Sidney Gray

A qualified small-pitch LED display that can stand the test must have undergone strict relevant tests before leaving the factory. Only in this way, after it is officially delivered to customers, can it guarantee a long period of normal operation and good display effect, and reduce the failure rate. Let's take a look at the evaluation standards and methods of government purchasers for small-pitch LED displays 1. Test methods and conditions for small-pitch LED displays (1) Equipment: 1 Blu-ray high-definition player with 1080P (1920×1080 full frame) resolution; 1 high-performance computer with 1080P HDMI output; 1 video signal splitter with 1-to-4 component component output. (2) Standard video sources, pictures, etc. for testing: blue light source disk; professional test video Hi-Definition Reference (select multiple scenes); DisplayX, SJ/T 11281-2007 "Light Emitting Diode (led screen solutions) Display Screen Test Method" standard Test software; computer-generated 1080P standard color scale, full-color gradient, gray scale and pictures from the Internet, pictures intercepted or generated by the above two items, etc., night scene pictures of highway bridges. (3) Test method: Before the official evaluation, each manufacturer is allowed to conduct on-site debugging for its own LED\large screen (due to the limited size of the site, it is recommended to test the resolution 720P or 1080P line of the splicing screen) to achieve the best results of their respective products. best effect. Beginning at the specified time, a review team will be composed of a number of experts with rich experience in image transmission, video display, and LED large-screen hardware to evaluate the actual application effect. 2. Evaluation requirements for small-pitch LED displays (1) Grayscale image test ①Grayscale and color scale tests have always been an important indicator reference for large screens such as DLP/plasma/LCD/LED or spliced large screens, and are used to evaluate the gray scale transition capabilities of large screen splicing and controllers (if any), and Black and white conversion capability, etc. The more obvious the contrast, the stronger the ability of the display system to process the color picture. The bidirectional grayscale signal is used to test the at least 16 grayscale levels that the system should display. If each level can be distinguished, 3 points will be awarded; if there is less resolution, 1 point will be reduced, and the lowest point for this item is 0 points. 25 + 2 levels of gray scale images must be able to distinguish the darkest 3 gray levels A, B, C and the brightest 3 gray levels U, V, W on the screen at the same time. A, B, and C must have layers and cannot look black; similarly, U, V, W must also have layers and cannot look white. If there is any color/color cast in the large-screen image during playback, points should be deducted. If there is no color difference (black and white impurity and other colors), add 2 points. If there is color cast, deduct 1 to 2 points as appropriate. ②Comprehensive test of sharpness and gray scale. This scene is used to comprehensively test the line count, gray scale, geometric distortion and other performance of the entire system. Under 1080P (1920×1080), each gray level and number of lines should be clearly identifiable, and the black and white purity of the gray scale can also be tested. 1 point is deducted for one question; minimum 1 point. ③Grayscale real scene map. The more black and white levels are displayed, the better the gray scale processing capability of the system can be reflected. Minimum 2 points, maximum 5 points. (2) Color picture test ①Comprehensive test of the dark part of color pictures. This scene is a night scene, which focuses on the changes in the strength of color light and shade and halo, and is used to test the system's color, grayscale, and detail display and other performance. The boat on the left under the bridge and the top halo above the main tower and the cables on the bridge deck can be clearly distinguished, scoring 4 points. If there is a problem, 1-2 points will be deducted depending on the severity. If there is no problem in distinguishing light and dark changes in other details, add 1 point. ②Highlight detail test: A test of detail restoration ability based on bright white. The scene is a dining table and dressing table with relatively high brightness. The main test is the restoration ability of the white part of the system under high light and the dynamic range of grayscale. The details of the texture of the window curtain, cloth, brush and other objects should be completely preserved. All items are met, 5 points. If there is any non-compliance, 0.5 points will be deducted for each item, and a maximum of 2 points can be deducted in total. ③ Face detail sharpness test. This scene is a close-up static picture of a girl and flowers, reflecting the fidelity of the large-screen stitching system to various details such as skin color and spots on the face and the authenticity of the skin color. The total score is 5 points, if the facial details are not clear, 0.5 points will be deducted. If the facial color is impure, 1 point will be deducted ④ Color reproduction test. Mainly test the uniformity of color and the purity of white. It is very important to restore the various ingredients and fruit colors in the kitchen, the pure white crystals on the tray and the barrel of the colored pencil, the wood grain part, the grassland, and the cloud layer. If the white is impure, 1-3 points will be deducted depending on the purity of the color cast. The full score is 5 point . ⑤ Color saturation and detail test. The fluff at the edge of the ball of wool should be clearly visible, as should the grain of the spool and the padding. 