Don't be fooled by manufacturers to fake 4k big bottom 4 color 4k HDR these are ghosts

When the concept of 4k TV was just getting fired four years ago, 4k is still a technology that sounds a bit distant to ordinary consumers. 4k is still just a tag in the mall, and there is only one source that can only be found. Demonstration of several rare scenes. Four years later, unknowingly, the popularity of 4k TV has reached the level of knowing about the uncle who sells cigarettes under the floor. When ordinary consumers purchase new TVs, 4k TV has become a popular choice. In July 2016, the proportion of 4k ultra high-definition TVs in domestic TV sales was 48%, which means that each time 2 TVs were sold, among them, There is a 4k TV.
In order to highlight the differences and uniqueness of their products, 4K TV manufacturers are better able to cater to the needs of consumers and continue to push new concepts, new technologies, and new standards to the market. Some of these technical standards do represent better picture quality and higher performance, but there are also many technical standards that are actually intended to reduce costs. After all, prices are an important parameter that consumers are concerned about.
Different kinds of concepts, technologies, and standards are better than others. Manufacturers have manufacturers' opinions, sellers have sellers' opinions, and ordinary consumers are dazzled. Today, Xiao Bian will take you to those manufacturers who are touting the technical terms. , Let you really understand the 4k TV, the various manufacturers from the bottom of the blind.
The 4K standard first came from the DCI standard of the 2004 film industry. Later in 2012, the International Telecommunication Union (ITU) released the Ultra HDTV international standard. In this standard, 4k TV is defined as follows: horizontal resolution 3840, vertical resolution 2160, aspect ratio 16:9, total about 8.3 million pixels. Among them, the horizontal resolution and vertical resolution of the number of pixels are respectively 2 times before the 1080P (1920x1080) standard, the area is 4 times the HDTV standard is 1080P, which means that there are 4 times the number of pixels, the screen information is more abundant and delicate .
Which 4k and 3k 4k options?
As an ordinary consumer, you are not seeing 4 colors vs3 colors, I feel sure that it is 4 colors, so much the same. In actual fact, let the HD Fan give you a thorough look at the origin of the 3 color 4k and 4 color 4k, as well as the manufacturer's blind.
In the past, traditional LCD TV screens were composed of RGB (red, green, blue) primary colors to adjust the color and brightness display. Each pixel actually has 3 RGB sub-pixels. The 3 sub-pixels can control the brightness according to the signal of the signal source to modulate the color of one pixel. At 4k resolution (3840x2160), a picture has a total of 8.3M (M million units) pixels, each pixel has three sub-pixels, a total of 24.9M sub-pixels.
The 4 color 4k, mainly proposed by Korean manufacturers Samsung and LG, adds a W sub-pixel based on RGB, which is a white pixel, and controls the brightness independently, so that the brightness control capability of the liquid crystal panel is stronger and the light transmittance is higher. The detail and contrast performance will be better and more energy-efficient.
See here, do you think the 4 color 4k technology is awesome and ready to buy it? And slowly, in fact, manufacturers buried pit.
The trick is that the extra W sub-pixels are not extra gifts but occupy the original pixels. According to our ordinary people's understanding, 4 color 4k should be a picture with 3840x2160 pixels, each pixel has 4 sub-pixels, so that the hardware should be 30% more than the 3 color 4k pixels. However, under the eye-catching barriers of Korean manufacturers, this is just wishful thinking. In fact, what they call 4 color 4k, a pixel does not have 4 sub-pixels.
Under Samsung's definition, one pixel is not the four sub-pixels of RBGW, but one pixel has only two sub-pixels (RG pixels or BW pixels), which is equivalent to dividing the original pixel into two. Samsung's four-color 4k total total number of sub-pixels is 3840x2160x2 = 16.6M, which is 8.3M less than the 3 color 4k, which is less than 8.3 million sub-pixels, if the algorithm consists of RGBW4 sub-pixels to form a pixel Samsung's four-color 4k actual resolution is only 1920 × 2160 level, 4k standard resolution is 3840x2160, the horizontal direction is less than 1 times, see here, is not it feel a little pit it. Samsung wants to do this? Of course, it is to save money. This can bring about lower hardware costs. Whether it is the price war or the conversion to profits, it is all silver. As for the right to know about consumers, Samsung thinks you can't see it anyway. Samsung's approach is like buying egg filling cakes. The store said that it is an extra egg version sold to you. In fact, the use of materials has shrunk. It is simply too bad. How does the country not use Samsung's cheeks to study the body armor? .
LG, as a Korean manufacturer, is slightly more generous than Samsung. Its 4-color 4k definition means that five sub-pixels count as two pixels. Is it difficult to understand? Anyway, to convert to what we call the physical resolution, LG's 4 color 4k is 2880X2160, compared to 4k standard resolution 3840x2160, the horizontal direction is still a short cut, but the total number of sub-pixels is still 24.9M, and the traditional 3 The 4k is flat, at least compared with Samsung's. If we don't increase the amount of hardware, we haven't reduced it. We just changed the display mode. The actual result is just a matter of opinion. Still compared with egg filling cake, LG sells egg filling cake, known as adding egg version, its practical material is still the same as the original, and did not add anything, just changed the method only, although it also somewhat confused the meaning of the consumer Inside, but at least not as thick as Samsung.

