HDR is an abbreviation for High Dynamic Range in English "High Dynamatic Range." When HDR is used on a TV, it means that a wider range of brightness can be displayed.
In the real world, there is a very wide range of brightness: for example, the brightness of a place under direct sunlight can reach 300,000 nits, and the brightness of a place in a room where there is no sunlight can be only a few nits, and the starry sky at night is even 10%. Negative fourth to negative six times Nite. However, the range of brightness that our human eyes can perceive is much smaller, usually 1-10 nits (though it is neat that the human eye can freely adjust this range within a certain range according to light changes).
The TV screens we see, although they may feel very colorful, but still give people an unrealistic feeling, the main reason is that the brightness range of the TV can be displayed is too small, the past LCD is generally the highest brightness Hundreds of nits, not to be compared with the real brightness range of the natural world, are two orders of magnitude smaller than the brightness perception range of the human eye.
In a strict sense, HDR is only a standard of image quality, but it cannot be understood as a function or technical means. However, in order to achieve the high brightness range required for HDR, various companies have different solutions. At the recent Sony EXPO 2016 show, Sony showed off a "Blacklight" HDR implementation that was under development, but already had a prototype. "Backlight Master Drive" was quite shocking.
In fact, the 4K HDR TV X9300D that Sony has already sold this year already has a dynamic backlight system called "Slim Backlight Drive." The "Backlight Master Drive" presented to Chinese media has a totally different principle.
First of all, "Backlight Master Drive" is based on direct-lit LED backlighting. On Sony's 65-inch prototype, it can be clearly seen that a large number of LED lamp beads are arranged behind the LCD panel, although Sony did not disclose the LED lamp. The number of beads, but from the visual effect, can be roughly imagined as the array density formed when many 7 cells are arranged in a close upright position.
For LCD TVs, the use of direct-type backlights in itself means better regional light control capabilities, and the use of such dense backlights means that the accuracy of backlight control can reach an extremely astonishing level. In fact, if you remove the LCD panel, simply look at the backlight matrix in “Backlight Master Driveâ€, you can see the image effect similar to the outdoor LED large-screen ads, but the image becomes black and white (because the backlight system only changes in brightness ), quite shocking.
Secondly, “Backlight Master Drive†also has to solve the problem of interference between a large number of LED lamp beads when they are densely arranged; in the end, it also needs to solve the problem of heat dissipation of so many LED lamp beads. The good news is that these problems have basically been solved.
As for the power consumption issue that many people are concerned about, Sony said that even if it uses so many backlight LED lamp beads, but because there are usually many dark parts in the video screen, the backlight drive circuit will control each LED in real time according to changes in screen brightness and darkness. The brightness, the total power consumption will still remain at the same level as ordinary liquid crystals of the same size.
How powerful can this HDTV with this black technology be? At present, most HDR TVs with a maximum brightness of 1,000 nits on the market have been considered to be very good products. With the use of the “Backlight Master Driveâ€, the TV can reach a brightness of up to 4000 nits. This is the most intuitive data change.
However, it is very regrettable that Sony did not allow the media to capture the contrast of the display for commercial confidentiality (because it included a WRGB OLED TV for effect comparison), but compared with the edge of its own new product X9300D Both have a “one-eye†gap in the range of brightness and even the expressiveness of the entire color reproduction; compared with Sony’s own 300,000-Yuan professional broadcast-grade RGB OLED monitor, the overall image quality is very, very Close to. That said, it may be confusing for people who originally planned to buy the X9300D, but this is indeed the case, because you can also continue to wait for the adoption of this technology. But when do you want to know when? This kind of problem is natural to Sony will not tell you, there is an unofficial channel of information you can refer to: This year is a bit difficult, but the three-year period is certainly too long. So wait and wait, you have the final say.
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