5 points out of 5. If the fluff is not clear, 1 point will be deducted; if the texture of the spool is not clear, 1 point will be deducted; if the texture of the doily is not clear, 1 point will be deduct d. (3) Dynamic scene t st Waves and Reefs (ROCK&WAVE, Blu-ray video source: 00014.m2ts). This scene is a reef scene, which is used to test the image quality of the device against a static background containing a lot of small movements, especially the white balance and detail resolution. In addition, the Fog (water mist) produced by the waves at the 20-27s playback place should be clearly distinguished. 5 points for a full score, if the level of waves and reefs is not clear, 0.1 to 1 point will be deducted as appropriate. If the FOG is not clearly displayed, 0.5 to 2 points will be deducted as appropria e. ① Light and dark detail test (Tokyo Night, Blu-ray video source: 00019.m2ts). This scene is a moving image of the Tokyo night scene, which is mainly divided into 4 scenes: the tower illuminated by lights; the Christmas tree embedded with lights; the night scene of the bridge and both sides; the night scene around the Ferris wheel. The main test system is the color reproduction ability and the dynamic range of light and dark contrast during dynamic video playback. The mesh details in high-brightness neon lights, Christmas tree details, dark details on both sides of the bridge, bright parts of the Ferris wheel and dark details of the street should be completely preserved. The minimum score is 2 points, and the maximum score is 5 points (if the details and levels of each item are unclear, 0.1 to 1 point will be deducted as appropria e). ②Black and white contrast test (Black&White, Blu-ray video source: 00020.m2ts). It mainly tests the edge resolution ability of black and white scenes and black and white dressed people. The highest score is 5 points, and the black background and the edge of the black clothes can be clearly distinguished, and the score is 3 points. If the white background and the edge of the white clothes can be clearly distinguished, 2 points will be awarded. If the edge of the same color is unclear, 1 to 2 points will be deducted as appropri te. ③Color expressiveness: accessories (Accessory, blue light test source: 00021. m2ts). The main scenes are flowers and accessories (necklaces, gloves, feather accessories, etc.), mainly testing the permeability of colors and the texture of items. In addition, the display of the tiny fluttering details of feathers is also very important. The highest score is 5 points, if the level of the flower is not enough, 1 point will be deducted; if the feather details are not clear, 1 point will be deducted; if the color is not transparent, 1 point will be deduc ed. ④ Dark detail test (Black Image Blu-ray test source: 00027.m2ts). The more black and white levels are displayed, the better the system's ability to handle dark details, and the higher the number of gray levels that can be displayed and restored. If the black level is clearly distinguished, the full score is 10 points; if the level of the black part is insufficient, 2 to 6 points will be deducted as appropr ate. The rest of the tests will not be described in de ail. (4) Professional software testing (DisplayX se ies) ①Pure color: Black, RGB, P (purple), Y, C (cyan), White. Black and white and 6 solid colors are displayed, and the overall color is uneven, with a total deduction of 0 to 1 point, compared with the same period last year. If there is a bad pixel, 2 to 3 points will be deducted depending on the number of bad pixels, compared with the same period last year. Maximum 5 po nts. ②Color and gray scale: Gradient test (no polarization). The R/G/B three-color signal with chromaticity gradient from left to right and the Y/Purple/Cyan after the two colors are mixed are used to test the chromaticity and grayscale changes of the system. The gradient has no sense of step, that is, the smoother the transition, the higher the grayscale level of the system. The gradient of each color is transparent, and there are no faults and vertical steps, the full score for this item is 5 points. Different colors are graded according to the degree of severity, and 1-3 points will be deducted compared with the same period last ear. ③Full color gradient. Full chromatogram gradient and no polarization change, the brighter and more transparent the color, the better. If there are more steps in each color, the less ideal, the corresponding points shall be deducted during the evaluation; the closer the display of each color is to the vertical, it proves the gray scale of each color The more synchronized the changes, the better. Gradient and transparent, without faults and vertical steps, this item is 4 points. If there is no uneven color change during the gradient, another 1 point will be awarded for this item. Depending on the severity of color faults, 1 to 3 points will be deducted compared with the same period last year.