Speaking of this, we all know how to choose 4k 4k and 3k 4k? All in all, the current 4 color 4k products cannot meet the requirements of 4k standard resolution of 3840x2160 in actual physical resolution. Xiaobian calls it pseudo 4k, even if they find a lot of authoritative departments to certify endorsements. Can not change its essence. Of course, because of the reduction in costs and gimmicks, and the blessings of big manufacturers, 4K 4K may not be too bad in the market, but remember, it's not true 4K.

What is YUV4:4:4?

A term that has recently been stir-fried is YUV 4:4:4. Does it mean that you can't read clouds in the cloud? Ah, 4K 4K is better understood. YUV 4:4:4 is such a word that you can't read it completely. Don't worry, the HD Fan will come to you.
First of all, speaking of YUV, in fact, YUV and RGB are a kind of color coding method, and RGB methods can convert between each other. As the RGB represents red, green and blue, the YUV three letters respectively represent the luminance signal and U, V two color difference signals.
The 4:4:4 represents YUV's three sampling methods for signal sampling. In addition to 4:4:4, 4:2:2, 4:2:0, and 4:1:1 sampling methods are common. format. In simple terms, the 4:4:4 signal is lossless, with richer information and better picture color, but it requires very high storage space and transmission bandwidth. The other three ways are to save bandwidth and storage space and to compress colors.
In fact, because the 4:4:4 signal data volume is too large, the storage and transmission costs are too high. So whether it is through the Blu-ray Disc, or network download, set-top boxes, various network boxes, the source of the film is compressed, and most of the 4:2:0, 4:1:1 compression, 4: 2:2 sources are rare. TVs that support YUV 4:4:4 do not make much sense when playing such sources.
However, in the current era of smart TVs, the sources of television signals are no longer limited to CD-ROM, network transmission channels, games, PCs, PS4, Xbox One, and even game applications in set-top boxes. Most of these locally generated video signals support With YUV 4:4:4 transmission, if you use YUV4:4:4 TV to display, the picture, color, and text display enhancement is very obvious.
Supplementary points: Why use YUV coding instead of simply coding in RGB? Because YUV's compression method has an inherent advantage over RGB, it is possible to separate the information of the outline and the color, compress only the color, and do not affect the outline. As shown in the above figure, the Y signal is Luma, which represents the brightness information. Intuitively, it is the outline. Whether it is 4:2:2 or 4:2:0 or 4:1:1, the luminance Y corresponds to 4, which means that the contour information will not be compressed. Compression is the compression of the color information. Diagram of the U and V signals represented by Chronma. The RGB compression of the three primary colors is more likely to affect the sharpness of the contour. YUV compression color is really a cost-effective compression method, but with the continuous development of technology and the audience's vision is increasingly "leaky", even the YUV4:4:4 which seems to be a very luxurious coding method can be Used on entertainment-grade TVs, this is something I couldn’t think of in the past.

