Now the TV market is pushing 4K TVs all the time. From foreign brands to domestic brands, 4K has become the hottest “flower†in the TV market. Although 4K is hot, many people do not know much about 4K TV. How much do you know about 4K TV? Today Xiaobian brings the most comprehensive 4K knowledge in history.
Everyone wants 4K, but nobody knows why. As the most popular vocabulary, the impact of 4K is not only simpler than improving the picture quality.
Almost all mainstream TV manufacturers on the market have already adopted 4K as the standard for new products. Whether it is Samsung, Panasonic, Sony, LG, Sharp, Panasonic, or Vizio, this technology can almost be seen as a complete subversion of display devices. Quality means. 4K not only affects TV and movies, but also includes cameras, smart phones, tablet PCs, computer monitors and games. In almost any area related to images or video, we will all see 4K.
In addition, in addition to television, cameras, smart phones, tablets, monitors, etc., all impact-related products began to appear in the concept of 4K. 4K can be said to be the most important field for TV manufacturers, and at the same time it is still in its infancy. The overall development still belongs to the tip of the iceberg. So as an ordinary consumer, do you really understand 4K?
How much does 4K TV know? Detailed 4K knowledge
What should we know about 4K?
To put it simply, 4K is a kind of resolution value. Although it cannot allow all consumers to immediately understand the principle of 4K in a short time, in the simplest terms, 4K means that more pixels are brought on the screen. .
How many pixels in 4K resolution
There are about 8 million screen pixels in 4K, which is 4 times that of 2 million pixels in traditional 1080p TV. Pixels are calculated by multiplying horizontal pixels by vertical pixels. So the original 1920×1080 HD pixel is about 2 million, while the 4K is 8 million.
Why is it called 4K
Generally speaking, 4K's name depends on the number of horizontal pixels in the display panel, but sometimes we will see the 2160P's statement, just like 1080P.
How important is the pixel
Extra pixels are very important, more pixels means more information and a clearer picture, making the overall visual effect look more advanced.
Is 4K the same as Ultra HD?
On the technical level, Ultra HD is actually a concept derived from the 4K digital standard. The standard 4K resolution can reach 4096×2160 pixels locally, while Ultra HD should be slightly lower, with a resolution of 3840×2160 pixels.
This is why some brands or models do not use 4K tags, but claim to be Ultra HD Ultra HD. However, for the consumer, the two resolutions are not too obvious and the results are all excellent.
The meaning of 4K Ultra HD
In fact, there are many reasons that can make 4K TV the next area that consumers should pay attention to. For photographers, for example, they can enjoy their work on a 4K TV and pay attention to the details of the photo through 2160p resolution.
The 4K is obviously different from 1080p in terms of display details and effects. Although different from 3D, 4K does not bring a qualitative change in the viewing mode, but higher resolution can make the image more attractive. In addition, the high pixel density brought by 4K can make the structure of the image itself more clear, and the user can have a more advanced experience at the same distance. However, the size of a 4K TV must be at least 50 inches larger.
How expensive is Ultra HD TV?
Looking back at the first 4K TVs, the size is really not small. Both Sony and LG have introduced 84-inch KD-84X9005 and 84LM960V products, so they also appear to be unambiguous in terms of price, reaching 20,000 pounds (approximately 194,600 yuan) and 30,000 pounds (approximately 292,000 yuan) respectively. yuan). In addition, Samsung is also unwilling to launch an 85-inch 4K TV with a price of 35,000 pounds (about 341,000 yuan).
However, as the screen size continues to drop and the prices of 4K TVs continue to decrease, various manufacturers are now starting to "price war." You will find that you can buy 4K TV at a price of less than 1,000 US dollars (about 6100 yuan). However, we still remind everyone that the display panels used by different price products are not the same.
Generally speaking, the more popular models on the market, such as the Sony 65-inch 65X9005B, priced at 3,000 pounds (about 2.9 million yuan), is the mainstream price, and it will also become cheaper.
