QD-OLED vs. QLED vs. OLED, what's the difference?


Samsung's QD-OLED TV launched at CES 2022 attracted everyone's attention, but you may not know exactly what it is and what the difference is between QD-OLED and QLED and OLED. This article will help you figure it out.

I will talk about the LCD and OLED in order, and then about the QLED screen launched by Samsung, as well as the latest QD-OLED screen.



LCD is the "Liquid Crystal Display", its screen light principle, is to put a piece of the light-emitting module (called the backlight layer ) and then put a layer of color film (you can imagine like cellophane), which is the color people see. The color film itself is not light, to rely on the backlight layer to do. Popular LCD panels on the market, most of the LED (Light Emitting Diode, Light Emitting Diode) this light-emitting material as the backlight layer material, so many people will think that the LED screen = LCD screen, strictly speaking, the LED screen is only one of the LCD screen.


Because it does not emit light on its own, LCD panels are prone to color bias problems. For example, to present black, the white backlight layer of the light on the black film, naturally will not produce a pure black color, but will be grayer (people who have an old TV at home must understand). In addition, LCD panels are more likely to reflect, light leakage, viewing angle is also relatively small.

LCD panels have so many shortcomings, how come there are still so many products? Because during this transition period, its rivals - OLED, there are still some obvious shortcomings that can not be solved, plus LCD is the old technology, the product is always much cheaper, so it is still very active.

OLED's full name is Organic Light-Emitting Diode, the screen made by it can be said to be the favorite of the major TV manufacturers, the reason lies in its characteristics: as long as there is electricity, OLED will light itself. This means that the light emitted by the red, blue and green OLEDs is in the most original color into people's eyes, which will minimize the problem of color bias.

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Although the price of OLED screens has been reduced a lot, there are still some problems. For example, because they are composed of organic molecules, they will have a relatively short life span, and OLED screens only have a life span of about 10 years. Besides, because the various colors of OLED life are not the same (blue OLED life is the shortest), the blue color fades after the decline, so the screen display produces an uneven color.



QLED's full name is "Quantum Dot Light-Emitting Diodes", a technology that uses "Quantum Dot", which are invisible to the naked eye, that is, nanocrystals to emit light. Quantum dot is very powerful, it can light itself like OLED, but also can use the backlight method to light. But quantum dot self-lighting technology is not yet mature (and very expensive), therefore, the QLED TV on the market, in fact, is still using the backlight way to build from.

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Compared to OLED screen, it has some advantages: the screen is brighter, cheaper, less screen aging problem; but likewise, the view angle is smaller, black is not black and other problems still exist.



QD-OLED is a hybrid screen that combines both backlight and self-luminous technologies, plus the quantum dot technology that Samsung is proud of. It uses OLED for blue light, so it is self-illuminating, while red and green light is illuminated through the aid of quantum dots, allowing the blue OLED to shine as a backlight with delicate hues.

Because in fact only blue OLED in the light, so do not worry about the various problems arising from the different life of each color, it will be more beautiful than the traditional LCD screen, the production cost is also cheaper than all self-emitting OLED screens.