Since 2020, naked-eye 3D screens have gradually entered the public eye. From the wave tank in Seoul, South Korea, to the spaceship in Chengdu Taikoo Li, and the tricolor cat in Tokyo Shinjuku, naked-eye 3D screens have attracted countless people from all over the world. Compared with traditional 3D displays that require glasses or helmets, naked-eye 3D screens, which can be viewed without any equipment, seem to have a natural advantage. However, behind the naked-eye 3D screen, is it technological advancement or a visual trick? Human eye parallax/How to deceive the eyes to produce a 3D effect? As early as 1839, British scientist Wheatstone was pondering a question - "Why is the world we observe three-dimensional?" After research, he found that because there is a distance of about 6.5 cm between human eyes, when observing three-dimensional objects, the perspectives are slightly different, which produces binocular parallax. The left eye sees the left side, and the right eye sees the right side. There is a slight difference in the images seen. The object is imaged on the retina at the same time. The brain compares the two different "images" to distinguish the distance of the object, thus producing a three-dimensional effect. The effect that causes this three-dimensional sensation is called "visual displacement." It is this visual displacement that allows us to distinguish the distance of objects and obtain a three-dimensional sense of depth. When observing an object with both eyes simultaneously, each point on the object has an angle to both eyes. The closer the object is to the eyes, the larger the angle of each point on the object to the eyes, and the greater the visual displacement. The farther the object is from the eyes, the closer the lines of sight of the two eyes are to parallel, and the visual displacement is close to zero. It is difficult for us to judge the distance of the object, and we will not have a three-dimensional sense of it. Looking at the stars at night, it feels like all the stars are on the same spherical surface, and it is difficult to distinguish the distance. This is the result of zero visual displacement. Visual displacement is the basic principle of 3D movies producing a three-dimensional effect: during shooting, two cameras are used to shoot simultaneously, obtaining two synchronized images with differences. Then, polarized glasses are used to separate the content for the viewer's left and right eyes, so that the two eyes obtain different images for the left and right eyes respectively. In this way, there is a three-dimensional effect, and what is presented in the brain is the feeling of a 3D image. Naked-eye 3D screens also utilize the characteristics of human eye parallax, projecting the pixels corresponding to the left and right eyes to the left and right eyes respectively, thus producing a three-dimensional image, allowing viewers to feel the three-dimensional effect at a specific angle. How does "visual illusion" deceive the brain to produce a three-dimensional effect? The three-dimensional effect of a plane image is caused by the "visual illusion" processed by the brain, or the brain supplements the three-dimensional effect. When the brain processes plane images, it will calculate the distance and spatial sense. If the image does not provide enough information, the brain will actively supplement the depth when trying to judge the spatial depth of the image. Just as painters use the distance, size, shadow effects, and perspective relationships of objects in a two-dimensional image to construct a three-dimensional effect, making the brain misjudge the spatial sense and depth of the image, 3D video sources also use perspective and shadow relationships to expand and confuse spatial perception, causing visual illusions in the human eye, thus producing a realistic three-dimensional effect. Most plane naked-eye 3D screen video sources use the visual illusion of significant frames. When the brain selects obvious frames as distance reference objects, the dynamic image suddenly blocks the "front" and "back" of the frames, or the contrast between far and near is highlighted, forming an illusion of brain distance judgment, thus producing a three-dimensional effect. Most of the current popular naked-eye 3D screens are corner screens, which use two adjacent plane screens to present different sides of a three-dimensional object. They use spatial perspective and the imaging properties of two adjacent sides of a corner screen to create visual illusions of light and shadow, brightness and darkness, and reality and virtualness for the human eye, making the screen content appear three-dimensional. Each 3D video source needs to be customized according to parameters such as screen shape, size, and viewing angle. First, the optimal viewing angle is determined, then video content conforming to the perspective principle is created according to the viewing angle, then the box layout diagram of the display screen is used for corner positioning, and finally, a video source that presents a three-dimensional effect at a specific angle is output. Because the video source is created based on a specific angle to simulate the 3D effect, only by standing at a specific angle can you obtain the optimal viewing angle of the three-dimensional effect. If you are not standing at the optimal angle, the screen content will be deformed. This is why the shooting angles of most naked-eye 3D corner screens are the same, because only at a specific angle can you see the best 3D effect. In order to achieve perfect integration of creative content and the real environment and create an immersive 3D experience, designers need to customize video sources that conform to the perspective principle according to the on-site installation scene of the display screen. The closer the boundaries of the video content are to the real scene, the more realistic the three-dimensional effect will be for the audience. Hardware requirements and display effects of naked-eye 3D screens depend on screen hardware conditions From the perspective of hardware devices, not all outdoor LED screens are suitable for naked-eye 3D effects. The display effect of naked-eye 3D screens has high requirements for screen quality, installation precision, and creative reality materials. To present better 3D video effects, LED screens must meet at least the following three requirements. Seamless transition: The mainstream 3D large screens on the market are mainly corner screens and curved screens, and true seamless corner screens are preferred. Seamless transitions can better integrate two adjacent plane large screens, bringing a visual experience with stronger spatial sense and three-dimensionality. High-definition images: Outdoor high-definition large screens have become the direction of development, and 8K resolution and small spacing are becoming mainstream, with spacing developing from the original P16, P10, P8 to P6, P3.9, and even P2.5. The smaller the spacing, the more delicate the screen display effect, and the more realistic the 3D effect. Immersive effect: Compared with ordinary outdoor advertising screens, naked-eye 3D displays pursue more stable images and realistic colors. Excellent screen quality can present more image details and bring a more immersive visual experience. Impressive naked-eye 3D screens often have "three high" characteristics. High refresh rate: 3840Hz and higher refresh rates ensure higher image stability; High grayscale: 16bit (i.e., 65536 color changes) ensures more delicate color changes, avoiding color difference or discontinuity; High contrast: The maximum brightness of 10000nits ensures that the image remains visible under direct sunlight and presents more details and purer colors. Naked-eye 3D screen trends, domestic and foreign layout At present, naked-eye 3D is mainly distributed in the CBD business districts of some large and medium-sized cities, achieving the purpose of attracting customers for commercial entities and creating city landmarks. For cities, successfully integrating 3D content with local culture will bring huge traffic and exposure to the city, creating a popular check-in location. With the popularity of naked-eye 3D screens worldwide, overseas markets also favor naked-eye 3D outdoor large screens. Naked-eye 3D large screens can be seen in countries such as the United States, the Netherlands, the Philippines, and Thailand. Compared with traditional LED screens, naked-eye 3D screens, which have built-in hotspots and traffic, are obviously more popular with customers and advertisers. However, as more and more naked-eye 3D outdoor advertising cases appear and the screen content becomes homogenized, high-quality displays are the key to maintaining the popularity of naked-eye 3D screens, thus bringing continuous advertising benefits.