LED devices account for about 40% to 70% of the cost of LED displays, and the substantial decline in the cost of LED displays is due to the reduction in the cost of LED devices. The quality of LED packaging has a great influence on the quality of LED display. The key to packaging reliability includes the selection of chip materials, packaging materials and process control. In addition, strict reliability standards are also the key to verifying high-quality LED devices. With the gradual penetration of LED displays into the high-end market, the quality requirements for LED display devices are also getting higher and higher. Based on the actual experience of high-quality LED display device packaging, this article discusses the key technologies for realizing high-quality LED display devices. 1 Current status of LED display device packaging SMD (Surface Mounted Devices) refers to surface-mounted package structure LEDs, mainly including PCB board structure LEDs (ChipLEDs) and PLCC structure LEDs (TOP LEDs). This article mainly studies TOP LEDs, and the SMD LEDs mentioned in the following text all refer to TOP LEDs. The main materials used in the packaging of LED display devices include brackets, chips, die-bonding adhesives, bonding wires, and packaging adhesives. The following introduces some basic development status in China from the aspect of packaging materials. 1.1 LED bracket (1) The role of the bracket. The PLCC (Plastic Leaded Chip Carrier) bracket is the carrier of the SMD LED device, which plays a key role in the reliability and light output of the LED. (2) The production process of the bracket. The PLCC stent production process mainly includes metal strip punching, electroplating, PPA (polyphthalamide) injection molding, bending, five-sided three-dimensional inkjet and other processes. Among them, electroplating, metal substrates, plastic materials, etc. occupy the main cost of the bracket. (3) Structural improvement design of the bracket. Because the combination of PPA and metal in the PLCC bracket is a physical combination, the gap will become larger after the high-temperature reflow oven, which will cause water vapor to easily enter the device along the metal channel and affect reliability. In order to improve product reliability and meet the high-quality LED display devices demanded by the high-end market, some packaging factories have improved the structure design of the bracket. For example, Foshan Guoxing Optoelectronics Co., Ltd. adopts advanced waterproof structure design, bending and stretching, etc. The method is to extend the water vapor entry path of the bracket, and at the same time add multiple waterproof measures such as waterproof grooves, waterproof steps, and water holes inside the bracket, as shown in Figure 1. This design not only saves packaging costs, but also improves product reliability. It has been widely used in outdoor LED display products. SAM (Scanning Acoustic Microscope) was used to test the airtightness of the bent structure designed LED bracket after encapsulation and the normal bracket, and it can be found that the product with the bent structure design has better air tightness. 1.2 chip The LED chip is the core of the LED device, and its reliability determines the life and luminous performance of the LED device and even the LED display. The cost of LED chips accounts for the largest total cost of LED devices. With the reduction of cost, the cutting of LED chip size is getting smaller and smaller, which also brings a series of reliability problems. The structure of the LED blue-green chip. As the size shrinks, the pads of the P electrode and N electrode also shrink. The shrinkage of the electrode pad directly affects the quality of the bonding wire, and it is easy to cause the gold ball to detach during the packaging process and the use process, and even the electrode itself to detach, eventually failing. At the same time, the distance a between the two pads will also be reduced, which will cause the excessive increase of the current density at the electrode, the current will gather locally at the electrode, and the uneven distribution of current will seriously affect the performance of the chip, causing the chip to appear local temperature Too high, uneven brightness, easy leakage, electrode drop, and even low luminous efficiency will eventually lead to a decrease in the reliability of the LED display. 