We all know that Sony's display technology has always been in the leading position in the industry. From the beginning of the 30-year legendary story of Trinitron in the era of CRT TV, Guixiang, Bravia and other brands have always been the shining stars of the TV market. The forward-looking exploration of OLEDs and the near-paranoid excavation of LCD TVs have made this technology-driven company unstoppable on the road to technology.
This year, Sony also brought backlight technology called Backlight Master Drive to the TV consumer market. With the support of HDR movies, Sony's 4K HDR TV has deeply excavated the strong potential of LCD technology.
HDR, breakthrough color space bottleneck
Before introducing the Backlight Master Drive, make a simple review of HDR. The video quality is basically divided into five important elements: resolution, color depth (grayscale), frame rate, and gamut space. These four items are already very mature. From 2K to 4K or even 8K, from 8 bits to 10 bits or even 12 bits, from the original SRGB to the DCI of the movie and to the current latest BT.2020 range, the number of frames from the original 24 to 60I to 60P, even The future 120P. These elements have developed very quickly and have reached a very high level.
There is also an element brightness dynamic range. You may not know much about it because the standard is still the SDR standard that was set 50 years ago. It has stagnated for 50 years. It is like a wooden barrel missing a wooden plank. Let the color space be a barrel and never be filled with water. The emergence of HDR just made up for this missing link. The emergence of HDR can give us a higher brightness dynamic range.
The brightness of the real world is very wide, ranging from the 10th to the 9th power of the highest normal sunlight to the very slight brightness of the starlight. The human eye system can basically capture the 10th power range in the large dynamic range. Although the human eye can't see the entire range, in fact, the human eye has certain adaptability. The human eye can make adjustments by zooming in and out of the pupil, which allows us to see a greater brightness dynamic range. The 5th power of 10 may become a reference standard.
In fact, there are already some high-end cameras, such as Sony's F55, F65 products have been able to record the 10th of the 5th power dynamic range of the brightness. Some high-end or partial display devices, such as Sony's TVs and Sony's monitors, can also perform 10th brightness dynamic range reduction. However, there is still a bottleneck. During the recording and transmission of video formats, the standard of SDR 50 years ago is still used. The maximum number of bits that can carry only 10 times is 10 times. The new HDR format just compensates for this defect, which can record the 10th power dynamic range of 5th. Satisfy the human vision system's need for ambient light perception.
Of course, HDR brings more than just the dynamic range of brightness, but also brings more colors. On the left of the figure above is the gamut of the previous BT.709 and the gamut plane geometry of BT.2020. The concept of three-dimensional color space can better reflect the true color performance. On the right side of the figure is the range of the color gamut, and the vertical axis is the luminance dynamic range. When our brightness dynamic range is combined with our colors, a three-dimensional color space is formed. This three-dimensional color space means how much color the video format can bring.
Backlight Master Drive makes super bright light possible
The standard of HDR is there, but where can we better support its hardware? Of course, there are also localized light control technology LCDs, which allow ordinary LCDs to achieve good brightness level control for shadow scenes, so as to maintain the original color while having excellent white balance. But unfortunately, its brightness still does not reach the 5th power range required for HDR video, and it is also impossible to make full-pixel comparisons. Therefore, the improvement of the backlight system technology is very necessary, and Sony brought a new set of backlight technology, Backlight Master Drive, Chinese name "dynamic backlight system master version", it is the most advanced backlight enhancement technology, is also very Precision backlight enhancement technology.
Backlight Master Drive backlight system has several characteristics, first of all it uses a new optical design, which effectively controls the overflow of adjacent LED lights.
The second point is that it has been improved on the LED backlight, using the ultra-high brightness light source used in the automotive field, can greatly enhance the brightness of the backlight. However, there are thousands of LED lamps behind the crystal TV. How to effectively control these lamps is a very important issue. So Sony has adopted a new management system that can accurately control a large number of LDE lamps.
The third point is that it is a high-density direct-type LED backlight. The real problem it brings is heat, but Sony does not use a special cooling system. Compared to other brands of liquid-cooled systems, or semiconductor cooling technology, Sony's product equipped with this technology is a normal TV design, not an industrial display.
The fourth point of a large number of LED lights will also bring a problem of energy consumption, but Sony has advanced driving algorithms that can be very good balance of energy consumption, in terms of Sony's 85-inch prototype, in the case of ultra-high brightness Maintain the same level of power consumption as an ordinary 85-inch TV.
