Ultra HD Shows The Trend Of Entering The Home

Mr. Tu Menglong said that the initial construction of the 8K Ultra HD video industry ecosystem has been completed, and 2021 will be the year when the 8K Ultra HD video industry will start to land.

However, in order to achieve the landing of 8K Ultra HD video industry applications, 8K Ultra HD video into the home is the only way.

8K Ultra HD video to enter the home, 100 "~180" screen is a necessary equipment conditions, because from the physiological characteristics of the human eyes and viewing distance, less than 100 "display screen is too small, watching distance is not close to bring immersive experience, play 8K video Ultra HD advantages.

There are many technologies to achieve ultra-large display sizes over 100 ", because Micro LED has the advantages of self-illumination, high contrast, wide color gamut, long life, faster response time, unlimited size expansion, ultra-high pixel density and so on.

The COB-based Micro LED display technology is the first choice for 8K Ultra HD displays.

In addition to bringing 8K experience to home users in terms of performance, Ultra HD display based on COB technology is also a significant factor in determining whether it can enter the home market in the future.

Based on the technical architecture of COB itself, there are several feasible directions for cost reduction: LED chip, COB substrate, LED drive technology, LED display control technology, Micro LED pixel engine technology, and high yield production process.

The LED chip

LED chips currently have forward assembly, vertical and flip structure.

Formal chip is mainly used at present 4*6mil, which can achieve the minimum point spacing of P0.9, is the highest cost-effective chip structure at present.

Vertical chip is mainly used in 5*5mil, the minimum point spacing that can be achieved is P0.6, and the cost performance is in the middle at present.

Flip chip is mainly used at present 4* 8mil /4*6mil, the future will go to 3*5mil, flip chip can achieve the smallest point spacing, but the current price is high, low cost performance.

Lehman photoelectric currently uses the highest cost - effective chip.

COB substrate

The plate of COB substrate can be PCB or glass.

The technical difficulty of PCB substrate, the main line distance, that is, the width of the Gap between the positive and negative electrodes of the substrate, and the strict quality requirements.

Conventional glass substrate side wiring, large size Micro LED can not be stitched.

The technical difficulty of large size Micro LED glass substrate, mainly online passing holes, that is, punched holes on the glass substrate, as well as multi-layer board technology, can achieve display panel splicing.

LED Driver Technology

At present, the main driving technology routes include PCB substrate combined with passive driving technology, TFT glass substrate combined with active driving technology and PCB substrate combined with hybrid driving technology. At present, each technical route has its own advantages and disadvantages. PCB substrate combined with passive drive technology is through the backplane wiring, can be seamless stitching, technology is relatively mature, but the cost is high.  TFT glass substrate combined with active drive technology adopts side wiring, which cannot be stitched seamlessly. It can be applied to large-size display of Micro LED with a lower cost, but the current technology is not mature enough. PCB substrate combined with hybrid drive technology is back wiring, can be seamless stitching, although the cost is lower, but the technology is not mature.

LED display control technology

The sequence of video signal transmission is from the video source, splicing controller, receiving card, driver IC, and LED. With the development of LED display screen towards micro-spacing and ultra-small spacing, the traditional LED screen control technology has faced bottlenecks. There is room for optimization of splicing controller, receiving card and driving IC, etc., and the LED display control technology will develop towards a leaner and lower cost direction.

Micro LED pixel engine technology

Rayman introduced the Micro LED RGBG permutation combined with the Pixel Engine algorithm.

Pixel engine technology can make the cost per pixel lower, and at the same time, the number of pixels can be doubled under the same display area, which means that the 2K screen can be changed to 4K screen with a small increase in cost, and the cost of 4K screen or even 8K screen can be greatly reduced.

High yield production process

The production process of ultra-high definition display based on COB technology involves many aspects, such as substrate, solid crystal/mass transfer, welding line/reflux, glue sealing, online maintenance, correction and so on.

If each link can be close to zero defect, it will ensure a high yield rate of production, and ultimately bring cost effectiveness. In the future, Micro LED ultra-high definition display screens will continue the development law of the industry and enter the price range. At that time, when the price of Micro LED ultra-high-definition display reaches the sweet spot, Micro LED ultra-high-definition display will enter the home, and then accelerate the application of 8K, combining high resolution, wide color gamut, high gray scale, HDR, high refresh rate, high frame rate and other display quality.

Finally, more users can enjoy the immersive experience brought by ultra-high definition display.