How small a 4K TV screen can be
In the short term, the most suitable size of the 4K TV will remain at 55 inches or more. This is because the screen needs to have enough space to arrange so many pixels, and considering the viewing distance and the recognition ability of human eyes, 55 inches is the smallest size of a 4K TV. If it's less than 55 inches, the image upgrade from 1080p to 4K is not obvious. Although high frame rate UHD broadcast signals can have a large impact on picture quality, the benefits of HFR are not limited to screen size. If the second-generation 4K UHD technology matures, the high frame rate 4K signal will further reduce the TV size.
The best viewing distance for 4K TV
4K Ultra HD brings a better visual experience than HD, and 4K can even bring us the same effect as a movie theater. Old-fashioned cinemas are generally at a distance of 3 to 5 screen heights, which is also the most comfortable viewing distance. The best viewing distance in a modern movie theater is 1.5 times the screen height. This distance can fill the field of interest. If at home, then the most comfortable viewing distance for a 65-inch 4K TV is about 1.5 meters, but this seems unrealistic in many homes. So if you don't want to reposition the furniture, then 2 to 3 meters will have a good effect.
4K OLED prospects
OLED organic light-emitting diodes have been around for some time, but the biggest obstacle to this technology is the expensive price, which also consumes OLEDs to become mainstream TVs. This is actually a very large "shame" for the entire TV field. OLED TVs have been rated as top-level effects in terms of picture color, brightness, and black level performance.
Therefore, currently only a few companies like LG will bring 4K Ultra HD OLED TVs. "I believe that 4K OLED TVs will bring higher profits and prices will gradually decrease," said K Kwon, head of the British division of LG Electronics. So even though 4K OLED TVs are still in an extremely niche area, they still cannot be ruled out as the mainstream type of TV in the future.
What is Quantum Dot Technology at CES?
To illustrate this issue, you really need a little physics knowledge. Simply put, a quantum dot is a nanomaterial that is directly between 2 and 10 nanometers. It forms a thin film on the LED backlight of an LCD TV. With a blue LED, it can emit full-spectrum light, which makes it possible to carry out light. Adjustment can finely adjust the backlight, which can significantly enhance the performance of the color gamut and make the color more vivid. LG and Sony both stated that using quantum dot technology can increase color depth by 30% without adding extra pixels and algorithms.
At this CES, quantum dot technology was used in LG UF9400 and Samsung SUHD curved TVs. It is expected that these TVs will begin to be listed in the second quarter of 2015.
4K TV channel
At present, there are no real 4K broadcast television signals in the world. However, the DVB Steering Committee has already approved the first phase of the DVB-UHDTV specification in July this year. By sending a 3840×2160 pixel signal at a frame rate of 60 Hz and using an 8-bit color standard, there will be Significant improvement. In addition, ETSI standards are expected to be launched soon. In the future, broadcasters will begin to provide 4K signals. The main problem facing the current 4K broadcasting signals is that they are not compatible with the set-top boxes in most consumers' homes, so this also requires a round of updating.
4K content
Currently YouTube offers a brand-new 4K channel, but this also has very high requirements for the graphics card of the personal computer, so this is not too high reference value. Maybe you think that the lack of local 4K content is also the reason that restricts the development of 4K TV. However, through the various technical processing of 1080p, the effect brought by it is relatively satisfactory.
In addition, Sony also released a number of 4K Blu-ray players, although these are interpolated from 1080p, but at least provide a wider color gamut than the standard Blu-ray. The advent of the future 2160p standard Blu-ray disc is also an inevitable trend, while Sony also provides a small range of 4K movie download services in the US market.
What kind of cable do I need?
There are currently two types of cables that are compatible with 4K signals, including HDMI and DisplayPort.
HDMI cables currently have two standards, HDMI 1.4 and 2.0. The 1.4 cable is very inexpensive and can be purchased at any local electronics retailer. HDMI 1.4 can output 3820 × 2160 pixels / 30fps quality video, and HDMI 2.0 is the latest standard, you can improve the 3820 × 2160 pixel resolution video quality to 60fps.
The other is DisplayPort, which can display any 4K signal through a high-end graphics card without any delays or stalls.