1.3 Bonding wire Bonding wire is one of the key materials of LED packaging. Its function is to realize the electrical connection between the chip and the pins, and to play the role of current import and export between the chip and the outside world. Commonly used bonding wires for LED device packaging include gold wires, copper wires, palladium-plated copper wires, and alloy wires. (1) GOLD WIRE. Gold wire is the most widely used and the most mature technology, but it is expensive, resulting in high LED packaging costs. (2) Copper wire. Copper wire instead of gold wire has the advantages of low cost, good heat dissipation effect, and slow growth of intermetallic compounds during wire bonding. The disadvantage is that copper is easy to oxidize, has high hardness and high strain strength. Especially in the heating environment of the bonding copper firing ball process, the copper surface is easily oxidized, and the formed oxide film reduces the bonding performance of the copper wire, which puts forward higher requirements for the process control in the actual production process. (3) Palladium-plated copper wire. In order to prevent the oxidation of copper wires, palladium-plated bonding copper wires have gradually attracted the attention of the packaging industry. Palladium-plated bonding copper wire has the advantages of high mechanical strength, moderate hardness, and good solderability into balls, which is very suitable for high-density, multi-pin integrated circuit packaging. 1.4 Glue At present, the glue used for LED display device packaging mainly includes epoxy resin and silicone. (1) Epoxy resin. Epoxy resin is easy to age, easy to get wet, poor heat resistance, and easy to change color under short-wave light and high temperature. It has certain toxicity in the colloidal state. The thermal stress does not match the LED very well, which will affect the reliability and life of the LED. . So the epoxy resin is usually attacked. (2) Silicone. Compared with epoxy resin, silicone has higher cost performance, excellent insulation, dielectric and adhesion. But the disadvantage is poor air tightness, easy to absorb moisture. So it is rarely used in the packaging application of LED display devices. In addition, high-quality LED displays also put forward special requirements for display effects. Some packaging factories use additives to improve the stress of the glue, and at the same time achieve a matte matte effect.

The total mileage of expressways in my country has exceeded 100,000 kilometers, ranking first in the world, and a high-speed driving network has been formed, which symbolizes the rapid development of my country's economy. At the same time, the highway LED information release system has gradually entered the public's field of vision and played its biggest role in the convenient, fast and safe driving of the highway. In order to meet the needs of the market, high-density LED display screens and seamless splicing screens have emerged as the times require, and have been applied in the field of transportation and highway engineering. Three courses of seamless splicing technology development From the perspective of its development process, seamless splicing technology has gone through three processes, namely, pure hardware fusion technology, pure software fusion technology and software and hardware fusion technology. Pure hardware fusion technology mainly refers to the use of optical shading principles to fuse multiple images together. The software-only fusion technology uses electronic circuits to process images. The software-hardware fusion technology uses the above two technologies in combination, which includes both optical shading fusion technology and electronic fusion. Compared with the first two technologies, its display effect is relatively good. This is because the hardware fusion technology can solve the black balance problem in the image processing process, and the software fusion technology has a positive effect on the processing of the image white balance. The two technologies complement each other and can enhance the authenticity of the reproduced image. In terms of splicing effect analysis, the seamless splicing technology has also gone through three processes, specifically hard edge splicing, overlapping splicing and soft edge fusion splicing. In the process of applying the hard-edge stitching technology, there are inevitably some seams, which lead to many deficiencies in the panoramic reproduction work; overlapping stitching specifically refers to: using two projectors to superimpose the projected images at the stitching place, so as to achieve overlapping effects. Compared with hard-edge splicing technology, this