Factors Affecting the Lifespan of LED Advertising Screens LED displays have gradually appeared on the streets and alleys of cities, becoming landmarks of various shapes and sizes. However, LED displays also have a lifespan, and improper maintenance will significantly shorten their service life. So, what are the factors that determine the lifespan of LED advertising screens? Part 1. Performance of Light Source Devices LED lamp beads are key components of the display and are related to its lifespan. For LED lamp beads, the main indicators are: attenuation characteristics, waterproof and moisture-proof penetration characteristics, and UV resistance. If the manufacturer's evaluation of the performance indicators of LED lamp beads is not up to standard and they are used in displays, it will lead to a large number of quality accidents, seriously affecting the lifespan of the LED display. Therefore, it is essential to choose high-quality LED lamp beads. Part 2. Influence of Supporting Components LED displays use many other supporting components, such as: switching power supplies, circuit boards, plastic casings, connectors, and housings. Any quality problem with any component may reduce the lifespan of the screen. Therefore, the lifespan of the display is determined by the lifespan of the shortest-lived key component. Part 3. Production Process The production process of LED display products determines their fatigue resistance. Modules produced with inferior three-proof processing technology cannot guarantee fatigue resistance. When the temperature and humidity change, cracks may appear on the surface of the circuit board protection, leading to a decrease in protection performance. Therefore, the production process of LED displays is also a key factor determining their lifespan. The production processes involved in display manufacturing include: component storage and pretreatment processes, reflow soldering processes, three-proof processing processes, and waterproof sealing processes. For the vast majority of LED display manufacturers, the accumulation of experience is very important. A factory with many years of experience will have better control over the production process. Part 4. Influence of the Working Environment Due to different uses, the working conditions of displays vary greatly. In terms of the environment, indoor temperature differences are small, and there is no rain, snow, or ultraviolet radiation; outdoor temperature differences can reach 70 degrees, plus wind, sun, and rain. Harsh environments will accelerate the aging of the display, and the working environment is an important factor affecting the lifespan of the display. In addition, daily maintenance of LED displays is also very important. Regularly clean the accumulated dust on the screen to avoid affecting the heat dissipation function. The lifespan of LEDs is usually defined as the time it takes for the luminous intensity to decay to 50% of its initial value. According to statistics, the lifespan of LED displays on the market is generally 6-8 years. LED large screens that can last more than 10 years are considered very good, especially outdoor LED displays, which have a shorter lifespan. If we pay attention to these details, it will bring good results to our displays.

