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Before answering this question, first understand why HDR technology will appear on television at this point in time.
Why HDR TVs Are Fired This Year?
In fact, at the CES show in 2014, TV HDR technology appeared on the TV. Why use it on TV? The reason is very simple. In order to let you see the screen closer to the real world in front of the TV. Of course, all display technologies are working hard towards this goal. The development of video technology has been going through a long period of time. The resolution, depth (grayscale), frame rate, and color gamut space that affect video quality have all experienced very mature development. Stay at a relatively basic level - the era of SDR. 
Is HDR TV expensive?
Consumers are generally more sensitive to price than technical sophistication. Even if HDR TV has a very outstanding effect, if you sell it, you will certainly not buy more people. The price-performance ratio has become the concept of the subconscious level of consumers. Whether it is the level of a thousand dollars or the level of a million yuan, there is always a process of price comparison. 
Not all HDR TVs can meet HDR standards
Just as everybody always discusses genuine and fake 4K TVs in the commentary area, HDR TVs with different technical specifications will differ in effect. When manufacturers do product positioning, they will use different materials and technologies on TV depending on the price segment. This is understandable, and this is also the principle of a penny. 
Simply speaking, to reach the HDR standard, higher requirements must be met in the following areas:
Higher brightness
We know that the biggest feature of HDR TV is that it has a very high dynamic range of brightness. The brightness range that can be observed by the human eye is 10^5 cd/m2. The closer the TV peak brightness is to this value, the more pronounced the HDR effect will be. Of course, apart from some of the top TVs and monitors, ordinary TVs cannot reach this level. The latest flagship TVs in the civilian sector, such as Samsung, Sony and Sharp, can achieve peak brightness of more than 1,000 nits, which is also a considerable amount. 
Richer colors
High brightness is to achieve what effect? Is it just to look at the glare of the sun? of course not. High brightness is only one quadrant of the brightness dynamic range, and the other is a very low brightness, which can express pure black. Moreover, there is a good level of control between this very high and very low brightness, which is the basic condition for realizing the HDR technology. With this extreme brightness and darkness and level control, the colors in the extreme brightness can be expressed more clearly, such as the colorfulness in the fireworks highlights, the gorgeousness in the city nightscape, and the richer color gradation under normal brightness. . 
HDR decoder chip
In addition to HDR standards in hardware display, HDR decoding technology is also indispensable. HDR chip source covers more color and brightness information, so the decoding chip and algorithm must be more powerful. Currently, the industry uses the 10 bit HDR decoding as a reference standard, and 10 bit decoding can output 1.07 billion colors, which brings more powerful HDR decoding. power. Of course, the threshold of decoding technology is not high, and most of the latest high-end chips from Morningstar and Ruiqi support 10bit HDR decoding. 
High-end HDR television has reached the HDR standard in all aspects, so some people have to question whether there is no source. This question is the same as the questioning of 4K sources at the time of 4K TV's rise, and the questioning of VR sources. On the one hand, the film source definitely needs time to accumulate. On the other hand, even if it is an ordinary 4K film source, the real-time conversion technology of HDR can convert the SDR (normal image quality) image enhancement algorithm to HDR image quality in real time, which can also improve the final result. The display effect, this 2K to 4K technology is the same reason, but of course pure 4K HDR video to be happy.
What is the actual effect of HDR TV?
In front of a bunch of theories, they are all meant to illustrate some of the changes brought about by HDR television in display technology. However, after all, the theory still cannot be intuitively effective. Next, we will conduct a more subjective test. Considering that the current HDR film source is still relatively rare, our test is divided into three parts: the first part, the same HDR TV broadcast the same HDR source, comparing the display effect of turning on and off the HDR function; the second part, a HDR TV, an ordinary TV, compare the effect of playing HDR film sources; the third part, an HDR TV, an ordinary TV, compare the effect of playing ordinary 4K film source. All materials are screen shots in a unified environment.
Part1, HDR source, Switch HDR effect comparison 
Part2, HDR film source, HDR TV and ordinary TV effect comparison 
Part3, ordinary film source, HDR TV and ordinary TV effect comparison 
The third point should be a point that many consumers are very concerned about. After all, HDR's sources are still very limited. How much better is it to buy HDR TV broadcasts from ordinary film sources than ordinary 4K TVs? The above chart gives a good explanation. If you glance at one eye, you won't see much difference between the two screen shots. If you come to play, you will find different results. The background HDR TV performance is relatively deep, and the contrast with the main body is widened. The black, white and blue feathers of the parrot head HDR TV will be more rich in levels, and the head of the parrot is more three-dimensional, including the eyes. In the color part, the HDR TV is purer when it is green and yellow, and its red mouth is slightly brighter.