Superior light control, more accurate and detailed use of good light source
Unique optical design, ultra high brightness LED, high density direct type LED, but no cooling system, while maintaining power consumption with precise backlight algorithm. The picture reflected by the traditional backlight technology, the vertical axis is the brightness level, the brightness is basically constant, so in any scenario is the same power consumption. The Sony TV can accurately analyze the picture, find dark scenes, bright scenes, brightly enhance the bright scenes, and control the dark scenes locally. The energy of the local light control area is transferred to the bright part, so that the energy consumption can be well controlled. This is a very unique and sophisticated light control technology.
Elite optical control technology has been placed on Sony TV two years ago and is a very good help for this Backlight Master Drive technology. Traditional direct-backlight backlights have relatively few backlight partitions, and each partition is relatively large, so that the highest brightness can not be achieved more accurately. With the Backlight Master Drive system, the partitions become more refined, and more energy saved can be used to improve the brightness of the screen. This can restore a very good picture while maintaining energy consumption.
The human eye system will have some phenomena of diffusion and stray light, and there is also a limit to the light source's recognition ability. For example, we see a light source at a point on a plane and a light source at a small spot. It scatters back into a piece in our eyes to get an almost uniform perception. Therefore, according to the principle of renewal, we can research and find a reasonable number of partitions and sizes. In this way, a certain number of LED backlight distributions can be used to create an effect that meets the perception of the light source by human eyes.
Several important parameters of Backlight Master Drive:
First: maximum brightness. Backlight Master Drive can reach a maximum brightness of 4000 nits or cd/m2.
Second: global and local contrast, the human eye's perception is close to RGB Led.
Summary: Many people will say that OLED is not the future development of technology? Is it a direction for the future? Actually not. Why do you say that? Because RGB Led can't do that much. Why have you been stressing RGB Led? Because RGB Led is the best effect. What everybody sees on the market now is the white light OLED backlight OLED TV, its technical principle is totally different, it can't show the complete color space. Sony's performance improvement on the LCD, through the new Backlight Master Drive technology allows us to obtain large size on the LCD TV at the same time, as well as the reduction of contrast effect or color display effect near the OLED, which can be achieved on the LCD. Therefore, LCD should still be a mainstream trend in the next few years.
This year, Sony also brought backlight technology called Backlight Master Drive to the TV consumer market. With the support of HDR movies, Sony's 4K HDR TV has deeply excavated the strong potential of LCD technology.
HDR, breakthrough color space bottleneck
Before introducing the Backlight Master Drive, make a simple review of HDR. The video quality is basically divided into five important elements: resolution, color depth (grayscale), frame rate, and gamut space. These four items are already very mature. From 2K to 4K or even 8K, from 8 bits to 10 bits or even 12 bits, from the original SRGB to the DCI of the movie and to the current latest BT.2020 range, the number of frames from the original 24 to 60I to 60P, even The future 120P. These elements have developed very quickly and have reached a very high level.
There is also an element brightness dynamic range. You may not know much about it because the standard is still the SDR standard that was set 50 years ago. It has stagnated for 50 years. It is like a wooden barrel missing a wooden plank. Let the color space be a barrel and never be filled with water. The emergence of HDR just made up for this missing link. The emergence of HDR can give us a higher brightness dynamic range.
The brightness of the real world is very wide, ranging from the 10th to the 9th power of the highest normal sunlight to the very slight brightness of the starlight. The human eye system can basically capture the 10th power range in the large dynamic range. Although the human eye can't see the entire range, in fact, the human eye has certain adaptability. The human eye can make adjustments by zooming in and out of the pupil, which allows us to see a greater brightness dynamic range. The 5th power of 10 may become a reference standard.
In fact, there are already some high-end cameras, such as Sony's F55, F65 products have been able to record the 10th of the 5th power dynamic range of the brightness. Some high-end or partial display devices, such as Sony's TVs and Sony's monitors, can also perform 10th brightness dynamic range reduction. However, there is still a bottleneck. During the recording and transmission of video formats, the standard of SDR 50 years ago is still used. The maximum number of bits that can carry only 10 times is 10 times. The new HDR format just compensates for this defect, which can record the 10th power dynamic range of 5th. Satisfy the human vision system's need for ambient light perception.
