A brief comparison between QLED and QD-OLED display technology
Samsung has introduced various TV sets based on QLED as well as QD-OLED technology. It introduced various new TV sets at CES 2023. In this short piece, we will uncover the details of how the QLED and QD-OLED display technologies work.
What is QLED display technology?
When it comes to QLED and LCD TV, both are similar in their display works.
Among the various layers, QLED is based on an LED backlight, a color filter, and a LED backlight. One of the major differences between QLED and LCD is the QDEF. QDEF abbreviates for Quantum Dot Enhancement Film. QDEF is utilized in QLEDs in front of the Blue LED backlight.
The QDEF layer is capable of converting some of the blue light into pure white light. In this manner, it provides enhanced brightness as well as a wide color gamut for HDR. One of the competitive advantages that QLED holds over LED and Mini LED displays is that it presents less backlight bleed.
In short, QLED TV works in a similar manner as that an LCD. In a QLED TV, colors are generated via the color filters and a polarizer. Additionally, it also utilizes the quantum tech behind the LCD. The quantum tech helps with brightness and HDR performance
What is QD-OLED display technology?
Before diving deep into the discussion, let’s just clear one point over here. OLED TV panels and [AM]OLED panels used in smartphones are way different from one another. The OLED panels for smartphones are based on red, green, and blue self-emissive pixels. On the other hand, OLED TV panels are based on a color filter. These color filters are concerned with color conversions just like the LCDs. However, in comparison to OLED and QLED, QD-OLED TV panels utilize quantum dots. They do not rely on color filters for the conversion of colors on subpixels.
Quantum dots are actually tiny nanocrystals. These nanocrystals absorb photons and release new ones in different colors. The resultant color is different. Since it is dependent on the size of the quantum dot. Interestingly, blue light is emitted by the smallest quantum dots. On the other hand, the largest quantum dots emit red light. However, color variation exists between the two extremes [smallest and largest] of the dots.
When it comes to QLED TV panels, they use quantum dots to convert some of the blue light [emitted by the LEDs] into pure white light. Additionally, the QLED panels require a color filter as well as a polarizer. However, QD-OLED screens are quite different in this aspect.
QD-OLEDs directly convert the blue light from an OLED array to other colors. It doesn’t require an outdated color filter and a polarizer. Do note that the QD-OLED and AMOLED tech is different. However, it is quite close to the OLED or QLED TV displays.
In conclusion, it is clear that QD-OLED and QLED panels are different from one another. Although both rely on quantum dot technology. The manner of utilizing the quantum dot tech is distinct in both panels. Whereas QD-OLED panels depend more on quantum dots to create colors in contrast to QLEDs. The QD-OLED panels practice the quantum dot tech for color reproduction. While on the other hand, QLED uses it for white light and HDR.
QLED vs QD-OLED TV Displays: Pros and Cons
Although these techs are great. However, technology has its pros and cons.
QLED TV displays offer a wide color gamut. They are brighter than QD-OLED. On the other hand, QD-OLED displays offer better contrast and deep black levels just like the AMOLED screens of smartphones.
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