The future of LCD TVs explains high dynamic range display technology

At CES2014, Panasonic announced a sad news: Plasma TVs with a fever-friendly rating will be phased out, replacing it with cheap, technologically mature LCD technology. Panasonic comforted that after the new technology, the quality of the LCD panel is comparable to the old plasma panel, and the key word is "dynamic range." Let's see what is going on. The term "dynamic range" can be used to describe a digital image. It is also an important parameter for describing the performance of a camera's light-sensing components and the display performance of a display device such as a television. When describing the latter two, he describes the extent to which the device can represent the darkest to brightest part of the picture. In the field of display devices, contrast is also used more often to measure the dynamic range. Here, we first explain the concept of contrast, which is an important indicator that can quantify the dynamic range of the display device. It expresses the ratio of the brightest and darkest brightness of the screen. For example, the brightness of a white field of a TV can reach 100 ftL (foot-Lamber, brightness unit), and the brightness of the dark field is 0.01 ftL. We say that the contrast or dynamic range of this TV is 10000:1; A TV with the brightest and darkest brightness of 50 ftL and 0.05 ftL is 1000:1. Generally speaking, the LCD LCD TV has a dynamic range of 2000 to 4000, and the plasma is about 2 to 3 times that of the LCD. The OLED parameters in this respect are ideal because the OLED panel can almost reach no light when displaying black. The degree, that is, the minimum brightness that can be displayed is very low. The high dynamic range technology of the display device helps to improve the picture quality, and the difference is visually obvious. At this year's CES show, many TV equipment manufacturers showed their own high dynamic range technology. This kind of technology is another hot topic discussed by many manufacturers except 4K, curved screen and OLED, like Dolby. Lab, Sony, Samsung, etc. Dolby Video High Dynamics Expands the contrast or dynamic range of your TV to create a more realistic picture. In general, a display device with a small contrast has insufficient screen impact, and the overall picture is relatively flat, while a high-contrast screen can show the level and realism on the paper. The comparison of the following pictures, although due to the camera device, makes its expressiveness look less powerful than what is actually seen in the picture, but it also shows the difference in image quality between different dynamic range screens: One of the more striking features of dynamic HDR technology is Dolby Vision (Dolby Video High Dynamics). In fact, Dolby Vision is not only a TV technology, it also enhances the dynamic range of the signal. Combining the common technology optimization of both TV and signal, Dolby Vision eventually produces more realistic images and images. Dolby Laboratories has specially shown a slide on the human eye, as well as the dynamic range of today's movies and TVs, for reference. Dolby Laboratories has demonstrated its prototype equipment using Dolby Vision technology, but the cost of this equipment is not possible in the general appliance store. But partners involved in this highly dynamic technology include Sharp, TCL, Vizio and other vendors. Sharp demonstrated the ultra-high-definition TV products using Dolby Vision technology at CES, as shown below. Still because of the camera, the TV with this technology on the left is slightly over-exposed on the screen, but the actual situation is that the screen on the left screen is brighter and more impactful, and there is no problem of high light overflow. Many of the films in the film "Star Trek Into Darkness" directed by JJ Abrams require high-contrast display devices. On the TV shown on Sharp, this part of the picture is obviously much more expressive than traditional TV. The picture details are richer and the visual experience is naturally better. In addition, the Reference Series TV series shown at Vizio's booth is the first TV product to officially adopt Dolby technology according to Vizio, with 65-inch and 120-inch versions respectively. They also use full-array local dimming technology, which is similar to the TV shown in the Sharp booth and has a high contrast ratio. Other HDR high dynamic range technology, Dolby Vision, is just one of the HDR technologies. Although it does play a very positive role in the overall system, this technology produces a very good image for a particular HDR-encoded movie. . Some content providers are specializing in the production of such imagery, but after all, they are only a small number of video content. So other TV manufacturers are pushing their own HDR technology, which works for any content. The essence is largely full array local dimming. After years of development of this technology, manufacturers can keep the brightness of the TV screen brighter while keeping the brightness of the other parts of the screen unchanged, and minimize the effects of blooming and halo. Samsung showed a TV with HDR technology at CES, but Samsung's HDR technology has no name yet. The product on the left side of the above picture is the Samsung UN85S9, and the right side is the improved version 85S9 with HDR technology. In the demonstration of pure white screen, the staff on the scene said that the brightness of the two TVs is 300 nits, but the modified version of the 85S9 on the right is obviously brighter on the look and feel; when the two colors are crossed, the white part is not Excessive high light overflow. The demo image above shows that the highlights of the image are brighter, but the details of the shadows maintain similar brightness. Sony's booth demonstrated its HDR technology called X-tended Dynamic Range Pro, and there are special charts to explain this technique. However, the products used for the live demonstration of the X950B series do not seem to be as effective as Samsung's 85S9, and there is a visible highlight overflow in the picture. The foreign media reporters who visited the CES exhibition asked the Sony staff on the issue. The staff said they were still adjusting the technology. Considering that the X950B series is cheaper than the Samsung 85S9, and its overall effect is good, it is generally worth the price. Today, plasma TVs are almost dead, OLEDs are still new and extremely expensive. HDR high dynamic range technology is an effective way to improve picture contrast and improve picture quality and market competitiveness of LCD liquid crystal display devices. In the future, will TV products with Dolby Vision technology appear soon in the market, whether there will be more LCD TVs using local dimming technology, and whether HDR will quickly occupy the market, we will all look forward to this.

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