How important HDMI 2.0 is to 4K and Ultra HD
HDMI 2.0 is the latest standard of HDMI. Although the existing HDMI 1.4 standard can also transmit 4K signals, it supports a maximum of 30 frames. Most movie and TV broadcast companies are looking for better frame rates.
HDMI 2.0 can increase bandwidth to 18Gbps, support 4K signal transmission at 50/60fps, and 12 bit 4:2:2 color (you don't need any special HDMI 2.0 access to high speed network). However, only Matsushita has introduced a TV built-in HDMI 2.0 standard interface, model TX-L65WT600. In addition, Philips and Samsung have introduced custom TVs that support upgrades. Sony is also looking for another way to maximize the 8bit 4:2:0 range that HDMI 1.4 can withstand. It remains to be seen how effective it will be.
4K, then 8K?
If 4K can provide 4 times the resolution of 1080p then 8K will increase directly by 16 times, the screen pixel has reached an astonishing 33 million. This is an order of magnitude beyond any currently available screen.
And currently only Japan’s NHK Broadcasting Company has indicated that it plans to continue researching this technology and has already been running trials at the 2018 London Olympics. In addition, NHK has promised to begin officially sending 8K signals at the 2020 Tokyo Olympic Games.
Of course, to bring 8K to the market is a huge challenge. 4K and HEVC are currently the best video compression technologies. However, because 8K needs more than 84 inches of screen to show the effect, 8K is more suitable for commercial applications. Therefore, for the average consumer, the current 8K is still a relatively distant concept.
Should you start 4K TV now? Or continue to wait
This really depends on the situation. If you don’t mind that 4K TV is still somewhat expensive, you can definitely start with it. If you choose from the top manufacturers of the flagship product, I believe that will not be outdated within a few years. But don't forget, within two to three years, don't expect to see real 4K video content. Also, make sure that your TV is using the HDMI 2.0 interface (after all, the first 4K TV still uses the HDMI 1.3 standard).
On the other hand, if you are sensitive to price, then wait. After all, over time, the price of 4K TVs will get lower and lower. It will be as easy as changing a 4K TV now like we are now replacing a 1080p HDTV.
Everyone wants 4K, but nobody knows why. As the most popular vocabulary, the impact of 4K is not only simpler than improving the picture quality.
Almost all mainstream TV manufacturers on the market have already adopted 4K as the standard for new products. Whether it is Samsung, Panasonic, Sony, LG, Sharp, Panasonic, or Vizio, this technology can almost be seen as a complete subversion of display devices. Quality means. 4K not only affects TV and movies, but also includes cameras, smart phones, tablet PCs, computer monitors and games. In almost any area related to images or video, we will all see 4K.
In addition, in addition to television, cameras, smart phones, tablets, monitors, etc., all impact-related products began to appear in the concept of 4K. 4K can be said to be the most important field for TV manufacturers, and at the same time it is still in its infancy. The overall development still belongs to the tip of the iceberg. So as an ordinary consumer, do you really understand 4K?
How much does 4K TV know? Detailed 4K knowledge
What should we know about 4K?
To put it simply, 4K is a kind of resolution value. Although it cannot allow all consumers to immediately understand the principle of 4K in a short time, in the simplest terms, 4K means that more pixels are brought on the screen. .
How many pixels in 4K resolution
There are about 8 million screen pixels in 4K, which is 4 times that of 2 million pixels in traditional 1080p TV. Pixels are calculated by multiplying horizontal pixels by vertical pixels. So the original 1920×1080 HD pixel is about 2 million, while the 4K is 8 million.
Why is it called 4K
Generally speaking, 4K's name depends on the number of horizontal pixels in the display panel, but sometimes we will see the 2160P's statement, just like 1080P.
How important is the pixel
Extra pixels are very important, more pixels means more information and a clearer picture, making the overall visual effect look more advanced.
Is 4K the same as Ultra HD?
On the technical level, Ultra HD is actually a concept derived from the 4K digital standard. The standard 4K resolution can reach 4096×2160 pixels locally, while Ultra HD should be slightly lower, with a resolution of 3840×2160 pixels.
