Xiao Bian Comments: What is the difference between a real 4K?
Standards are five elements
As early as 2012, the International Telecommunications Union Radiocommunication Sector (ITU-R) issued a new generation of ultra high-definition video production and display system BT.2020 standard, redefining the fields of consumer electronics and television signal transmission, etc. on ultra-high definition video display. The parameters of the indicators. In the summer of last year, Blu-ray Disc Association’s official BDA option announced the 4K Ultra HD Blu-ray Ultra HD Blu-ray standard. Last month, the UHD Alliance once again put forward the true 4K standard Ultra HD Premium, so in fact we have just ushered in the spring of true 4K to the market.
Combined with many aspects of the standard, True 4K has five significant features: 4K resolution 60 frame refresh rate, BT.2020 10bit color detail, HDR high dynamic contrast, HDMI 2.0 data connection, H.265 hard decoding. Different equipments need to meet the parameter standards according to relevant properties.
1, 4K HD and 60 frame refresh rate
According to the standards of the Radiocommunication Sector of the International Telecommunication Union, true 4K resolution on the picture output and display should be 4096×2160 and 3840×2160, and the picture frame rate should be at least 60 frames. These two indicators are hard indicators and are applicable to either signal source processing, playback systems, or display systems.
2, BT.2020 10bit color depth
BT.2020 standard color gamut comparison
The new BT.2020 standard significantly improves the requirements for color display performance compared to the industry-accepted BT.709 standard. The color depth is increased from 8 bits to 10 bits, which effectively improves the 8-bit color-level blocks caused by video jitter. That is, we often observe similar “terraced†color shades on TV. This further reduces the picture quality noise to give the user a better experience. In terms of color gamut, the new standard provides 78.5% color gamut coverage compared to the traditional standard, compared with 38.5% for the previous generation standard and almost double the color gamut. In the future when you purchase a TV, if a TV is nominally 4K, but the color gamut is less than 78.5%, it is basically a child.
3, HDR high dynamic contrast
At present, some of the selling points of TV on the market are HDR high dynamic contrasts. In fact, this is one of the current 4K standards. Friends who are familiar with the function of mobile phone should immediately understand its significance. HDR high dynamic contrast can reply to enhance the picture quality, bring more vivid picture effects, enhance the contrast, intelligently adjust the brightness of the screen area, adjust the color gamut, make the picture more attractive. The darkness enhances the brightness at the same time it can also show rich details, so that the bright part of the screen brightness.
4, HDMI 2.0 data connection
HDMI 2.0 This is a standard for data transmission, so both the playback device and the display output device must support HDMI 2.0 to be a complete true 4K output. HDMI 2.0 compared to the previous 1.4 version of the main improvement is reflected in the entire bandwidth to double, from the previous 4K/30Hz output to 4K/60Hz. Of course, your other equipment must match before preparing the wire.
5, H.265 decoding
As a standard on the player side, H.265 decoding is a must-have item because the current suppression method of the true 4K source from the source is H.265 encoding. Whether it is from Blu-ray player playback output or TV box decoding source file output, this basic function is required, and the final output screen will meet the standard.
It is not easy to enjoy true 4K picture quality at this stage
Although we have captured the imagination and introduced the 4K Ultra HD, which is the 4K standard that we commonly call, we are also getting closer to the real 4K in the industry development. Many products are equipped with one or more of the 4K standards. The standard thus becomes a selling point. However, users really want to experience the charm of true 4K at this stage is still very difficult. The main reason comes from several aspects:
The first cause is the operator's server. When you turn on the TV, you will find that more and more of the TV signals now cover the Full HD channel, but still 2/3 of the channels still provide only "slag quality" signal source. The backward TV signal output environment in which full-HD quality is not yet universally popular, and what are we talking about in the daily use of real 4K? Therefore, in the Internet age, TV and licensees operators will only be out of the ordinary business development will be eliminated, expand the information pipeline to the development of composite digital service providers, this is an effective transformation of the road. In addition Blu-ray player playback is difficult to get a full sense of popularity, not only the price of the player is expensive, and Blu-ray disc prices are not cheap, it is difficult for ordinary families to choose this playback to experience true 4K.
Http://v.qq.com/page/q/k/h/q017943ldkh.html
Detachable Laptop Stand,Foldable Detachable Computer Stand,Detachable Ergonomic Laptop Stand,Detachable And Foldable Aluminum Laptop Stand
Shenzhen ChengRong Technology Co.,Ltd. , https://www.nblaptopstandsupplier.com