splicing technology has many advantages, but it also has certain limitations. This stitching method may cause overly bright areas on the display due to the excessive number of image overlays. As a result, it will adversely affect the application of seamless technology. Soft-edge fusion stitching is to use edge fusion technology to process images. This not only makes the two sides blend better, but also effectively prevents the generation of overly bright areas. In addition, the soft-edge fusion splicing technology has a relatively wide range of applications and can be used on planes, cylinders, and spheres. Highway seamless LED splicing technology makes full use of this advantage to provide guidance for the construction of highway projects. Eight application advantages in highway engineering: 1. Completely solve the visual defect of splitting large-screen splicing images, and realize complete seamlessness In specific work, the seamless LED splicing technology can completely solve the problem of screen segmentation and meet the requirements of complete seamlessness. Looking at the large-screen splicing system in my country at this stage, there are still many splicing seams in the work of many display screens. For example, in the LCD splicing system, the gap is too large to meet the needs of users. The plasma and rear projection large-screen splicing systems have more advantages than the liquid splicing technology. However, from the perspective of their visual effects, there are still a large number of dividing lines. Even if LCD, DLP, and PDP technologies are applied in the project, and the technical requirements are raised to the highest level, the gap can only be reduced, but cannot be completely eliminated. So far, the best level of patchwork technology is "seamless", "narrowest", "nearly seamless", etc. However, this still cannot deny the existence of gaps. The use of seamless LED splicing technology can improve the screen resolution in a small area, ensure the texture of the picture, and meet the needs of users for close viewing. Compared with the existing splicing technology, LED physical seamless splicing can realize cross-screen display. For the seam, the level of its level does not lie in the size of the gap, but the existence of the gap. Highway seamless LED technology adopts unique technology to connect each unit together and make up for the defects in the design process with special technology. In this way, the uniform distribution of the pixel pitch can be achieved, and the purpose of eliminating seams can be achieved. 2. Thoroughly solve the problem of inconsistency in splicing large screen brightness and chromaticity attenuation The application of highway seamless LED technology will effectively handle the situation of different brightness and chromaticity attenuation of splicing large screens. In this technology, point-by-point brightness and chromaticity correction technology is generally used, which ensures the uniformity of brightness and chromaticity. For example, the application of point control technology creates a platform for users to correct chromaticity and brightness point by point, and controls the pixels of the screen to achieve a high degree of image restoration. This technology also has SMS and E-mail reminder functions, which can allow users to grasp the status information of the splicing wall in a timely manner. 3. Intensive display and control platform handles all surveillance video sources Seamless LED technology applies an intensive display and control platform to ensure the reliability of surveillance video sources. The intensive display and control platform can create a management platform for customers, and effectively realize the management of video signals, computer signals, and network signals, and provide users with better services. 4. Powerful redundant backup design for power supply and signal to ensure safe and reliable use In the design of the seamless LED system, the redundancy of power supply and signal is backed up, which can reduce the occurrence of problems during its use. This is mainly reflected in the following aspects: (1) Signal redundancy design control. In the highway seamless LED technology, the signal redundancy design adopts dual signal channels, and it is expressed as N+1 redundancy and supports hot swapping. (2) Optimize the decentralized power supply design to centralized power supply, reduce the key heating parts of the screen body, and save energy more efficiently; the integrated power supply N+1 redundant design, intelligent