, Full HD, Ultra HD

  • Response Time

It checks how easily a pixel changes its output to the full display. The quicker it is, the slower it would be. 

On average, the reaction time of the QLED screen is 2 to 8 milliseconds, which is much too long compared to OLED, which takes only 0.1 milliseconds, rendering OLED the undisputed champion here.

  • Viewing angle

One of the main disadvantages of the QLED screens is that the brightness of the color and the contrasts keep dipping as the audience moves from the middle. 

On the other hand, OLED displays give huge viewing angles that go up to 84 degrees. 

While some of the QLED screens come with anti-glare coating, OLED wins this section.

  • Contrast

Dark blacks and light whites make up a distinction. The contrast can be accomplished by making very dark shades of black; besides, white naturally tends to appear lighter. It alone will offer a great deal of comparison.

QLED must purposely dim the light created in the background and block the residual light. It still makes space for vulnerabilities dubbed “light bleed,” a condition where the light attempted to be filtered somehow penetrates.

Electricity consumption 

As stated earlier, OLEDs are highly energy efficient. Even though QLED technology is new and is thus always considered more energy-efficient, OLED is a sure winner.

  • Life span

Based on how OLED technology works and the assertions made by LG (which manufactures OLED), the displays will lose just 50 percent of their brightness if they are used every day for at least 5 hours in 54 years! 

The QLED screens are checked and tested. They don’t last a lifetime, but they do have a good life span.

  • Colour

Theoretically, QLEDs create stronger colors and have a wider variety of colors to sell. But the efficiency has yet to be checked in real life.

  • Size

OLED has been on the market for quite some time and has come a long way from having a maximum height of 55 inches to 88 inches today. But the star here remains QLED with a vast 100 inches that may expand more.

  • Price

We can take into consideration the fact that both innovations make up a luxury portion of displays. The most economical screen that uses QLED is only a few numbers less than OLED. 

Difference Between OLED and QLED Technologies

QLED is short on the Quantum Dot Light emitting diode. Instead of the photoluminescent particles used in OLED, QLED particles are electroluminescent nanoparticles. 

This system supports the light to be transmitted straight to the monitor instead of being passed to the backlight of the LED and then to the display. This transfer of light from another medium distorts the purity of colors; the QLED technology keeps track of the same.


In the above articles, we have mentioned the OLED and QLED Technologies. How the two TVs are different from each other in every aspect. From the display screen size to the Price, OLED and QLED offer various features and technologies. 

Although the brawl between OLED vs. QLED is long-lasting, depending on the requirement and budget, people prefer QLED TV, as the screen size is more prominent and has a longer lifespan than the OLED TV.

With the screen size and longer lifespan, the colors of QLED are better than the latter. The colors are more blissful and attractive.

Though one of the cons of QLED is that it does not emit its light, instead it uses the backlight offered to it.

While on the other hand, OLED TVs are quite expensive, but OLEDs are highly energy-efficient than QLEDs. OLED has proven its value on the market by offering features such as large viewing angles, better contrasts, lower power consumption, and lighter weight.


Michael Benedict
Electronics Engineer by education, blogger by passion. I review gadgets kitchen & home appliances. I focus on the quality of information rather than serving quantity. There are many new ideas generated all over the world every day and I research and share some of them here. You can connect with me at https://www.instagram.com/michael_benedict89/

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