Nowadays, there are more and more LED products, such as LED lighting, LED brightening, transparent screens, etc., that we are familiar with. Therefore, how to distinguish the good and bad of LED displays has become a thorny issue for many users. Today, let's learn how to distinguish them together. 1. Brightness The brightness of the display screen is generally more reflected in outdoor screens, because outdoor screens are outdoors, so they have to withstand more tests. The brightness of normal outdoor full-color screens should be above 1200cd/m2-2000cd/m2. Currently, the brightness of conventional lamp beads can reach this level. 2. Balance Effect The balance effect is an important indicator of LED screens that cannot be ignored. Now most inferior manufacturers are not very clear about this indicator. In color science, when the ratio of the three primary colors of red, green and blue is 1:4.6:0.16, pure white will be displayed. If there is a slight deviation in the actual ratio, there will be a deviation in white balance. Generally, attention should be paid to whether the white is biased towards blue or yellowish green. 3. Color Reproduction The color reproduction of the display screen refers to the reproduction of the screen color, which means that the color displayed on the screen should be highly consistent with the color of the playback source, so as to ensure that the image played by the display screen is more realistic. 4. Whether There Are Dead Pixels The so-called dead pixels refer to the single points that are always bright or always dark on the screen. The number of dead pixels mainly depends on the quality of the lamp beads. Generally, using tape-type genuine lamps will not cause a large number of dead lamps. Some dead lamps are also caused by poor soldering during the bonding process. If dead pixels appear on the screen, it will greatly affect our viewing effect. Therefore, if you find any, you should solve it immediately. 5. Whether There Are Color Blocks Color blocks refer to the obvious color difference between adjacent modules. The color transition is based on the module unit. If color blocks occur, it is mostly caused by poor control system or low gray level of the screen. 6. Screen Flatness For the flatness of the display screen, this does not require professional users, because anyone with eyes can see it. The flatness of a normal display screen should be within ±1mm, so as to ensure that the image played on the screen will not be distorted. Any local protrusion or recess will cause blind spots in the viewing angle of the display screen. It is best to ensure that there are no gaps between the modules during installation. For displays below P3, this issue should be paid special attention to during assembly. If there are gaps between the modules, black lines may be seen during the playback process.

1. Attract customer attention and increase product publicity. Display screens were invented to enhance advertising effects. Therefore, choosing LED display screens can increase customer attraction, allowing customers to better understand product information. The high brightness of the display screens can better attract customers' attention to the displayed content, thus expanding product sales and further improving the company's product publicity work. 2. Can play a lighting role due to high brightness. As we all know, display screens are composed of numerous small light bulbs, so when the power is turned on, the light bulbs light up with high brightness. Therefore, LED display screens can play a lighting role at night, enhancing customer experience. The display screen's power connection and system power supply are separate and independent. Therefore, when the system is powered off, the display screen can still illuminate, increasing the brightness at night. 3. Can infinitely expand the display screen area for seamless connection. The display screen's connection interface is specially designed for seamless connection of the same type of display screens. Therefore, choosing LED display screens allows users to continuously splice and change the shape according to their needs, changing the state of small videos based on publicity requirements and the content to be publicized, thereby improving the publicity effect. Spliced display screens will not have gaps or other omissions. High-quality LED display screens can increase the publicity efforts of enterprises, improve screen usage frequency, and increase cost-effectiveness. Choosing LED display screens not only attracts customer attention and increases product publicity, but also plays a lighting role due to high brightness, improving ambient brightness at night, and can infinitely expand the display screen area for seamless connection, enhancing publicity effects.

Both conventional LED displays and transparent LED displays are types of LED displays. LED display is a general term. Conventional LED displays are called conventional because this was the earliest design of LED displays. They are the most commonly used and widely available on the market. For example, their structure, shape, control, and usage are all relatively conventional, and all components can be easily purchased without customization. Therefore, people gave them the name "conventional". Transparent LED displays have the same design principle as conventional LED displays, and they are developed based on conventional LED displays. Conventional LED displays are opaque and have a relatively thick structure, making them bulky. Transparent LED displays use a light bar design, incorporating translucent elements to optimize the overall structure and appearance. They are more aesthetically pleasing, thinner, lighter, and have better heat dissipation. In addition, with updated control systems, they are easier to control. Transparent LED displays utilize the display principle of conventional LED displays, combined with the louver structure principle. The light bars are arranged in parallel to create gaps and achieve transparency. Currently, they are mainly used in glass curtain walls, stage art design, commercial displays, and municipal engineering. The advantages and disadvantages of transparent LED displays compared to conventional LED displays are mainly reflected in product design and technology. 1. Structural Features Conventional LED displays have heavy cabinets, including cabinet frames, modules, and heat dissipation equipment. They are heavy, have a conventional appearance, and are difficult to maintain. Transparent LED displays have a simple structure, with an aluminum profile structure and a transparent PC panel, making them fashionable and beautiful. Because of their inherent light transmission, they don't require additional heat dissipation equipment and have no centralized layout of cabinet accessories. The weight is more than 50% lighter than traditional displays of the same size. 2. Display Effect Traditional displays often have poor color reproduction, distortion, and limited color adjustability. Small-pitch displays are especially prone to color mixing. Transparent displays are translucent, bright, and gorgeous, with ultra-high refresh rates making the image appear to float, creating a colorful and eye-catching effect. 3. Installation and After-sales Maintenance Traditional displays have a complex structure and are heavy, requiring steel structures for installation. Fixed wall mounting can damage the wall and pose safety hazards for outdoor installations. Later maintenance also requires specialized operations. Transparent displays, due to their transparency, can be installed indoors. The frame uses entirely active buckles, making installation convenient and easy to operate. The accessory modules are not welded but are plug-in type, with 1/4 of the modules being card-inserted. The problematic unit components can be replaced by gently pushing from the back of the module without removing the entire module, making maintenance simple and saving labor. 4. Product Specificity Traditional displays have strong resistance and can achieve an IP67 protection rating. With a soft rubber embedded layout, the minimum pitch can reach P0.8, achieving ultra-high-definition display effects. Transparent displays, due to the exposed LEDs and light bars and their lightweight nature, have a maximum IP46 protection rating. Due to the need for transparency, the minimum pitch can only reach P3, achieving only clear display effects.

