Can HDR really improve the picture quality? How do you listen to TV experts?

The replacement of the TV set was very fast. Just after spending money on a new TV, another class of more advanced ones appeared. The beginning was 3D, and later 4K, interspersed with OLEDs and quantum dots, then cheap 4K and OLED. Today is no exception. The emergence of a new technology allows consumers to make it happen. It is "HDR", the so-called "high dynamic range."

Image from Burkeley, a sub-brand of NVC Group.

First, what kind of black technology is HDR?
HDR stands for High Dynamic Range, which translates to high dynamic range and refers to the ability to accommodate both highlight and shadow details. Its most widely used application is in the field of photography. When you take a picture, you will find that although the human eye can see it, the face in the lens will be black under the backlight, and the background of the sky and bright light will turn into a piece. This is Camera device latitude / lack of dynamic range performance.
HDR in the TV field and HDR in the photographing field have similar results, but the ultimate effect is to increase the “depth” of the light and shade of the image and make the color more prominent and closer to the naked eye. The core idea of ​​HDR is to let the audience see more things, no matter what the details are in the shadows or highlights, they will show up without reservation, and the gradient of the hue will also be more delicate.

Second, what are the advantages of HDR TV?
We can understand what "bright" means on HDR TV. For example, if there is a sun or explosion on the screen, the screen will be bright so you can't open your eyes. It should be noted that the backlight system of HDR TV panels may exceed 1000 nits (LCD HDTV is generally 300 or 400 nis). Why is it so bright? At such high brightness, the contrast between bright and dark in the scene becomes more apparent.
In addition, most HDR televisions do not use OLEDs but LCD panels because LCD panels can be brighter than OLEDs. However, because the OLED panels do not have a backlight system, the black they present will be darker.
What is the color of HDR TV? Is it better? The answer is obviously yes, HDR TV can show more colors than high-end 4K TVs. This is because the color space and color depth of HDR TV and HDR TV content are far better than traditional HDTV.

Third, the real "4K HDR" TV should reach what standard?
In recent years, new TVs have basically reached true 4K resolution and HDMI 2.0 or higher. What about true and false HDR? I am afraid we have to pay attention to these five indicators: color depth, color gamut, brightness, contrast, HDR support standards.
Color depth
Need to be able to achieve "10 bit" (ten digits), 1.07 billion color standards; 8 bit (eight), 16.77 million kinds of previous generation products are not qualified. The higher the bit value, the richer the color information.
2. Color gamut
In theory, the Rec.BT.2020 standard must be met. Even if it is not reached, it should be as close as possible. Regarding color gamut, it has a variety of calibers. Rec.BT.2020 is the highest standard, covering 75.8% of the CIE 1931 color space. The previous generation standard was BT.709.

3. Brightness
HDR requires a screen brightness of 1000 to 10,000 nits. That is, brightness less than 1000 nits does not meet the HDR standard. The previous generation SDR television standard was 100 to 300 nits, which means that only higher than 300 nits was considered higher than the SDR standard. In addition, there is also a brightness unit "Cantera / square meter", which is equal to the relationship between Nite, namely: 1nit (nit) = 1cd/m2 (Cantera / square meter).
4. Contrast
The instantaneous contrast range that the human eye can feel can reach 10000:1, and the brightness of the current consumer-grade liquid crystal display is generally about 300 to 400 nit, and its brightness range is generally 2000:1. It can be seen that the brightness of human eyes is much higher than the current mainstream display devices. So usually, the greater the LCD TV's contrast, the better.

5.HDR support standard
The two most popular standards now are the free HDR10 and the paid Dolby Vision.
HDR10 is a mandatory standard for UHD; PS4 and X1 are also used, so it currently has the highest share in the consumer optical disc carrier market; Dolby Vision supports 12-bit color depth and dynamic conversion, theoretically higher standards and better results, but may be It is the charge that limits its development. Dolby Vision has a larger presence in the online streaming media market.
As for the other HDR10+, HLG, etc., which are either just concepts or have a small proportion, they need not be considered for the time being. If you choose TV, if not bad, personal advice is to choose a model that supports both HDR10 and Dolby Vision HDR. As for the projector users, it can only be regretted that there is no projector that supports Dolby Vision HDR yet.

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