current sharing when the power supply fails, and improves the safety of use. In addition, the power supply supports hot swapping, making maintenance simple and fast. 5. Ultra-long life, simple maintenance process, and ultra-low maintenance cost Compared with ordinary display screens, LED has a longer service life, and its maintenance and repair costs are relatively low. Taking the seamless LED technology in a certain project as an example, the LED standard unit and the display panel are made up of smaller units (L2.5: 200*80mm/block-8.5 inches): the display pixels are individual LED lights Composition; if necrosis occurs, replace it with a spare unit and repair one LED light; if the panel is irreparable, replace a small display panel; take the 32-inch display area as an example, the area is only the traditional 4% of the panel. At present, the mainstream is 46-inch, 55-inch and 60-inch splicing units, and the proportional cost will be lower. In addition, in this case, the size of the DLP monitor in the seamless LED system is generally 50-100 inches, and the lifespan is about 8000h. If there is a problem with the projection bulb and panel, the LCD monitor needs to be replaced as a whole, and the size is generally 40 to 100 inches. The glass panel breaks easily and needs to be replaced as a whole. 6. Super large viewing angle, super high contrast, super high refresh rate The project provides a larger viewing angle and prevents the occurrence of reflections. Based on the analysis of the above engineering case, it uses a matte black bottom panel and a black lamp bead surface, which breaks through the limitations of traditional screen reflections. The contrast ratio is as high as 4000:1, and the color expression is better. In addition, its fill rate and contrast ratio are also very high. When taking pictures, the state is relatively stable, and when dealing with dynamic display pictures, the edges of the images are clear, with good dynamic expressiveness, and the image information is accurately and truly restored. Make the video picture delicate and smooth, bring the greatest visual enjoyment. In addition, it is particularly pointed out that the brightness uniformity of the LED screen is excellent, and with the single-point brightness correction, the brightness uniformity of the entire screen tends to the extreme. 7. Ultra-thin, ultra-light structure, ultra-quiet heat dissipation technology In the application process of seamless LED splicing technology, ultra-quiet heat dissipation treatment technology is also adopted. The engineering case I studied mainly uses high-performance heat-conducting material aluminum plate for overall heat dissipation, and the left and right wings of the unit shell take away the heat in the box through convection grooves, which is conducive to maintaining the same temperature as the environment. The large-area aluminum heat dissipation surface on the back of the box is an attached heat sink for circuits and ICs. The good self-heating design and convection scheme ensure that the product is ultra-quiet and has strong heat dissipation. 8. Dynamic energy saving, ultra-low power consumption, green light source, energy saving and environmental protection, no pollution (1) Low power consumption and energy saving technology When the LED high-definition display wall is working, different power consumption will be generated with the change of the picture; that is, it is equivalent to a part of the peak power consumption, generally between 30% and 50%; there are differences depending on the display content; traditional splicing large screens When working, no matter what the screen content is, even if the screen is black, it still maintains a constant power consumption, that is, the required power. (2) Energy saving and environmental protection, non-polluting products Pollution-free traditional splicing large screens have various environmental pollution sources such as mercury, ultraviolet rays, and auxiliary radiation due to their luminescent materials and working principles. The led video display screen; Going to 220ds.ru, high-definition display directly emits light to display products. The LCD light source is a backlight bulb (tube), and its light-emitting medium is mostly tungsten, lead, etc., which has no significant impact on the environment. In the process of highway construction, the seamless LED splicing technology is used to make the picture of the entire screen very clear, and the viewing angle is relatively large, which is very beneficial to engineering construction.