This is why some brands or models do not use 4K tags, but claim to be Ultra HD Ultra HD. However, for the consumer, the two resolutions are not too obvious and the results are all excellent.
The meaning of 4K Ultra HD
In fact, there are many reasons that can make 4K TV the next area that consumers should pay attention to. For photographers, for example, they can enjoy their work on a 4K TV and pay attention to the details of the photo through 2160p resolution.
The 4K is obviously different from 1080p in terms of display details and effects. Although different from 3D, 4K does not bring a qualitative change in the viewing mode, but higher resolution can make the image more attractive. In addition, the high pixel density brought by 4K can make the structure of the image itself more clear, and the user can have a more advanced experience at the same distance. However, the size of a 4K TV must be at least 50 inches larger.
How expensive is Ultra HD TV?
Looking back at the first 4K TVs, the size is really not small. Both Sony and LG have introduced 84-inch KD-84X9005 and 84LM960V products, so they also appear to be unambiguous in terms of price, reaching 20,000 pounds (approximately 194,600 yuan) and 30,000 pounds (approximately 292,000 yuan) respectively. yuan). In addition, Samsung is also unwilling to launch an 85-inch 4K TV with a price of 35,000 pounds (about 341,000 yuan).
However, as the screen size continues to drop and the prices of 4K TVs continue to decrease, various manufacturers are now starting to "price war." You will find that you can buy 4K TV at a price of less than 1,000 US dollars (about 6100 yuan). However, we still remind everyone that the display panels used by different price products are not the same.
Generally speaking, the more popular models on the market, such as the Sony 65-inch 65X9005B, priced at 3,000 pounds (about 2.9 million yuan), is the mainstream price, and it will also become cheaper.
How small a 4K TV screen can be
In the short term, the most suitable size of the 4K TV will remain at 55 inches or more. This is because the screen needs to have enough space to arrange so many pixels, and considering the viewing distance and the recognition ability of human eyes, 55 inches is the smallest size of a 4K TV. If it's less than 55 inches, the image upgrade from 1080p to 4K is not obvious. Although high frame rate UHD broadcast signals can have a large impact on picture quality, the benefits of HFR are not limited to screen size. If the second-generation 4K UHD technology matures, the high frame rate 4K signal will further reduce the TV size.
The best viewing distance for 4K TV
4K Ultra HD brings a better visual experience than HD, and 4K can even bring us the same effect as a movie theater. Old-fashioned cinemas are generally at a distance of 3 to 5 screen heights, which is also the most comfortable viewing distance. The best viewing distance in a modern movie theater is 1.5 times the screen height. This distance can fill the field of interest. If at home, then the most comfortable viewing distance for a 65-inch 4K TV is about 1.5 meters, but this seems unrealistic in many homes. So if you don't want to reposition the furniture, then 2 to 3 meters will have a good effect.
4K OLED prospects
OLED organic light-emitting diodes have been around for some time, but the biggest obstacle to this technology is the expensive price, which also consumes OLEDs to become mainstream TVs. This is actually a very large "shame" for the entire TV field. OLED TVs have been rated as top-level effects in terms of picture color, brightness, and black level performance.
Therefore, currently only a few companies like LG will bring 4K Ultra HD OLED TVs. "I believe that 4K OLED TVs will bring higher profits and prices will gradually decrease," said K Kwon, head of the British division of LG Electronics. So even though 4K OLED TVs are still in an extremely niche area, they still cannot be ruled out as the mainstream type of TV in the future.
What is Quantum Dot Technology at CES?
To illustrate this issue, you really need a little physics knowledge. Simply put, a quantum dot is a nanomaterial that is directly between 2 and 10 nanometers. It forms a thin film on the LED backlight of an LCD TV. With a blue LED, it can emit full-spectrum light, which makes it possible to carry out light. Adjustment can finely adjust the backlight, which can significantly enhance the performance of the color gamut and make the color more vivid. LG and Sony both stated that using quantum dot technology can increase color depth by 30% without adding extra pixels and algorithms.
