PConline technology analysis on the recent network on the true and false 4K TV things quarreled loudly, at first glance, various concepts, what 8bit+Hi FRC, what RGBW and RGB, to tell the truth Xiaobian looked also confused, so There was an idea of ​​investigating the article. First of all, this article does not have a pre-defined position and does not aim at any brand. It only provides information that the author has collected so that we can rationally judge the product we are going to start with, and that's it.
Cause
After the smart TV card played similarly, Chaoqing TV ushered in a big explosion last year. With the global supply growth, some agencies predict that the 4K TV market shipments will increase from 1.6 million units in 2013 to 1,230 in 2014. Million. According to the Quarterly Global TV Shipment and Forecast Report by NPD Display Search, by 2017, the proportion of 4K panels in 50-inch and above LCD TVs will reach 93%, which is equal to the previous FHD occupation. The situation in the LCD TV market is similar.
It is reported that the ASP of Chinese 4K TVs is nearly 72% lower than other regions. Although consumer acceptance and reverberation of 4K TVs remains to be seen, this does not affect the aggressive shipment targets set by panel makers and TV brand makers in this year, especially Chinese TV brands. â€
Yang Jingping, director of LCD TV analysis at NPD DisplaySearch, said: “In order to reduce the cost of 4K panels, panel makers have developed a 4K panel called RGBW or GreenUHD, which will be shipping in the second quarter of 2014.†As was previously the agency is As stated in the Quarterly Large-Area TFT LCD Product Roadmap Report, Samsung Electronics and LG Display have developed a low-cost 4K panel called RGBW and plan to focus on selling this product to the Chinese market. Incomparable with Innolux, China Star and AUO .
What is RGBW? How is it different from the traditional 4K panel? Why is it called GreenUHD or GreenPlusUHD? The following figure is a comparison of various 4Kx2K panel technologies. The following are the existing data on the Internet. We will quote them first and then add our analysis.
Comparison of various 4Kx2K panel technologies (data from DisplaySearch)
The original picture has some errors. The author made a correction to the PS.
As shown above, the traditional pixel consists of R (red), G (green), and B (blue). The pixel of the FHD panel is 1920×1080, and each pixel is composed of three sub-pixels (R, G, B), so it has a total of 6.2 million colors ( here the original text, according to the original understanding should be 6.2 million Pigment point, the same below . The resolution of the 4K panel is 3840×2160, which means it has 24.9 million colors (3840×2160 pixels, each pixel consists of three sub-pixels). Therefore, the resolution of UHD (4K) is four times that of FHD (2K x 1K).
About Pixels
The word pixel is also the first time I saw it. According to literal meaning, it should refer to a definition defined by red, green and blue sub-pixels that can display rich colors on the TV display screen .
Because ideally, we want the display device to display a picture that consists of a single point, but in the process of realizing the LCD panel, it is not feasible to display the color picture at a single point. It needs to pass through the red, green and blue. To color the three primary colors, as long as the crystal lattice of red, green and blue is made small enough, it can fool the eyes and make it think that this is only a color pixel, so there is a definition of pixel.
Although the principle is the same, the RGBW4K panel developed by Samsung and LG Display is slightly different from the traditional 4K panel. In addition to RGB, a sub-pixel, white (W), is added to the pixel. With the increase of sub-pixels, RGBW4K panels can also achieve higher resolution. Samsung Electronics refers to its RGBW panel as GreenUHD and LGDisplay as G+UHD.
In Samsung's RGBW panel, each pixel consists of only two sub-pixels (RG or BW). The biggest drawback of this technology is that its resolution may be only 1920 × RGBW × 2160, the quality is not as good as RGB in-line 4K panel. However, Samsung stated that its RGBW panel conforms to VESA's definition of 4K because VESA defines a 4K panel based on the alternating number of black-speed matrices on the color filter, not the number of sub-pixels. At the same time, Samsung has also adopted GMA (gamut mapping algorithm) and SPR (subpixel rendering) technology in its GreenUHD panel in order to improve the picture quality.
About VESA
This word is accidentally seen as VISA, then what is VESA?
The Video Electronics Standards Association (VESA) is a non-profit international organization headed by a board of directors representing more than 140 member companies with voting rights from around the world. The headquarters was established in Milpitas, California and was founded in 1989. Since then, it has been working hard to formulate and promote the display of relevant standards.
