(Image credit: Samsung)
SAMSUNG DISPLAY unveiled its first Quantum Dot (QD)-Organic Light Emitting Diode (OLED) display at CES in Las Vegas, USA, in January 2022.
According to industry sources, Samsung launched the project to make the quantum dot QD-OLED panel thinner. The goal is to reduce the number of glass substrates used in QD-LED panels from 2 to 1.
The QD-OLED, which Samsung Display has been in mass producing since the end of last year, requires 2 glass substrates: a glass substrate for thin-film transistors (TFTs) and a glass substrate for the QD color conversion layer.
The new project changes the QD color conversion layer process. In this project, Samsung will develop a technology that will print the QD color conversion layer on top of a blue OLED bag layer rather than a glass substrate as usual, and then proceed with the encapsulation process for the QD color conversion layer. A bag is a process that protects organic matter from moisture and oxygen. The encapsulation process for the blue OLED and QD color conversion layers is the same as before, but the difference is that the glass substrate for the QD color conversion layer is lost.
QD-OLED is a hybrid technology that takes the elements of OLED and combines them with quantum dots. Samsung has been working to develop this new technology to produce a display that maintains the benefits of OLED technology while removing one of its main drawbacks, namely the brightness and HDR performance.
Over the recent years, OLED TVs have gained popularity as the leading technology for picture quality by achieving perfect blacks and high contrast ratio along with wide viewing angles.
However, as compared with backlit LCD panels they have a lower brightness which limits their HDR performance which starts to show if you decide to place your TV in a sunny or well-lit room.
To solve this problem, Samsung decided to employ the QD technology, which it already uses in its QLED and Neo QLED televisions.
A layer of quantum dots in QLED TVs enhances their color accuracy and yields a wide color gamut and helps to increase brightness.
According to Samsung Display, a QD-OLED display has three main components: a TFT layer that includes an electronic circuit to pass current through the OLED material, a blue OLED layer, and a layer of quantum dots.
Passing the blue light from each pixel through the quantum dot layer creates green and red sub-pixels which, combined with the blue sub-pixel, make up the RGB color model.
In this model, red, blue, and green colors are added together to produce all the other colors on your TV.
By using quantum dots instead of a color filter for color transformation, virtually no light energy is lost. This results in a brighter display as compared to the traditional OLED TV displays.
Further, as the QD-OLED panels have self-emissive pixels, those individual pixels can be easily dimmed to get perfect black levels.
As a result of the deep blacks and high brightness, the QD-OLED panels can provide a far better HDR performance than traditional OLED displays.
Samsung says the QD-OLED displays can achieve a high contrast ratio of 1,000,000:1, offer wide color gamut, and have excellent viewing angles.