China Home Theater Network () has recently continued to develop new technologies in the audio-visual industry. In addition to Dolby panoramic sound technology, which is sweeping through major theaters and movie studios, 4K in video is also developing rapidly. With the warming of 4K technology, there are many 4K TVs on the market, and the price difference is also very large. Take the common 55å‹ as an example. The most expensive one may be close to 20,000 yuan, and the cheapest one is only 4 or 5,000 yuan. There is a saying that cheap 4K TVs use RGBW technology, so it is not a true 4K TV. So, is RGBW's 4K TV really a 4K TV? How to choose a real 4K TV? The following small series will introduce in detail:
4K standard on TV
The standards for 4K TVs and 4K movies are still different. At present, the definition of 4K passage in the TV industry is: the physical resolution of the TV screen reaches 3840×2160. In the international standard of Ultra HDTV released by the International Telecommunication Union (ITU) on August 23, 2012, the definition of Ultra HD 4K is: horizontal definition 3840, vertical resolution 2160, wide The ratio is 16:9, which is about 8.3 million pixels.
What is RGBW technology?
In the conventional liquid crystal technology, each pixel is composed of sub-pixels of three colors of R/G/B. However, the RGBW technology adds white sub-pixels to the R/G/B, which means that the RGBW liquid crystal panel has four color sub-pixels.
The traditional RGB technology of the liquid crystal sub-pixel close-up, red, green, blue three color sub-pixels constitute a complete pixel, and the real RGBW technology into the "pseudo 4K" argument is: RGBW technology is not in every pixel Both add a separate white sub-pixel, but use sub-pixel sharing, whether it is Samsung SDI or LG Display RGBW panel of Korea, using similar means. That is to say, in the traditional RGB 4K panel, each pixel has 3 color sub-pixels; in the 4K panel of RGBW, each pixel may average only 2-3 color sub-pixels (in fact, this It is not a rigorous way of expression, but it is very easy for ordinary readers to understand).
The sub-pixel structure diagram of RGBW 4K panel, the sub-pixel has a multiplexing relationship. Taking LG's RGBW panel technology as an example, its screen physical resolution is still 3840×2160, and the total number of pixels is also 8.3 million. However, the number of sub-pixels of RGBW four colors is 1/4 of 8.3 million respectively; while in traditional RGB 4K TV, the total number of pixels on the screen is 8.3 million, but the number of sub-pixels per color is 8.3 million respectively. 3.
Is RGBW 4K really 4K?
First of all, from the characteristics of RGBW 4K, the physical parameters of this panel are in line with ITU's definition of 4K. The reason why it is called pseudo 4K is that the pixel actually uses the means of multiplexing, and the static distortion actually perceived by the human eye is slightly lower than that of RGB 4K.
Even though the static resolution of the RGBW 4K panel is slightly lower than that of the RGB 4K panel, it is said that RGBW 4K is a pseudo-science. Because the true 4K TV is not only a 4K panel, but also has 4K signal processing, transmission, decoding capabilities, otherwise there is the possibility of "pseudo 4K".
How to distinguish seriously 4K
At present, there is no compulsory certification for 4K TV in the country. If you want to buy a real 4K TV, there are two methods that are more reliable:
1. Purchase high-end products from the first-line brand. For example, Sony, Samsung's high-end 4K TV, although the price is very expensive, but a penny of goods, quality and function are guaranteed. If these products are pseudo 4K, then there may be no real 4K on the market.
The domestic CESI Saiwei certification is a third-party organization that has early involvement in the definition of resolution in the TV field. Currently, there are related certifications for 4K.
2. See third-party certification. At present, there are some organizations in China and internationally that certify the 4K resolution of TV sets (such as domestic Sai Sai certification). These professional certifications not only test the static definition of TV sets, but also test the color of TVs. Professional testing in terms of viewing angle, contrast, dynamic resolution, 4K signal compatibility, etc. 4K TVs that have been certified by professional organizations can also guarantee the corresponding image effects. If you have doubts in this regard, please pay attention to the official homepage (cnhifi) of China Home Theater Network, we are happy to solve the problem for you.
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