By the way,
Samsung and LG's RGBW 4K panels should roughly be understood as adding a white point, replacing RGB color blocks with white points, and using algorithms and other techniques to become a similar color point, and the technology used is not the same. It seems that LG seems to be a little more honest because Samsung's one effective color pixel consists of two color dots (RGB is three), while LG is composed of two color dots consisting of five color dots, and LG is only less than the normal RGB panel. 0.5 color points, Samsung is one less, of course, this is just a simple comparison, the actual quality must also look at the backlight, the optimization of the algorithm . The quality of the two panels, in the absence of additional technology, is not comparable to the standard RGB panel in terms of color performance, because it is difficult to simulate what is 100% to the level it wants to simulate. And such 4K panel technology is not recognized as a 4K panel in the island countries.
Samsung said that its GreenUHD panel has the following advantages: (1) better light transmittance and higher aperture ratio; (2) reduced energy consumption; (3) reduced drive IC and T-Con (sequence controller) The cost; 4. Reduce the use of backlight modules; 5. Reduce TV system costs. NPDDisplaySearch Analysis This RGBW-style 4K has the following features:
The backlight module saves the cost, so the HX950 can be called
The GreenUHD panel adds substantially transparent white pixels, so it has better light transmittance and a higher aperture ratio. When the resolution is increased by 4 times from FHD to UHD, the panel transmittance decreases due to the increase in resolution. If the traditional RGB technology, UHD panel light transmittance is only 60% of FHD, which requires the use of backlight modules. However, RGBW has no such problem because it can provide better light transmittance.
What is the truth?
In fact, how do you say? High light transmittance is a must because your pixel is low. You use a white pixel to top three points of original RGB. Can the light transmittance be low?
The decrease in energy consumption is also related to the light transmittance. The energy loss of traditional UHD panels is twice that of FHD because it requires more pixels to be driven, while the lower light transmittance makes the panel require more kinetic energy to drive the backlight module. With the increase of light transmittance of RGBW panels, energy loss has also been reduced. Basically, NPD DisplaySearch's technical analysis shows that the energy consumption of the GreenUHD panel is only 10% higher than FHD.
̇ Green UHD panel reduces the cost of the driver IC and T-Con. In the conventional UHD panel, since there are many sub-pixels, it is necessary to have a sufficiently powerful driver IC and T-Con to promote the operation of the panel. However, the RGBW panel has fewer sub-pixels, so the cost of driving the IC and T-Con can be reduced.
̇ GreenUHD panel can reduce the cost of backlight module. LEDs and optical films are important elements that drive the brightness of the backlight module. With the higher light transmittance of the RGBW panel, the backlight module does not need to be too strong, so the structure of the LEDs and the optical film does not need to be complicated, so that the cost can be reduced.
In addition, Yang Jingping said: “The cost of GreenUHD TV system can also be reduced. With the reduction of LED modules and optical film used in backlight module, RGBW4K panel can also use other power components with lower cost, such as SMPS (switch mode power supply) and conversion. "With these advantages, Samsung Electronics and LG Display are actively promoting their RGBW 4K panels in China, and even their panel offers are more competitive than Taiwan and mainland Chinese panel makers' 4K panel offers.
What is the truth?
It is of course true that these things are listed, but how can we only see it saying that our own things are not good enough to speak of shortcomings? Are the pixels so low that they have no effect? This is certainly impossible.
If RGBW's 4K screen really has only merits and no drawbacks, why are the international giants not planning to use them on their top products and just want to "strengthen the Chinese market"? This is obviously due to the fact that 4K has been stired up in China and gradually began to take the blind road of price war.
Judging from the ex-factory price of the hottest 49-inch panels, the comparison of the 20,000-piece wholesale price shows that the lowest price (approximately) is roughly as follows
1.RGB 1080p China Star Optoelectronics/LG 2400RMB
2.49 inch RGBW+Half Cut 1080p China Star Optoelectronics 3100RMB;LG 3400RMB
3.RGB 4K China Star Optoelectronics 4700RMB; LG 4600RMB
What is wrong with that RGBW 4K panel? For LCDs, grayscale changes can be single-shifted in RGBW instead of RGB tri-color pixels. This feature undoubtedly reduces the dynamic response time of grayscale and weak colors. But also can enhance the details of the weak color by the color enhancement method, reduce the impact of LCD light effects. In addition, because W is not a valid color pixel, it will undoubtedly affect the performance of the panel's color purity and the details of the screen. Although this problem may be improved by the algorithm and panel optimization, but with the real RGB 4K panel In contrast, there will always be a gap in the screen performance, which is why the Dachang Top-class products will not use such cheap 4K panels.
Summary of the full text: It is clear that the "fake 4K" panel defined on the Internet is a "new product" developed for the low-end 4K market. Their lower prices and lower system costs make it easier for manufacturers to produce cheaper products. The 4K TV, but picture quality, it is clearly unable to match the RGB 4K panel. If you buy a 4K TV that is directed at the picture quality, it is necessary to buy a pre-screening screen.
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