Better display? The difference between HDR and UHD technology revealed
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Friends who are interested in display technology know that at this year's CES2016, whether it is the X93D series released by Sony, or the G6, E6 and the relatively low-positioned UH series launched by LG, HDR is the focus, and monitors equipped with HDR technology will also be popularized. HDR technology, which was still unfamiliar to everyone for a while, has quietly come to the fore. Today, let us learn about HDR display. And the development of this technology will inevitably affect our daily entertainment life. Can't tell the difference? Know HDR technology HDR (High-Dynamic Range) is translated as "high dynamic range display technology". This term was first mentioned in the field of photography. It is a technology that can enhance the dynamic range of photos, that is, the contrast between the brightest white and the darkest black. For example, the iPhone supports HDR shooting. It can take 3 photos with different exposures and synthesize them through HDR technology to obtain better photos. You can see that the photos synthesized by HDR have higher clarity and stronger layering. Before and after comparison of HDR processing effect on iPhone The HDR technology on current display devices is similar to this, except that it directly realizes the HDR effect through the display device processing unit, rather than through software post-synthesis. For example, the HDR effect on devices such as iPhone is like using Photoshop on a PC to modify pictures into photos with SLR effect. HDR TV is equivalent to a SLR camera, and the photos taken are directly SLR effect photos. Devices using HDR technology can make the screen display clear details in both highlights and shadows, which can bring us better visual effects. Behind the clearer display of Sony X93D TV supporting HDR - Exploring HDR display technology Through the above introduction, we know that display devices using HDR technology have higher-definition display effects. So what technology is behind HDR, a high-definition display? First of all, display devices that support HDR have a wider dynamic range, so that various different brightnesses can be fully presented. TVs that support HDR have a higher dynamic range than ordinary TVs . The dynamic range refers to the highest overall contrast that can be found in an image. Usually we use a ratio to express it, such as "200:1", "400:1", etc. This value depends on the overall range of brightness and the minimum brightness level. Obviously, the larger the dynamic range, the better the display contrast and color accuracy . The most intuitive feeling is that the image (or video) looks clearer, with a stronger sense of layering and richer colors. HDR display effect comparison Secondly, HDR technology can display richer information. For ordinary TVs, in order to meet the technical upper limit of the TV, the TV image processing unit will greatly reduce the amount of image information. In terms of brightness, the brightness of ordinary TVs is generally between 500 nits and 1000 nits, so the details of the highlights and dark parts of the picture cannot be displayed. A TV that supports HDR can reach 5000 nits, which is much higher than ordinary TVs. Of course, HDR is not to simply increase the brightness of the TV. The purpose of increasing the brightness is to broaden the image display range in order to better present light and shadow. In this way, we can see the details in both shadows and highlights. For example, the scene under strong light will not be so dazzling, the colors will be fuller and more realistic, the gradient of tones will be more delicate, and the details that were originally blurred in the shadows will be clearer. HDR can present a more natural and realistic image. HDR improves brightness to show better results. In short, HDR greatly improves contrast and color accuracy by improving parameters such as the dynamic range and brightness of display devices. The bright parts of the picture will become brighter, making them look more "deep", and the improvement in color accuracy will make blue, green, red and all colors in between look brighter and purer, and the color transition will be more realistic and natural. Tips: What is the difference between HDR and UHD? With the popularity of 4K display devices, we often hear the term UHD, which means ultra-high resolution. We can also understand it as 4K resolution. Its main function is to greatly increase the number of pixels, which is what we often say on PCs to increase the display resolution. 4K resolution can reach 4096x2160. The main function of HDR is to make pixels more accurate and rich. It has nothing to do with resolution. That is, whether it is on a 2K or 4K resolution display device, HDR can make them show better display effects than devices that do not support HDR. Of course, HDR and UHD can work closely together. All HDR TVs that have been announced support 4K UHD. LGEC9700 TV HDR supports UHD HDR, bringing us better visual enjoyment According to scientists, our human eyes are actually a "super camera" with up to 576 million pixels. The objects and images we see in daily life are better than those of the current top display devices. With the advancement of display technology, people's requirements for display quality are getting higher and higher, especially those who like to watch movies. For example, friends who pursue the best picture quality like to watch Blu-ray high-definition movies. Now the new 4K Blu-ray movies also list HDR as a standard technology. Obviously, the combination of 4K and HDR means that ultra-high-definition and ultra-high-dynamic images are coming, which will have clearer and more layered display effects than the current 1080p full HD. In this way, the future 4K HDR display effect can allow us to have a visual effect closer to the real effect when watching blockbusters. Blu-ray 4K HDR movies are of course ultra-high-definition, which will also bring better display effects in our daily video chats and online shopping, adding more fun to our lives. For example, when shopping online, a high-definition photo that is closer to the real thing can obviously give us a more intuitive and emotional understanding of the purchased items. However, it should be noted that it cannot be said that the display performance of HDR display devices is necessarily better than that of non-HDR devices, because in order to truly achieve ultra-high-definition display effects, in addition to HDR hardware requirements, it is also necessary to use the support of the film. For example, HDR TVs need HDR content to highlight their own value. As a winner of Toutiao's Qingyun Plan and Baijiahao's Bai+ Plan, the 2019 Baidu Digital Author of the Year, the Baijiahao's Most Popular Author in the Technology Field, the 2019 Sogou Technology and Culture Author, and the 2021 Baijiahao Quarterly Influential Creator, he has won many awards, including the 2013 Sohu Best Industry Media Person, the 2015 China New Media Entrepreneurship Competition Beijing Third Place, the 2015 Guangmang Experience Award, the 2015 China New Media Entrepreneurship Competition Finals Third Place, and the 2018 Baidu Dynamic Annual Powerful Celebrity. |
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