Analyze the differences between QLED and OLED TVs
Want to buy a new TV? Then you are likely to come across these two terms: QLED and OLED. Although they have similar names, they are different technologies.
In short, QLED (Quantum Dot Light Emitting Diodes, quantum dot light-emitting diodes) is a trademark created by Samsung to describe its high-end quantum dot LED TV series. Some products from Hisense and TCL also use this technology. These products Use licensed through the QLED Alliance.
OLED (Organic Light-Emitting Diode, organic light-emitting diode) is similar to QLED from some aspects, because it is also based on an LED screen, but its internal composition is different. QLED TVs are illuminated by LED panels Quantum dots, while OLED TVs are made up of millions of individual organic light-emitting diodes.
Here's more information about QLED and OLED:
What is QLED?
Simply put, QLED TVs are a type of LED TV (not to be confused with OLED TVs) that use quantum dot technology to improve the display quality of key images. Can provide better brightness and wider color spectrum. This is because when applied to an LED backlight, these quantum dots act almost like filters, producing purer light than LEDs.
QLED is not a self-illuminating screen technology because the quantum dots don't directly emit the colors you see; they are spread over a membrane that acts as a color filter.
When the screen is on, the LED backlight shines on the diaphragm, refining the light to the ideal color temperature. However, because QLEDs are not emissive, the LED backlight that illuminates the screen is always on, which means they struggle to deliver the pure blacks of OLEDs.
What is OLED?
OLED stands for organic light-emitting diode. OLED TVs are made up of millions of OLEDs formed as individual pixels that each light up individually when powered, hence the name self-illuminating displays.
For this reason, when an individual OLED pixel is not powered, it is turned off and appears completely black, just like a television turned off, thus displaying a purer black. While QLED TVs can be made very thin, OLED TVs can be made even thinner. In addition, it is easier to make flexible OLED screens.
QLED VS． OLED
So which one is stronger or weaker between QLED and OLED? Let’s make a detailed comparison in terms of brightness, contrast, viewing angle, etc.
black display level
The ability of a monitor to display black can be said to be one of the important factors in achieving high-quality image quality. Purer black can result in higher contrast and richer colors. OLED is undisputed in displaying purer black.
If a pixel is not powered on an OLED TV, it will not produce any light and will therefore appear completely black.
QLED TVs, on the other hand, use LED backlighting behind a quantum dot filling layer to provide higher brightness and a wider color spectrum, using software to dim pixels that don't need to be turned on. This will trigger a problem called "light leakage", which means that light will overflow into the part that should appear black, which is distinguishable by the human eye and will affect the viewing experience to a certain extent.
Samsung is investing a lot of time and money into improving the ability of QLED TVs to display blacks, launching a new anti-reflective layer technology that is said to improve the problem, so expect this to close the gap between QLED and OLED in realistic blacks. For now, however, OLED still displays black.
As advertised by Samsung, QLED TVs have considerable advantages in terms of brightness. This isn't just down to software, it's mainly because quantum dots are able to reach brighter tones in the color spectrum without losing saturation, which is especially important in rooms with a lot of ambient light.
QLED TVs are also considered better suited for viewing HDR content because the spectral highlights in the image are brighter and more prominent, such as light reflected from a lake or car paint. However, there is some debate on this, with some arguing that the pure blacks OLED displays are better for HDR content.
OLED once defeated all competitors in this segment, but according to Samsung, the use of quantum dots in QLED TVs has improved color accuracy, color brightness and color capacity, and has better performance at extreme brightness levels. Wider, more saturated colors.
While there's no denying that QLED is capable of delivering an excellent color display, the better saturated colors at high brightness levels don't offer much of an advantage in normal viewing situations, so it's a tie in this round.
Response time and input latency
Response time is the time it takes for each diode to change from "on" to "off". The faster the response time, the less motion blur and the fewer artifacts. I'm sure you already know that OLED TVs contain millions of individual diodes, each of which switches independently.
In QLED TVs, the diodes are arranged in clusters and emit light, so individual diodes cannot be switched on and off, which results in an overall slowdown between the "on" and "off" states. In short, OLED currently has the fastest response time among all TV technologies, making it the clear winner in this regard and more suitable for playing games and watching sports events.
OLED is the winner again. The viewing angle of the QLED screen is in the middle, and the color, contrast and image quality will gradually decrease as the viewing angle becomes larger. Although the severity varies between different products, they can all be perceived by users.
The OLED screen can operate at a viewing angle of up to 84 degrees without any reduction in brightness. While some QLED TVs have improved viewing angles, OLED still has clear advantages. Therefore, if you have high requirements on viewing angles, OLED TV is more suitable for you.
OLED has come a long way in this regard, and when the technology was still in its infancy, OLED screens were 55 inches in size. Today, you can buy an 88-inch OLED TV.
But in terms of size, QLED displays have almost no size restrictions, and some QLED TVs can reach 100 inches or even higher.
When a static image is displayed on the screen for a long time, the image will leave an "afterimage" on the screen. The term "screen burn" is not accurate. It is actually just a degradation of the display effect. If you use a pixel for a long time, it will age and darken prematurely, creating a darker impression when compared with other pixels.
For most people, the impact of this issue is minor. If you have to decide the winner, then QLED is the winner and is less likely to age.
OLED panels are very thin and require no backlight. Therefore, OLED TVs tend to be lighter than QLED TVs, require less energy and are more efficient.
Once upon a time, QLED TVs could easily win this segment, but OLED TV prices have dropped, and since we're talking about high-end products here, comparable QLED TVs cost about the same as OLED TVs, so this segment is draw.
QLED has many advantages in brightness, size and service life. Additional technology has improved the black level and viewing angle. QLED TVs can provide better display effects in daylight and are more cost-effective.
However, in terms of picture quality, OLED is the winner. OLED TVs offer better viewing angles, purer blacks, and better contrast while being lighter, thinner, and using less energy. The display effect is better at night.
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