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2019-07-04

Why is Ledman's upcoming 8K MicroLED a hot topic?

Author :ledman Reading :348

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  A few days ago, Ledman officially announced that during the July 17th Beijing Infocomm exhibition, the world's first 324-inch 8K ultra-high-definition MicroLED display. This incident has not only triggered the forwarding of major media, but also attracted the attention and hot discussion of many people in the industry. Many investors have asked, what are the characteristics of this latest MicroLED display based on COB technology, which will make everyone pay attention to it?

  We found that the reasons for this event may be as follows.

  5G background

  So, everyone is very curious, Why 5G technology is better than 4G technology? Why do humans want to be crazy about 5G?

  To put it simply, if 4G is like a provincial road, 5G may be a high-speed rail.

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  The statement of Xu Ziyang, executive director and president of ZTE, is worth borrowing here. He said: 5G is a smarter network.

  For example, in the 4G network, all users are mixed in a runway, just like going to the cafeteria to eat and affects each other, everyone experience is not good. But 5G is different. Different people can go to different canteens according to their own needs, so that your experience is completely different. Xu Ziyang said that the most optimistic business has two: one is big video, HD business; the second is industrial Internet business.

  8K is coming

  Exactly, Xu Ziyang told us that one of the two major applications of 5G: big video and HD business, let everyone be optimistic and excited.

  Let's take a look at the policy push.

  In March 2019, the Ministry of Industry and Information Technology, the State Administration of Radio and TV , and the Central Radio and TV General Station issued the "Ultra HD Video Industry Development Action Plan (2019-2022)", clearly proposing to 2022,  The core components such as CMOS image sensors, optical lenses, professional video processing chips and codec chips, and the 8K front-end core equipment has formed the industrialization ability ; 4K TV terminals that meet HDR, wide color gamut, 3D sound, high frame rate, and high color depth requirements are fully popularized, 8K TV’s terminal sales the proportion of total TV sales exceeds 5%.

  In this way, as the most anticipated 8K TV in 5G applications, everyone is beginning to work hard in this direction.

  How to understand the combined application of 5G and 8K?

  To put it simply, the biggest bottleneck in 8K video is the need to transmit a large amount of data. Let's take a look at it: a standard 2K HD image has a resolution of 1920×1080 and a pixel count of more than 2 million. The resolution of 8K ultra-HD images is 7680×4320, and the number of pixels is more than 33 million, which is 16 times of the pixels of 2K HD images.

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  In addition, according to the current mainstream H.265 and AVS2 standards, the transmission rate of 8K video must be at least 48-160 Mbps.

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  The current 4G transmission bandwidth is simply not met. But in the 5G context, it may be so easy.

  Because the demand for 200Mbps bandwidth is required for 8K video transmission, and the 5G standard issued by the ITU, the downlink peak rate can reach 20Gbps, and the uplink peak rate can reach 10Gbps. The 5G network can fully meet the requirements of 8K video high bandwidth.

  Based on COB technology

  So what is the specific relationship between this and Ledman's "324-inch 8K Ultra HD Micro LED Display"?

  We guess this is the case.

  First of all, because 8K video needs high resolution, high frame rate, high color gamut, high color depth, high dynamic range and other features, in order to reflect the immersive customer experience of 8K ultra high definition video.

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  Secondly, at present the main technologies that can display over 100 inches and large screens, and can satisfy the above immersive experience are: Micro LED micro-display technology based on COB, SMD fine pitch display technology, LCD  technology, laser projection TV technology, etc. .

  From several perspectives, micro display technology, which may be based on COB technology, is more attention. Why do you say that?

  First, let's look at LCD technology. When LCD technology is used for 8K display above 100 inches, the LCD panel is too large, and the size of the whole machine without outer packaging is the length is more than 2 meters, the width is more than 1 meter, which cannot meet the basic needs of transportation and households. In addition, LCD technology has inherent disadvantages in color gamut. Generally, the color gamut of LCD screen is 65-75% of NTSC color gamut, which cannot meet the ITU-R BT.2020 color gamut range of 8K display requirements.

  Let's look at laser projection TV technology. This is a passively luminous display technology. Originally, the laser short-throw projector was used to cast a light-resistant screen, which was able to obtain a large-screen display of 100 inches or more. But it is still awkward, there are three congenital shortcomings: one is that the anti-light curtain is lower in contrast than other display methods, and it is impossible to achieve high dynamic range HDR; the other is that the color gamut loss is large after the anti-light curtain reflection, which can not reach the range of ITU-R BT.2020 gamut needed for 8K display; the third is that the brightness of the projection display is still low.

  Then we look at SMD fine pitch display technology. This technique is difficult to achieve mass production with a dot pitch of less than P1.0. Even with the all-in-one technical blessing, it still inherits 99% of the SMD technology gene and may still be considered to be still in the ranks of low reliability.

  So if this is ruled out, the “MicroLED” micro display 8K screen based on COB technology may be favored.

  Here are a few key technical points:

  1. It can achieve 100-120Hz at the frame rate, which can greatly improve the image blurring phenomenon of the video during strenuous exercise.

2. In terms of color depth, it can reach the 12-bit color depth required by 8K video, which can greatly improve the smooth transition of light and dark pictures and present high-quality light and dark picture details.

3. On the high dynamic range HDR, the MicroLED display 8K screen based on COB technology can achieve high contrast ratio greater than 10000:1, with the circuit design supporting HDR, make the black place of the image picture is blacker and the bright place is brighter. You can see the details of the picture in the dark and the highlight at the same time, and improve the 3D and layered feeling of the picture.

4. In terms of color gamut, it is wider than NTSC, DCI-P3, and ITU-R BT.709, and is only slightly smaller than the ITU-R BT.2020 color gamut.

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  As can be seen from the above figure, the color gamut triangle of LEDMAN COB is mainly different from the color gamut standard of ITU-R BT.2020. The wavelength range of LED green light chip is somewhat different, but it can be adjusted by cooperating with chip manufacturers. The wavelength range and other parameters of the red, green and blue LED chips can cover the gamut of ITU-R BT.2020 as much as possible, which is relatively easy to implement. Therefore, the MicroLED display based on COB technology can achieve or reach the gamut of ITU-R BT.2020. The larger the color gamut, the more colors that can be expressed,and it is more able to restore all kinds of colors in nature.

  Therefore, based on the positive 5G+8K, combined with the highlights of the COB technology route, it is a good explanation of the questions we have thrown at the beginning.

 



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