The three different combinations of contrast screen shots can more closely represent the real difference between HDR TV and ordinary TV. The results of the final test are still relatively clear, subjective feelings should be able to easily judge, HDR TV broadcast ordinary film source and ordinary TV in the picture contrast and color will be slightly better; and HDR TV when playing HDR film source Can be on the order of brightness and color better than ordinary TV.
to sum up:
Since HDR TV has become a major selling point for all manufacturers, the number of HDR TVs on the market will surely increase. From a vendor's perspective, the weak home appliance market certainly needs to create new consumer stimulus points, and HDR is undoubtedly the highlight of this year. From the consumer's point of view, whether HDR can be a pain point for consumption still requires price and actual effect.
From the perspective of price, technology, and final results, we still give HDR a positive attitude. Although low-end HDR TVs do not provide powerful backlighting and picture quality driving, at least it does not increase prices, and it can be a bit better than regular TVs of the same price when playing ordinary video sources. HDR sources are enriched, HDR The advantages will be more pronounced. High-end HDR TVs are not just born for HDR technology. They are in line with HDR's strict standards. They are also for pursuing better overall picture quality performance, and prices are not much different from the previous generation non-HDR flagship TVs.
Therefore, it is still the old saying that buying new electronic products does not buy old. If you happen to have a need to buy a TV, you might as well take HDR's ride and get your eyes accepted for a baptism.
Did you really read HDR technology? The old driver told you that HDR TV should not be bought
Remember that 4K TVs have gradually become the mainstream in previous years. Are there any 4K publicity scenes in major home appliances stores? Purchasing guides are eloquent and show a dance to show you the meticulous picture and true colors brought by 4K technology. Of course, you should also use 1080P TV to do a detailed comparison of "buying". Almost every year there will be a marketing topic, OLED, Quantum dot successors, and this year's HDR technology has clearly become the main force of the major stores. Do you feel confused as a consumer? What is HDR in the end? Is it worth buying now?
It is precisely because the SDR, a standard that has stagnated 50 years ago, has inspired a wave of technological revolution. Just like a wooden barrel missing a wooden plank, let the bucket of color space be filled with water forever. The emergence of HDR just made up for this missing link. The emergence of HDR can provide a higher brightness dynamic range for the color space.
It is precisely the second generation of quantum dot technology that has revolutionized the effects of color, the possibility of higher brightness for high-brightness backlighting, and the ability to capture HDR shooting equipment. More HDR video productions are starting to be created. HDR technology is beginning to shine at this stage. Even if it was put two years ago, many hardware conditions are immature.
HDR TV cost is not high? The mainstream brand HDR 4K TV 55 baht prices are also around 4,000 yuan, 60-65 baht are around 5,000 yuan, almost the same as ordinary 4K TV. Several Internet TV brands are also actively seeking cooperation to launch TVs with HDR technology, and may also push HDR TV prices to new lows. Of course, there is still a considerable gap in technology and effect between a few cents and a few thousand dollars for TVs that support HDR technology.
At present, there is no international organization that has issued a set of rigorous HDR television standards. However, the China Electronic Chamber of Commerce and the China Electronics Standardization Institute have issued the "HDR Display Technology Certification Specification" and issued "HDR" for the first batch of certified products. Certification mark". It is reported that most of the international standards will also be completed within the year.
To achieve ultra-high brightness, LCD TVs must be improved in backlight system technology. Of course, LCD TVs with local light control technology can do a good job of controlling the brightness level, but they still cannot break through the high-luminance ceiling. As TVs become thinner and thinner, how to provide high-density direct-type LED backlights and how to control the large heat generated by high-density LEDs have become obstacles to achieving high brightness.
At this time, TVs are required to have technologies that express richer and more realistic colors. Quantum dot technology is one of them. It is the best solution for efficiently improving the color gamut of a color TV. Quantum dot technology can change the wavelength, can show the pure white light of the red, blue and green three colors, so that the color is more pure and true. Currently, manufacturers such as Sony, Samsung, and TCL have all deployed quantum dots as key technologies.
The above mentioned HDR TVs, which are all three points, are mostly high-end models of major brands. They have better backlight technology, better picture quality technology, and so on. Most midrange models have not reached HDR's best standards in brightness and color. The kind of promotion and promotion system can support the HDR function, and certainly it only supports the HDR source in the decoding algorithm.
This section selected a high-end HDR TV to play 4K HDR source. The figure above shows the HDR function is off. The figure below shows the open state. From the screen effect, the difference is still very obvious. When the HDR function is turned on, the brightness level of the screen is more abundant, the sense of stacking and color of the sky cloud is clearly expressed, the red of the dark part of the lower right corner is more transparent, and the details such as windows are more clear. On the other hand, with the HDR effect turned off, the entire picture lacks many levels. There is no sense of space, and the overall color is bleak.
The second comparison also uses a 4K HDR source. The above figure shows the effect of HDR TV playback. From the brightness point of view, the above picture is one level higher than the brightness range of the following figure. The lantern is brighter and the detail on the lantern is also very clear. (The cause of the exposure is not very clear on the picture, but it is clearly visible to the naked eye.) The overall contrast is higher. The colors can be seen at a glance, the color of non-HDR TV is too rigid, and it has formed a strong contrast with the bright picture above. The reason for these differences is closely related to the backlight, quantum dot technology, and HDR decoding chip mentioned above.