At this CES, quantum dot technology was used in LG UF9400 and Samsung SUHD curved TVs. It is expected that these TVs will begin to be listed in the second quarter of 2015.
4K TV channel
At present, there are no real 4K broadcast television signals in the world. However, the DVB Steering Committee has already approved the first phase of the DVB-UHDTV specification in July this year. By sending a 3840×2160 pixel signal at a frame rate of 60 Hz and using an 8-bit color standard, there will be Significant improvement. In addition, ETSI standards are expected to be launched soon. In the future, broadcasters will begin to provide 4K signals. The main problem facing the current 4K broadcasting signals is that they are not compatible with the set-top boxes in most consumers' homes, so this also requires a round of updating.
4K content
Currently YouTube offers a brand-new 4K channel, but this also has very high requirements for the graphics card of the personal computer, so this is not too high reference value. Maybe you think that the lack of local 4K content is also the reason that restricts the development of 4K TV. However, through the various technical processing of 1080p, the effect brought by it is relatively satisfactory.
In addition, Sony also released a number of 4K Blu-ray players, although these are interpolated from 1080p, but at least provide a wider color gamut than the standard Blu-ray. The advent of the future 2160p standard Blu-ray disc is also an inevitable trend, while Sony also provides a small range of 4K movie download services in the US market.
What kind of cable do I need?
There are currently two types of cables that are compatible with 4K signals, including HDMI and DisplayPort.
HDMI cables currently have two standards, HDMI 1.4 and 2.0. The 1.4 cable is very inexpensive and can be purchased at any local electronics retailer. HDMI 1.4 can output 3820 × 2160 pixels / 30fps quality video, and HDMI 2.0 is the latest standard, you can improve the 3820 × 2160 pixel resolution video quality to 60fps.
The other is DisplayPort, which can display any 4K signal through a high-end graphics card without any delays or stalls.
How important HDMI 2.0 is to 4K and Ultra HD
HDMI 2.0 is the latest standard of HDMI. Although the existing HDMI 1.4 standard can also transmit 4K signals, it supports a maximum of 30 frames. Most movie and TV broadcast companies are looking for better frame rates.
HDMI 2.0 can increase bandwidth to 18Gbps, support 4K signal transmission at 50/60fps, and 12 bit 4:2:2 color (you don't need any special HDMI 2.0 access to high speed network). However, only Matsushita has introduced a TV built-in HDMI 2.0 standard interface, model TX-L65WT600. In addition, Philips and Samsung have introduced custom TVs that support upgrades. Sony is also looking for another way to maximize the 8bit 4:2:0 range that HDMI 1.4 can withstand. It remains to be seen how effective it will be.
4K, then 8K?
If 4K can provide 4 times the resolution of 1080p then 8K will increase directly by 16 times, the screen pixel has reached an astonishing 33 million. This is an order of magnitude beyond any currently available screen.
And currently only Japan’s NHK Broadcasting Company has indicated that it plans to continue researching this technology and has already been running trials at the 2018 London Olympics. In addition, NHK has promised to begin officially sending 8K signals at the 2020 Tokyo Olympic Games.
Of course, to bring 8K to the market is a huge challenge. 4K and HEVC are currently the best video compression technologies. However, because 8K needs more than 84 inches of screen to show the effect, 8K is more suitable for commercial applications. Therefore, for the average consumer, the current 8K is still a relatively distant concept.
Should you start 4K TV now? Or continue to wait
This really depends on the situation. If you don’t mind that 4K TV is still somewhat expensive, you can definitely start with it. If you choose from the top manufacturers of the flagship product, I believe that will not be outdated within a few years. But don't forget, within two to three years, don't expect to see real 4K video content. Also, make sure that your TV is using the HDMI 2.0 interface (after all, the first 4K TV still uses the HDMI 1.3 standard).
On the other hand, if you are sensitive to price, then wait. After all, over time, the price of 4K TVs will get lower and lower. It will be as easy as changing a 4K TV now like we are now replacing a 1080p HDTV.
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