4K TV is arguably the most important field for TV manufacturers at the same time, and it is still in its infancy, and the overall development still belongs to the tip of the iceberg. So as an ordinary consumer, do you really understand 4K?
1. What should we know about 4K?
Simply put, 4K is a resolution value. Although not all consumers can immediately understand the principle of 4K, but in the simplest terms, 4K means that more pixels are brought on the screen .
2. How many pixels are there in 4K resolution?
There are about 8 million screen pixels in 4K, which is 4 times the 2 million pixels of traditional 1080p TVs. The pixels are calculated by multiplying the horizontal pixels by the vertical pixels. Therefore, the original 1920 × 1080 high-definition pixels are about 2 million, while 4K has reached 8 million.
3. Why is it called 4K?
Generally speaking, the name of 4K depends on the number of horizontal pixels of the display panel, but sometimes we will see the saying of 2160P, just like 1080P.
4. 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.
5. Is 4K the same as Ultra HD?
From a technical perspective, 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 is 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 UltraHD. But for consumers, the two resolutions are not too different, and the results are equally good.
6. What is the significance of 4K Ultra HD?
In fact, there are many reasons for making 4K TV the next area consumers should pay attention to. For example, for photographers, you can enjoy your work on a 4K TV and pay more attention to the details of the photo through the 2160p resolution.
The display details and effects of 4K are also significantly different from 1080p. Although different from 3D, 4K does not bring a qualitative change in the way of viewing, but the 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 clearer, and users can have a more advanced experience at the same distance. However, the size of a 4K TV must be greater than 50 inches to be effective.
7. How expensive is Ultra HD TV?
Looking back on the first batch of 4K TVs, the size is really not small. Both Sony and LG have launched 84-inch KD-84X9005 and 84LM960V products, so they also seem unambiguous in price, reaching £ 20,000 (approximately RMB 187,700) and £ 30,000 (approximately RMB 282,000 yuan). In addition, Samsung has not been outdone and launched an 85-inch 4K TV with a price of 35,000 pounds (about 329 thousand yuan).
However, as the size of the screen continues to decline, the price of 4K TVs continues to decrease, and now various manufacturers have begun a "price war." You will find that the lowest can even buy a 4K TV for less than 1,000 US dollars (about 6100 yuan). However, we still remind everyone that the display panels used for products of different prices are not the same.
Generally speaking, the more popular models on the market today, such as the Sony 65-inch 65X9005B, are priced at 3000 pounds (about 28,000 yuan), which is the mainstream price, and will also become cheaper.
8. How small can a 4K TV screen be?
In the short term, the most suitable size for 4K TVs will remain above 55 inches. This is because the screen needs to have enough space to arrange so many pixels, and considering the viewing distance and human eye recognition ability, 55 inches is the minimum size of a 4K TV. If it is less than 55 inches, the image upgrade effect brought by upgrading from 1080p to 4K is not obvious. Although high frame rate UHD broadcast signals can have a relatively large impact on picture quality, the benefits of HFR are not limited to screen size. If the second-generation 4K UHD technology is mature, then the high frame rate 4K signal will further reduce the size of the TV.
9. What is the best viewing distance for 4K TV?
4K Ultra HD brings a better visual experience than HD, and 4K can even bring us an effect comparable to a movie theater. Old-fashioned movie theaters generally have a distance of 3 to 5 screen heights, which is also the most comfortable viewing distance. The best viewing distance for modern movie theaters is 1.5 times the screen height, which can just fill the field of view. If at home, the most comfortable viewing distance for a 65-inch 4K TV is about 1.5 meters, but it seems that this is not realistic in many homes. So if you don't want to relocate the furniture, then 2 to 3 meters also has a good effect.
10. What is the prospect of 4K OLED?
OLED organic light-emitting diodes have been around for a while, but the biggest obstacle to this technology is the expensive price, which also consumes the opportunity for OLED to become a mainstream TV. This is actually a very big "shame" for the entire TV field. OLED TVs have been called top effects in terms of screen color, brightness and black level performance.
Therefore, only a few companies like LG will bring 4K ultra-high-definition OLED TVs. "I believe that 4K OLED TV will bring higher income and the price will gradually decrease." K Kwon, head of LG Electronics UK business unit, said. So although the current 4K OLED TV still belongs to the extremely niche field, it still cannot be ruled out as the mainstream TV type in the future.
