What's Good About Quantum Dot TV, OLED TV
- Jul 14, 2018 -

Quantum dots or liquid crystals


First of all, we must understand that OLED is the abbreviation of organic light emitting diodes. Generally we call OLED self luminous TV. And quantum dot television (usually called QLED TV), although only a single word but very different, the essence of the quantum dot TV is still liquid crystal, only the different backlight components.



Quantum dot TV says that the blue backlight illuminate different quantum dots. In the light of the filter film and the imaging and driving system, the quantum dots are inorganic materials. This material has the characteristics of high stability, long life and so on. Of course, the essence of this material is liquid crystal TV. Because the 2 product attributes are totally different, they can not be generalized, but they can be distinguished from the point of view of performance.


Color gamut


For example, from the point of view of the color gamut, the NTSC color gamut of ordinary LCD TV is only about 70% (display for sRGB, TV is NTSC), and some wide color domain TV can reach more than 80%. OLED TV can be up to 95% or more, so OLED in the color gamut is finished with ordinary LCD TV, and the other parameters are like the manufacturer's propaganda map of the lower figure.



The higher the color gamut, the stronger the color rendering ability of the screen, especially the need for higher color display range on TV. The higher the NTSC value, the wider the gamut. Now we know that OLED can reach 95%. What about quantum dots?



Quantum dot TV can easily achieve more than 110% gamut, and the new generation of QDs is even more frightening. But at the same time in the high color domain, the color accuracy will be deviant, so the color is rich or the color is accurate to see you choose, and the OLED TV is usually more accurate.


brightness


Often when we study OLED TV, we find that the brightness of the screen is not very high, even some only 200 nit, and quantum dot TV can do 4000 nit, of course, in the daily use and not so high brightness.


The most effective use of ultra high brightness is HDR, the local brightness of TV in the Dolby horizon and other HDR technologies can reach 1000 or 4000 nite, and the daily use is controlled at about 400 nite.



And the peak brightness of OLED TV is only 800 nit, which is why? It is the problem of life. The self luminescence characteristic of OLED determines that every pixel is shining, if the brightness is too high, and the quantum dot TV is essentially liquid crystal, so as long as the light is done much, basically want to make more light. How bright is it. The quantum dots are better for the HDR bright effect.


In addition, the old people on the mobile phone have said that the OLED screen saves electricity. In fact, OLED does not save electricity, especially when all the pixels are turned on, the power consumption is very large. There is also a truth in television, and quantum dots or ordinary televisions will not be much brighter if they are illuminating by backlight.


Light control


Cough, this topic first said quantum dot TV bar, whether quantum dots or ordinary liquid crystal, all need backlight irradiation to light, so the performance of the backlight system is very important. We all know that some of the ground scenes in the video are blackened, and some are brighter. The traditional side - in backlight TV, which comes from the side of the light source, realizes the light effect of the backlight through the light guide plate. The biggest advantage of this backlight mode is to simplify the backlight system, making the TV thinner and cheaper.



But the side - in backlight does not accurately control the brightness of the local area in the picture, so when there is a black big black big scene in the movie, the TV screen will be gray, because the TV is dark.



For example, the Las Vegas night view, the side - in backlight or the poor back - Performance TV will be dark when the image is displayed, because it is to keep the lower part of the image lighting.


The backlight of the straight down is that the TV backlight can be promoted from more than ten light sources to hundreds of luminous sources, and a small range of brightness control is realized through advanced chips and power technology, so that the quality of the picture is kept under the special picture, and this technology is generally called "local control". In theory, the more the better the local brightness control is, some Japanese and Korean brands can do hundreds of light control partitions, Hisense's new U9 series has done more than 1000 zoning this year. That's the question. How many partitions do OLED have??



The answer is very simple, how many pixels there are many partitions, 4K TV, then there are 8 million 290 thousand partitions. Because each pixel of OLED can be independently illuminate, OLED can kill any TV on the control of light. Take the night view of Las Vegas as an example, the sky of OLED is all black, which is a strong contrast with the lower part of the picture, which is the greatest advantage of OLED.


In addition to these 3 factors, OLED has inherent advantages such as response speed, contrast and visual angle. But if life OLED has to face the reality, after all, a OLED TV is not cheap, and the 55 inch 4K is the cheapest of nearly 10000 yuan, so the choice of high-end TV can be completely based on its own needs, and the high point of durable color gamut, the quantum dot is not run, the domestic TCL, Hisense, Korea SamSung and so on have quantum Turn on the TV. And OLED is mainly Korean LG, Japan SONY, domestic SKYWORTH, Konka and other enterprises, of course, the key is still depends on your purse thickness.