With the advancement of technology, many digital products are also advancing. Like the originally slow-moving TV products, the changes in recent years can be said to be rapid progress, from raw TV to smart TV, from high definition image quality to 4K image quality, from CRT. To the LCD panel, it can be said that the user is unable to keep up with, almost can not keep up with the rhythm, but to say what is the most hot now, it is undoubtedly 4K picture quality configuration, this HD effect, allows users to experience a more stunning picture quality The effect, in fact, is that many brands are currently following up on 4K TV products. However, judging from the current situation, it is still not recommended to purchase domestically produced 4K TVs, because at these three points, domestic products are far inferior to imported products.
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The effect can be discerned by the naked eye:
Some 4K TVs have a significant difference in picture quality. Store sales personnel explained that the picture quality of 4K TV is related to the source of the film. Even if it is a 4K TV, when it plays a 2K source, the effect it presents is also related to 2K TV. In addition, when playing the same 4K source, domestically produced TVs do not have a good effect on foreign TV products such as Samsung and Sony.
In fact, in 2014, the China Household Electrical Appliances Association pointed out that the so-called “approximate 4K†television appeared on the market, its panel resolution could not reach 3840×2160, and this led to a round of debate in the industry.
Zhang Hong, deputy director of the Digital TV Standard Compliance Testing Center of the Ministry of Industry and Information Technology, stated that only TV products that can receive, process, and display 3840×2160 pixel resolution can be said to be 4K products. This is an implication. Those that fail to meet this standard are “approximateâ€. 4K "TV, NPD DisplaySearch LCD TV analysis director Yang Jingping revealed:" In order to reduce the cost of 4K panels, panel makers have developed a 4K panel, called RGBW or GreenUHD, which began shipping in the second quarter of 2014. Many products are currently available. All of these panels are being used." So what's the difference between these two types of panels?
There is a difference of 2 million in the same 4K pixel:
The "K" in "4K" is the first letter of the English "kilo" (thousands), which represents one thousand, 4K is 4,000, which means that there are about 4000 pixels in the horizontal direction. For convenience of calling, 3840 pixels are called 4K. . The UHD (Ultra-HD) TV refers to a TV with a screen resolution and a pixel number that is 4 times higher than that of a normal FHD (Full-HD) TV. Here, the pixel consists of three sub-pixels RGB: red (R), green (G), and blue (B), and the three primary colors display various colors through matching of different proportions.
On the other hand, the above-mentioned "economical UHD" television adopts an RGBW panel, which is to replace some RGB sub-pixels with white (W). Display industry professionals pointed out: “The RGBW mode adds white sub-pixels, so the line looks like a dotted line. Because the number of RGB pixels is insufficient, the brightness of other colors except white is reduced and the color is uneven.†The actual pixels of RGBW can only be Reached 3/4 of 4K resolution (2880x2160). Therefore, according to such an algorithm, such a television should be called a 3K television.
Compared with a real 4K panel, the RGBW 4K panel has about 2 million fewer pixels. In fact, the disadvantages are not limited to these. Since W is not a valid color pixel, it will undoubtedly affect the color purity of the panel and the performance of the picture details. Although the problem may be improved by the algorithm and panel optimization, compared with the real RGB 4K panel There will always be a gap in the screen's expressiveness, which is why the top products of Dachang do not use such cheap 4K panels.
Obviously, the so-called "near 4K" panel is a "new product" developed for the low-end 4K market. Their lower system cost will help manufacturers produce cheaper 4K TVs to meet the needs of some consumers, but In terms of picture quality, it is obviously impossible to match RGB 4K panels. If openly branded "4K UHD TV", pricing and real 4K products at the same level, for consumers, is tantamount to deception!
Chinese UHD standard is missing:
In fact, this kind of approximate 4K TV has caused a lot of controversy abroad. The United States and Europe have implemented strict consumer protection standards and the "RGBW Panel" UHD concept has prevailed.
The German Institute of Electrical and Electronics Engineers (VDE) tested low-cost UHD TVs and classified those TVs in question as "products that cannot meet the UHD resolution standard." And DE (Digital Europe), another European authority, emphasized that "UHD TVs must include full RGB tri-colors, with 4 times the definition of Full HD." DE introduced relevant certification marks to issue certification marks for real 4K UHD TVs. The Consumer Electronics Association of the United States (CEA) and European DE share the same view: "The pixels should consist of three sub-pixels: red (R), green (G), and blue (B)."
It is reported that this kind of 3K TV with RGBW panel can not meet the UHD TV standards set by European DE (Digital Europe) and the United States Consumer Electronics Association (CEA) and cannot be sold in European and American markets. In countries and regions that have not yet introduced relevant regulations, such as China, Southeast Asia, and other regions, they will sell their products. If consumers do not look closely at the product specifications, they may be able to buy "half" 3K TVs.
Detection method:
The China Household Electrical Appliances Association introduced a method to distinguish between genuine and fake 4K TVs: fake 4K can be identified by eyes, and false 4K is blurred in color. If you look in a magnifying glass, you can see the white line. In the face of the global UHD era, the home appliance and imaging industries must provide consumers with high-quality products, as well as correct information labels and services.
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