What is HDR and what is it for?

HDR is short for High-Dynamic Range.
The difference in brightness between the natural world, that is, the brightness of the brightest object, and the brightness ratio of the darkest object can reach 100 million times, and the difference that the human eye can discern is about 100,000 times. General consumer digital cameras and monitors can only show 256 different brightness levels.
A low dynamic range can cause many problems. For example, when displaying bright and dark contrast images, bright areas appear white, dark areas are dark, and details of highlights and dark parts are lost.
With the advancement of technology and the increase in audience demands, in the film and television industry, more and more devices have used 10bit or even higher coding, have a higher latitude, and can collect and display a wider range of brightness information. However, in the end, the display of these films was displayed in front of the audience, and a large number of old devices manufactured using the SDR (Standard Dynamic Range of Brightness) 50 years ago seriously dragged back.
HDR TV technology, in simple terms, is capable of displaying a wider range of brightness information on a single screen, providing more detail and making the picture more vivid and three-dimensional. Buy new electronic products do not buy the old. If you happen to have the need to buy a TV, you might as well take HDR's ride and let your eyes take a baptism.
The tricks of the HDMI interface make it clear that you are not very interested. Are you ready to set up a new TV that meets the 4K standard and supports HDR and YUV 4:4:4? Ready to enjoy a visual feast? Slowly, here is another pit, HDMI. HDMI is a digital interface technology used to connect signal sources and televisions.
HDMI has different standards: 1.0, 1.1, 1.2, 1.3, 1.4, 2.0a, 2.0b, where 2.0a is the widest standard for bit width and can reach 18G. Simply put, it can be understood that HDMI is a freeway, audio and video signals are cars passing on the HDMI road, the low-standard HDMI interface is a two-way 2 lane, and the high-standard HDMI interface is a two-way 8 lanes. With the continuous advancement of television technology, the picture is getting better and better, and the amount of signal data carrying the picture is also getting larger and larger, requiring a wider path to carry.
For example, HDR technology mentioned earlier, compared with the old SDR, HDR needs more data to store brightness information. In other words, a 4k HDR chip source requires a higher transmission bandwidth than an ordinary 4k chip source. The 4k HDR chipset in the 4k resolution era also requires 4x more bandwidth than the 2k HDR chipset. Similarly, YUV 4:4:4,10bit technical specifications for improving the picture are all required for the bandwidth of the transmission interface.
If it is a 4k HDR 60p10bit signal source and it is still YUV 4:4:4, then the fastest HDMI cable may not be able to survive anymore. The signal data volume is too large and the traffic jam will cause the signal source to automatically reduce the color depth to 8bit. Even lower, to ensure the operation. Obviously spending money but not enjoying a big meal, is it anxious? The current solution is to replace the data cable of the DisplayPort 1.2 interface because the speed of the HDMI interface has not been able to keep up.
What? There is no DisplayPort connector on your TV? Pit is here: There is no DisplayPort interface, but claimed to support 4k HDR, YUV4: 4:4 TV manufacturers, this is not a rogue it?
In fact, some manufacturers often have lower limits, and even TVs don't even have HDMI 2.0 interfaces, and some only have 1.4 or even lower speed interfaces. If you don't just want to simply look at a picture, this product is best avoided. open.
With a different version of the HDMI cable for the 4K resolution of a variety of sources to support the extent of the table, you must choose to polish your own eyes.
Summing up so many theories, the article has written a large section, and the conclusion is:
1, 4 color 4K are pseudo 4K, real physical resolution can not reach 4K standard, belongs to Ming Sheng dark down products.

2, YUV4: 4:4 is a good thing, but if you are watching movies, because of the source of the film, it is of little significance; but if you are connected to a computer, even PS4, Xbox games, you can improve the quality, you can consider.

3, HDR is a new technology standard, the future trend, the actual improvement of the screen has practical help, based on buying new do not buy the old truth, recommend buying.

4, if you care about picture quality, you must pay attention to the HDMI interface TV, DP interface is better, there is no need to choose HDMI2.0 version, HDMI2.0a better than HDMI2.0b.

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