LED creative display, as we all know, has opened up another market in the LED display industry with its unique product shape, unique customization and personalization. In the current creative display field, it can be seen that the application range of LED special-shaped screens is also expanding. So how to enlarge the characteristics of LED creative display products, the summary can be summarized into the following points: 1. The creative display screen must conform to the architectural structure of the installation site. Different scenes use different product shapes and structures, and you can also customize the shape that best fits the scene. Use triangles, rectangles, and arcs of different sizes to stitch together distinctive shapes. The tunnel scene uses a curved screen, and the bar uses a unique DJ booth, but it is not limited to these scenes and these displays. 2. The shape of the creative display screen should be as close as possible to the cultural theme that needs to be reflected in the scene. The relationship between the shape of the creative display and the application site can enhance the recognition of the brand or scene. For example, Ming Xingguang's Guangzhou Baiyun Airport case is a good example. Mingxingguang's existing special-shaped products cannot be combined with all cultural themes, so customers need to communicate with us during application to customize suitable ideas. 3. Playing materials that match the shape of the creative screen. There are many kinds of materials to play, but the materials are very important to make the creative screen show a perfect display effect. The display material must match the product shape to reflect the difference between the creative screen and the conventional screen. The display material and the shape use the same outline, the material is within the indoor video wall display range of the shape, and other features are combined to make the creative display shine.

As a composite integration technology combining display technology and LED technology, Micro-led panel screen indoor has many advantages and is popular with the public, but at the same time, there are still many technical problems that hinder its market development. Micro-LED is a micron-scale LED light-emitting pixel based on active addressing drive and mass transfer technology. It has the advantages of self-illumination, high efficiency, low power consumption, high integration, high stability, and all-weather work. Considered to be a very promising next-generation new light-emitting and display device, Micro-LED display is an inevitable trend of LED display technology. Technology Status Micro-LED has been developed for more than ten years, during which many project teams around the world released results and promoted the further development of related technologies. At present, the leading technologies in the research of Micro-LED technology are the passive addressing Micro-LED technology of Professor H.X. Jiang of Texas Tech University, the high-resolution Micro-LED technology of active addressing of Professor Liu Jimei and Dr. Liu Zhaojun of Hong Kong University of Science and Technology. LED fully integrated technology and color painting technology, Professor Martin Dawson of the University of Strathclyde in the United Kingdom Micro-LED technology combined with biological detection. my country's Micro-LED technology is at the same level in the world, and the active addressable high-resolution Micro-LED fully integrated technology and color painting technology are internationally leading. Application fields, market size and latest developments Micro-LED displays are expected to grow rapidly in the next five years. It is estimated that smartphones and AR/VR applications will be introduced after 2020, and shipments will reach 330 million units in 2025. In the future, only the potential market size in the display field can be Reached around 30-40 billion US dollars. MicroLEDs can be deployed in any display application from the smallest to the largest. In many cases, they will be better than the resulting combination of LCD and OLED displays. However, current production feasibility and economic costs limit their use. In the future, Micro-LED will expand to wearable/implantable devices, AR/VR/MR, optical communication/optical interconnection, medical detection, smart car lights, space imaging and other fields. The main developments in the Micro-LED field in recent years are: Domestic research and development status In recent years, as Micro-LED has become increasingly popular, universities, scientific research institutes, and major enterprises in my country have announced to join the R&D camp. In terms of universities, the teams of Southern University of Science and Technology and Hong Kong University of Science and Technology started earlier and accumulated certain research results; Nanjing University has carried out exploratory work on deep ultraviolet detector arrays; Fuzhou University has done some research in space imaging. In terms of enterprises, BOE, TCL, Yimei Xinguang, Sanan Optoelectronics, Huacan Optoelectronics, Qianzhao Optoelectronics, NationStar Optoelectronics, Visionox, JBD, etc. have all invested in different degrees (the project has been formally approved or is in the stage of preparing for the establishment of the project, or buy companies, or buy patents). In November this year, Sanan Optoelectronics reported its passive addressable Micro-LED array at the Nanjing Micro-LED Conference. Unsolved problems of Micro-LED In the development of Micro-LED, there are still many technical and industrial problems that need to be solved: At present, China has become the world's largest LED and LCD production base, and the supporting facilities in the Micro-LED industry chain are relatively complete. Therefore, China has the conditions for synergy in the Micro-LED industry chain. It is believed that with the support of national policies and funds, we can give full play to the advantages of my country's LED and LCD industries, and it is expected to realize the corner overtaking of my country's display industry through Micro-LED.