Of course, HDR brings more than just the dynamic range of brightness, but also brings more colors. On the left of the figure above is the gamut of the previous BT.709 and the gamut plane geometry of BT.2020. The concept of three-dimensional color space can better reflect the true color performance. On the right side of the figure is the range of the color gamut, and the vertical axis is the luminance dynamic range. When our brightness dynamic range is combined with our colors, a three-dimensional color space is formed. This three-dimensional color space means how much color the video format can bring.
Backlight Master Drive makes super bright light possible
The standard of HDR is there, but where can we better support its hardware? Of course, there are also localized light control technology LCDs, which allow ordinary LCDs to achieve good brightness level control for shadow scenes, so as to maintain the original color while having excellent white balance. But unfortunately, its brightness still does not reach the 5th power range required for HDR video, and it is also impossible to make full-pixel comparisons. Therefore, the improvement of the backlight system technology is very necessary, and Sony brought a new set of backlight technology, Backlight Master Drive, Chinese name "dynamic backlight system master version", it is the most advanced backlight enhancement technology, is also very Precision backlight enhancement technology.
Backlight Master Drive backlight system has several characteristics, first of all it uses a new optical design, which effectively controls the overflow of adjacent LED lights.
The second point is that it has been improved on the LED backlight, using the ultra-high brightness light source used in the automotive field, can greatly enhance the brightness of the backlight. However, there are thousands of LED lamps behind the crystal TV. How to effectively control these lamps is a very important issue. So Sony has adopted a new management system that can accurately control a large number of LDE lamps.
The third point is that it is a high-density direct-type LED backlight. The real problem it brings is heat, but Sony does not use a special cooling system. Compared to other brands of liquid-cooled systems, or semiconductor cooling technology, Sony's product equipped with this technology is a normal TV design, not an industrial display.
The fourth point of a large number of LED lights will also bring a problem of energy consumption, but Sony has advanced driving algorithms that can be very good balance of energy consumption, in terms of Sony's 85-inch prototype, in the case of ultra-high brightness Maintain the same level of power consumption as an ordinary 85-inch TV.
Superior light control, more accurate and detailed use of good light source
Unique optical design, ultra high brightness LED, high density direct type LED, but no cooling system, while maintaining power consumption with precise backlight algorithm. The picture reflected by the traditional backlight technology, the vertical axis is the brightness level, the brightness is basically constant, so in any scenario is the same power consumption. The Sony TV can accurately analyze the picture, find dark scenes, bright scenes, brightly enhance the bright scenes, and control the dark scenes locally. The energy of the local light control area is transferred to the bright part, so that the energy consumption can be well controlled. This is a very unique and sophisticated light control technology.
Elite optical control technology has been placed on Sony TV two years ago and is a very good help for this Backlight Master Drive technology. Traditional direct-backlight backlights have relatively few backlight partitions, and each partition is relatively large, so that the highest brightness can not be achieved more accurately. With the Backlight Master Drive system, the partitions become more refined, and more energy saved can be used to improve the brightness of the screen. This can restore a very good picture while maintaining energy consumption.
The human eye system will have some phenomena of diffusion and stray light, and there is also a limit to the light source's recognition ability. For example, we see a light source at a point on a plane and a light source at a small spot. It scatters back into a piece in our eyes to get an almost uniform perception. Therefore, according to the principle of renewal, we can research and find a reasonable number of partitions and sizes. In this way, a certain number of LED backlight distributions can be used to create an effect that meets the perception of the light source by human eyes.
Several important parameters of Backlight Master Drive:
First: maximum brightness. Backlight Master Drive can reach a maximum brightness of 4000 nits or cd/m2.
Second: global and local contrast, the human eye's perception is close to RGB Led.
Summary: Many people will say that OLED is not the future development of technology? Is it a direction for the future? Actually not. Why do you say that? Because RGB Led can't do that much. Why have you been stressing RGB Led? Because RGB Led is the best effect. What everybody sees on the market now is the white light OLED backlight OLED TV, its technical principle is totally different, it can't show the complete color space. Sony's performance improvement on the LCD, through the new Backlight Master Drive technology allows us to obtain large size on the LCD TV at the same time, as well as the reduction of contrast effect or color display effect near the OLED, which can be achieved on the LCD. Therefore, LCD should still be a mainstream trend in the next few years.
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