11. What is the quantum dot technology appearing at CES?
To illustrate this problem, you really need a little physical knowledge. Simply put, quantum dots are a kind of nano material directly between 2-10 nanometers, a thin film is formed on the LED backlight of the LCD TV, and the blue LED can emit a full spectrum of light to illuminate the light. Adjustment, you can fine-tune the backlight, which greatly improves the color gamut performance and makes the colors more vivid. Both LG and Sony said that after using quantum dot technology, the color depth can be increased by 30% without adding additional pixels and algorithms.
At this CES, quantum dot technology was used for LG UF9400 and Samsung SUHD curved TV. It is expected that these TVs will be launched in the second quarter of 2015.
12. 4K TV channels?
There is currently no real 4K broadcast TV signal in the world. However, the DVB steering committee has approved the first phase of DVB-UHDTV specifications in July this year. By sending a signal of 3840 × 2160 pixels at a frame rate of 60Hz and adopting an 8-bit color standard, the quality of the picture will be improved. Significantly improved. In addition, the ETSI standard is expected to be launched soon, and broadcasters will begin to provide 4K signals in the future. At present, the main problem faced by the 4K broadcast signal is that it is not compatible with the set-top boxes in most consumers' homes, so this requires a round of upgrading process.
13. 4K content?
Currently YouTube provides a brand new 4K channel, but this also has high requirements for the graphics card of the personal computer, so this does not have a high reference significance. Perhaps you think that the lack of local 4K content is also the reason for limiting the development of 4K TVs, but through various technical treatments of 1080p, the results are also quite satisfactory.
In addition, Sony also released a number of 4K Blu-ray players. Although these are interpolated from 1080p, at least they also provide a wider color gamut than the standard Blu-ray disc. In the future, the advent of the 2160p standard Blu-ray disc is also an inevitable trend, and Sony also provides a small range of 4K movie download services in the US market.
14. How important is HDMI 2.0 to 4K and Ultra HD?
HDMI 2.0 is the latest HDMI standard. Although the existing HDMI 1.4 standard can also transmit 4K signals, it only supports a maximum of 30 frames, and most movies and TV broadcasters are looking for a better frame rate.
HDMI 2.0 can increase the bandwidth to 18Gbps, support 50K / 60fps 4K signal transmission, and 12bit4: 2: 2 color (you do n’t need any special HDMI 2.0 to access the high-speed network). However, only Panasonic has launched a TV with built-in HDMI 2.0 standard interface, the model is TX-L65WT600. In addition, Philips and Samsung have introduced custom TVs that can support upgrades. Sony is also looking for another way to increase the 8bit 4: 2: 0 range that HDMI 1.4 can withstand as high as possible, and it remains to be seen how effective it will be.
15. 4K is coming, what about 8K?
If 4K can provide 4 times the resolution of 1080p, then 8K will directly increase by 16 times, and the screen pixels will reach an astonishing 33 million. This is an order of magnitude that exceeds any of the currently available screens, and currently only NHK Broadcasting Corporation of Japan has indicated that it plans to continue researching this technology, and it has already been trial-run at the London Olympics. In addition, NHK has promised that it will officially start transmitting 8K signals at the 2020 Tokyo Olympics.
Of course, to bring 8K to the market will face huge challenges. 4K and HEVC are currently the best video compression technologies. However, 8K requires a screen larger than 84 inches to display the effect, so 8K is more suitable for commercial applications. Therefore, for ordinary consumers, 8K is still a relatively distant concept.
16. Should I start with 4K TV now? Still keep waiting
This really depends on the situation. If you do n’t mind if 4K TV is still a bit expensive, you can definitely start. If you choose the flagship products of the top manufacturers, I believe that they will not be outdated within a few years. But do n’t forget, within two to three years, do n’t expect to see real 4K video content. In addition, make sure that your TV uses the HDMI 2.0 interface (after all, the first 4K TVs still use the HDMI 1.3 standard).
On the other hand, if you are sensitive to price, then it ’s okay to wait. After all, with the passage of time, the price of 4K TVs will become lower and lower. At that time, changing a 4K TV is as easy as we are now changing to a 1080p HD TV.
1. What is a 4K TV
4K TV is a high-resolution TV with a physical resolution of 3840 × 2160 pixels, and its resolution is 4 times that of 2K TV. At this resolution, the viewer will be able to see every detail and every close-up in the picture. To get an immersive look and feel experience. 4K TV and can receive, decode, display the corresponding resolution video signal.
2. The main components (structure, parts) of 4K TV
4K TV structure and schematic diagram
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Display structure and schematic diagram
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Display panel glass
