UHD ultra-high definition resolution is the biggest hot spot in the flat-panel TV industry in 2014. As the price of 4K LCD TVs gradually declines, consumers are now more willing to purchase 4K TV products. Compared with the traditional 1080p Full HD TV, 4K TV achieves four times the resolution in the former, so it can present more detailed picture details, and ordinary users can clearly see the difference between the two. However, the previously listed 4K TVs are mainly based on joint venture brands. The screen size of TVs is basically above 65 inches, and the price is basically above 30,000 yuan. However, with the promotion of the domestic LCD panel factory and home appliance manufacturers, the price has become more close to the people.
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The reason why the joint venture brand manufacturers mainly push the 65-inch large-size 4K TV is mainly because the tablet PC is different from the mobile phone and tablet computer. The consumer usually has a distance between the display screen and the display screen, so it is impossible to watch it at close range, so it is 55 inches. The above 4K UHD will be more obvious than the 1080p Full HD. In order to improve the quality of the image and gain greater profits, they also focus on the big screen market. According to the "Displaysearch Quarterly Global TV Shipment and Forecast Report" research report, as of 2017, 4K ultra-high-definition panels will account for 93% of LCD TVs of 50 inches and above, which is in line with the previous 1080p full HD panel occupation of the LCD TV market. The situation is very similar. It can be seen that LCD panel manufacturers and home appliance manufacturers will continue to spread the strategy from high-end to low-end.
In order to increase market share, domestic LCD panel manufacturers and home appliance manufacturers began to focus on the market below 50 inches. Due to the large drop in screen size and relatively low manufacturing costs, domestic brands have introduced many prices that are very attractive. Small screen 4K TV products, the price is even comparable to the same size 1080p TV, which is more likely to be favored by consumers. For the joint venture brand, although they can maintain a good profit by sticking to the large-screen 4K market of 55 inches or more, they will not sit idly by the domestic manufacturers in the low-end market. Therefore, the two Korean panel makers Samsung Both Display and LG Display have recently introduced low-priced LCD panels for the economical market. The biggest feature is the "RGBW" technology, which has relatively low price and low power consumption.
Korean LCD panel factory improved the existing technology
Thanks to lower prices and a relatively complete product line, domestic brand 4K TV shipments are leading the world, while the average sales price of 4K TVs in China is nearly 72% lower than other regions. In order to reduce the cost of 4K panels, Korean panel makers have developed a new specification panel, Samsung Display called it "Green UHD", and LG Display named it "G+ UHD", then as a group with Innolux and Huaxing Optoelectronics And the important weapons of AUO and other manufacturers, the new panel of the Korean panel factory is different from the traditional LCD panel, what are their characteristics and advantages?
RGBW LCD panel secret
Whether it is the "Green UHD" from Samsung Display or the "G+ UHD" from LG Display, their common feature is to use four sub-pixels of red, green, blue and white (RGBW), but in the traditional LCD panel. A complete pixel is usually composed of only three sub-pixels of red, green, and blue (ie, RRGB). However, each pixel of Samsung Display Green UHD is represented by two sub-pixels of RG or RW, while the LG Display G+ UHD panel represents one pixel by four sub-pixels of RGBW. Therefore, from the perspective of the structure of each pixel, the new panel introduced by Samsung Display and LG Display is different from the traditional LCD panel, and it is similar to the "four-color technology" that Sharp introduced before. The only difference is that Sharp joined. It is a yellow sub-pixel, while Samsung and LG are adding white pixels, but the two are significantly different from the traditional 1080p Full HD, 4K UHD Ultra HD panel, and then we will explain in detail through a table.
Comparison of the number of sub-pixels of various types of liquid crystal panels
As shown in the above figure, for the traditional RGB LCD panel, the total number of sub-pixels of the 1080p Full HD resolution LCD panel is 6.2M, while the total number of sub-pixels of the 4K UHD Ultra HD LCD panel is 24.9M, which is 4 times that of the former. . In the new RGBW LCD panel, since the Green UHD panel of Samsung Display consists of two sub-pixels of RB or GW, the resolution will be affected, which is 1920×2160, but due to the total number of sub-pixels. More, 2.7 times the traditional 1080p Full HD panel, but less than 4K UHD. However, Samsung said that according to the international standard defined by VESA, the 4K panel is based on the alternating number of black speed matrices on the color filter, rather than the number of sub-pixels, so Green UHD still conforms to VESA's definition of 4K. In addition, Samsung Display also uses GMA (gamut mapping algorithm) and SPR (sub-pixel rendering) technology in the Green UHD panel to further enhance its actual clarity.
Increase overall clarity by adding more sub-pixels to the LCD panel
Relatively speaking, LG Display's G+ UHD LCD panel has more sub-pixels, although its physical resolution is 2880×2160, which is slightly lower than the traditional 4K UHD panel, but it is completely different from the latter in terms of the number of sub-pixels. Consistently, this means that the G+ UHD panel does not perform poorly in terms of actual clarity, but in addition to having higher brightness and lower power consumption, the cost is lower, which ensures greater ownership. Market competitiveness. It can be said that in theory, the RGBW LCD panels introduced by the two Korean panel makers are far better than the traditional 1080p in terms of definition, but slightly worse than the 4K UHD panel, but relatively speaking, LG Display's G+ UHD The performance is relatively good, and the actual performance of the 4K UHD panel is very close.
