In the name of the flagship TV: What does it mean to verify the low-end HDR TV?
Why do all manufacturers prefer this technology?
Many consumers choose HDR for better picture quality. First of all, we must admit that HD technology R, as the only popular quality technology for all brands, can really improve the quality of TV. Simply put, it can enhance the contrast and color range of the screen display. The bright part of the screen will be more clear, the dark part will be more in depth, the layer will look more distinct, and the increase in color accuracy will make the color look more pure and bright. .
Two mainstream HDR video formats
The reason why TV manufacturers have followed up HDR technology strongly is that HDR can really bring about a significant improvement in picture quality. With the development of HDR technology, if HDR-free TV is not available, the future will be unable to resolve and watch HDR films. Source; The second point is very simple - this technology is free (single refers to HDR-10), not to mention money, but also to pick up the bike. Add it first.
Almost all television products on the market are labeled with HDR
Following smart, 4K, high-contrast, and wide color gamut, TV manufacturers are eager to find new technology selling points to stimulate market cheers, and at this time HDR technology has been logically pushed out. Today, HDR technology can be effectively applied to Blu-ray discs, high-definition resources, and PS4/XBOX ONX game consoles, provided HDR technology on the TV is sufficiently effective. If we don’t talk much, we will go directly to the comparison, and then we will demonstrate it based on the test results.
No harm without comparison allows you to see how deep the HDR water is
Some low-cost mid- to low-end TV products on the market have only added one HDR decoder chip. The improvement of TV display performance is almost zero, and even the picture quality becomes even worse. In order to visualize it, I got two TVs to play the same HDR source at the same time. One of them is a mainstream 55-inch TV set with a price of 6,000 yuan, and the other is a high-end 65-inch flagship model with a price of 30,000 yuan. You see how deep the water is.
After we tested the actual objective of the two TVs, the brightness of the left TV is 305nits and the color gamut is 72.3%; the brightness of the high-end model on the right is measured as 1135nits and the color gamut is 101%. Then the two data are How much impact does HDR have on presentation? Please see below
Mainstream 55-inch HDR TV on the left side (screen display is already in HDR mode, contrast is fair)
Before the comparison, the author restored the quality display of the two TVs to the factory state and played the same HDR source at the same time in a dark field environment. From the above comparison chart, the mainstream price TV on the left can identify and play the HDR source. The most intuitive difference in this picture is the brightness. The flame on the right side is extremely bright and true, while the left side seems to be covered with a layer of black yarn. The brightness is far from HDR quality standards.
Low-end TV can't show HDR's picture quality at all
The overall color of the left screen is yellowish and dark
No need to play "find different" This is obviously a "not" video
The above three real shots, the left side of the TV due to the brightness range is far less than the HDR video standards required, the shadow details are almost all disappeared, no sense of depth and depth of view, I suspect that they are wearing sunglasses to watch. The right-side picture is brighter, the details are clearer, and the level of expression is more distinct. The visual effect is that the scene in the picture is ready to appear, and the light and shadow are close to the truth.
The difference in actual viewing is even more apparent than in the figure
HDR effect of high-end TV is improved significantly, bright and transparent
Did you think that the left TV has added "Night Shift" function?
In contrast, the difference in color performance is also intuitive and sensible. Here we can see that the TV on the left is not only a matter of low brightness, but the overall color is yellow and gray, giving people the feeling that this TV is enabled with Night Shift night vision mode? The blue, green, and red colors on the right-hand side of the TV look brighter and purer, and the color transitions closer to reality.
Why do you say that many TVs are under the banner of the HDR?
HDR technology is not as simple as everyone thinks, nor is it just that any TV can play an HDR role. Why did the author decide that many televisions are under the banner of HDR? The test result is already very obvious. Why does it mean that only high-end TV can have HDR high quality? We must know what the criteria for achieving HDR are.
HDR requires television to have higher blessing in brightness performance
brightness
Just talking about brightness, more than half of the TVs in the market can basically saygoodbye. HDR itself is a technology that will increase the dynamic range, can make the brightness level in the picture clearer, widen the brightness range to show more picture details, which requires the TV to have higher brightness/contrast. For LCD TVs, the HDR display brightness range is a minimum standard of 0.05 to 800 nits, but the brightness levels of mainstream TVs in the market are concentrated around 500 nits, which is far below this level.
HDR needs TV to show more color
color
When the brightness reaches a peak, the color you want to display gets a better performance. At this time, the TV needs to have a higher color gamut. The emergence of wide color gamut technology can effectively compensate for the lack of television color display. However, the mere “stacking†of the color gamut without precise control of color will outweigh the benefit. The result is a distorted picture. Therefore, manufacturers’ adjustment of their own TV picture quality is also crucial.
At the same time, I have to stress that, like 4K video, a dedicated HDR camera is required for video capture. The HDR format video on the market can be very few, only a few 4K HDR Blu-ray discs can support it. In some TV platforms, it is hard to say whether 4K is the source of HDR films, let alone whether it can truly meet the standards of HDR film sources.
High-end TVs turn off HDR mode even better than some low-end TVs.
Written at the end:
The result of the comparison is shocking and exciting. What was shocking was that before the test, I did not realize that the difference in the performance of the two TVs in the HDR source was so great. The excitement is that the author has finally been able to comfortably tell the consumers that the HDR technology is still a long way from most of us. At least for now, you don't have to bother.
Finally, the author wanted to say that no one wants to use the SDR standard even 50 years ago. HDR this technology can really improve the picture quality performance, but is currently limited to high-end flagship TV models, its HDR display is indeed amazing. Unfortunately, mainstream HDR TVs with amazing sales volume, so-called HDR technology, are not of much significance. It turns out that HDR technology is very good, but the starting point is also high. I hope this article can play a certain role in helping readers to properly purchase TV.
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The ordinary achromatic lens refers to a lens group that corrects the chromatic aberration of light of three wavelengths (blue, green, and red).
Because the blue image of the light condensed by the converging lens has a close focus, and the concave lens has a high divergence rate for the blue light, the chromatic aberration of the two mirrors is opposite to each other, so that the red and blue images can be superimposed into one, basically eliminating chromatic aberration.
The shape is a crescent shape (concave and convex), which is cemented by two lenses with different refractive indexes and dispersion rates. After that, a multilayer bonded achromatic lens appears.
The achromatic lens can not only achromatize, but also aspherical aberration by appropriately changing the radius of curvature of each surface. If the two glasses that make up the doublet lens can be selected arbitrarily, it can also eliminate coma.
There are also three or four shades of chromatic aberration correction, at this time the residual chromatic aberration is smaller, but due to difficulties in design and manufacturing, such achromatic lenses are only used in some special occasions. Achromatic lenses are widely used, and a multi-lens optical system is often composed of multiple achromatic lenses. High-quality microscope objectives, photographic lenses, etc. are all complex lens combination systems that both achromatize and eliminate various other monochromatic aberrations.
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