Advantages of RGBW LCD panel
In terms of official publicity, the LCD panels introduced by the two Korean panel makers are all positioned as economic users, so they mainly perform well in energy saving and cost reduction. Samsung Display also introduced some of the advantages and features of its Green UHD LCD panel. First, the Green UHD LCD panel adopts the latest manufacturing process, so it has higher aperture ratio and higher transmittance, and secondly it reduces energy loss and reduces the cost of IC driver circuit and T-Con (timing controller). The use of LED backlight particles to reduce TV costs and achieve lower power consumption.
When the resolution of the traditional LCD panel is increased by 4 times from 1080p Full HD to 4K UHD Ultra HD, the transmittance of the LCD panel is reduced due to the increase in the number of pixels and the resolution (the transmittance of the 4K UHD panel is only 60% of 1080p). ), this requires LCD panel manufacturers to force the increase in the number of backlight modules, which increases the overall cost and power consumption. The RGBW liquid crystal panel has white sub-pixels, so when using the same power backlight module, it can increase the brightness of the screen, that is, if the same brightness is to be output, the power consumption of the RGBW liquid crystal panel will be lower, so that simultaneously Energy saving and cost reduction. According to data provided by Samsung Display, the energy loss of the Green HD LCD panel is only 10% higher than that of the 1080p panel. Therefore, the new RGBW LCD panel is better in terms of luminous efficiency and optimization of the backlight.
RGBW LCD panel can enhance the overall brightness of the TV
LEDs and optical films are important elements in determining the brightness of backlight modules. RGBW panels have high light transmittance, so backlight modules do not require too much power, and the structure of LEDs and optical films does not need to be complicated. Can help reduce costs.
In addition, in the optimization of IC driver circuit and T-Con (timing controller), RGBW LCD panel also has the advantage: for the traditional 4K UHD LCD panel, due to its higher physical resolution, its control circuit original needs More power and higher power consumption, while RGBW's physical resolution is less than 4K UHD, so their circuit components require less power.
In high-end OLED TVs, LG also uses RGBW technology to increase brightness and reduce power consumption.
According to the characteristics of the RGBW liquid crystal panel, it can reduce the overall power consumption of the liquid crystal panel and the liquid crystal television through various technical means, and can be used in the manufacture of the liquid crystal panel, the use of the backlight module, and the use of the original IC driving circuit. To save costs, this can fully meet the market positioning of "economical products."
RGBW panel also needs market test
From the current point of view, the two major Korean LCD panel manufacturers Samsung Display and LG Display are actively promoting their RGBW LCD panels, taking energy saving and low cost as their main advantages, and attracting major manufacturers through attractive prices. Note that this price is even more competitive than the 4K panel quotes of my brother Taiwan and mainland China panel makers.
According to relevant sources, the RGBW panel launched by the Korean LCD panel factory has attracted the attention of some domestic brand TV manufacturers, including Skyworth, Konka and Changhong, etc., which are intended to adopt RGBW Green or G+ UHD panels, and these two types of LCD The panel will begin mass production in the second quarter of this year. If the market performs well, I believe more home appliance manufacturers will follow up to purchase this type of LCD panel.
Traditional 4K UHD LCD panels still have advantages in terms of physical resolution
After the above introduction, I believe that many readers will have the doubt that the RGBW LCD panel achieves an approximate level with the traditional 4K UHD in terms of total sub-pixels by adding sub-pixels, but after all, its physical resolution The rate still does not reach the level of the latter. Is there any suspicion of “cutting the work� In fact, the strategy of the two Korean panel makers is to still use the traditional 4K UHD LCD panel in the high-end market, but The main purpose of the RGBW Green or G+ UHD panel is to make the price of the LCD TV more intimate, and at the same time improve the overall performance (RGBW has a significant improvement in definition than 1080p), the introduction of RGBW panel is beneficial to reduce costs, but Consumers also need to weigh the display performance, although its performance is not as good as the traditional 4K UHD panel, but the price is also cheaper, so it is not suitable to say that "cutting the work".
The competition in the Chinese LCD panel market will become more intense in the future.
However, for the entire market, the Korean panel factory's move will have a greater impact on the domestic LCD TV market. With the advantage of color technology, the domestic panel makers will compete by lowering the price of the LCD panel. The advantages of the panel factory were further weakened, but it was slightly superior in terms of clarity. Enterprises equipped with this type of LCD panel are not limited to joint-venture brand manufacturers. Domestic brands including Changhong and Konka will also be used. This will make the competition between Chinese LCD panel factories more intense and may trigger new price wars. Since the current RGBW LCD panel has not yet officially met with consumers, it still needs to be tested by the market. The prospect of RGBW is ultimately determined by the actual experience of consumers.
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