Outdoor advertising is a type of advertising. Many businesses now choose outdoor advertising as a standard method. To achieve better results, outdoor LED billboards are generally installed with various lights to ensure visibility even at night. However, the installation of lighting must be reasonable, taking the surrounding environment into consideration. Only in this way can it benefit the advertiser without affecting others. Outdoor LED billboard lighting mainly refers to LED lights. Based on the size of the outdoor LED billboard: 1. "S" type sign - Billboard area exceeds 250 square meters, such as super-large advertising towers located on large rooftops and roadsides; 2. "B" type sign - Billboard area is between 21 and 249 square meters, such as medium-sized billboards on rooftops, building sides, and single-pillar billboards; 3. "P" type sign - Billboard area is between 1 and 20 square meters, such as pedestrian walkways, lamppost light boxes, telephone booths, and bus shelters. The use of outdoor LED billboards is now quite common. They are generally installed in areas with high traffic volume. When using lighting in these areas, the first consideration is whether it will cause any inconvenience to passing vehicles. Some lighting installations are unreasonable, illuminating not only the billboard but also the road surface and passing vehicles and pedestrians, creating a safety hazard. Bright lights ahead can temporarily impair vision and make it difficult to see the road conditions, increasing the risk of traffic accidents. When installing lights, it is best to illuminate from the bottom right upwards, avoiding reflection. The lights only need to illuminate the billboard; there is no need for excessive brightness. Downward illumination or scattered light is strictly prohibited. There are also requirements for the type of lights used. It is better to use lights with a yellowish color. Incandescent lights and other high-intensity lights should be avoided, and flashy lights should not be used. The use of lighting for outdoor LED billboards should not harm the interests of others, nor should it disregard other factors for the sake of profit. Reasonable planning is essential before installation.

What is a flexible LED module? A flexible module is different from a conventional LED display module. Conventional modules are made with rigid PCBs and casings, lacking flexibility. They cannot be used on curved surfaces or require special processes like cutting corners, which increases costs and compromises aesthetics. Flexible LED modules were developed to address these issues. Also known as flexible LED screens or soft LED screens, they offer high flexibility, foldability, and bendability. Flexible LED modules operate similarly to conventional LED displays, but utilize flexible PCBs and casings, resulting in exceptional flexibility and the ability to fold up to 120 degrees. Where are flexible LED modules used? 1. Curved Screens: While relatively easy to manufacture for screens with slight inward curvature by creating a curved steel structure for conventional indoor modules, those with large inward or outward curvature require flexible LED modules. 2. Cylindrical Screens: Many hotels, conference rooms, and bars use cylindrical pillars as display surfaces to enhance decor or atmosphere with special video. Flexible LED modules are ideal for this type of application, while conventional screens would be very complex. 3. Wave, Ribbon, and Other Special Shapes: Many designers incorporate wave and ribbon shapes. Flexible LED modules provide a solution that has been difficult to achieve with traditional LED display manufacturing. Flexible LED modules offer many applications, primarily using their high flexibility, foldability, and bendability. Any design idea that can leverage these features is suitable. Dongxian Electronics provides comprehensive display system solutions.

The LED display screen control card receives image display information from the computer's serial port, places it into the frame buffer, and generates the serial display data and scan control timing required for the LED display screen using a partitioned drive method. The LED display control system (LED Display Control System), also known as the LED display controller or LED display control card. LED display screens primarily display various texts, symbols, and graphics. Image display information is edited by a computer, pre-loaded into the frame buffer of the LED electronic display screen via the RS232/485 serial port, and then displayed screen by screen in a loop. The display methods are diverse, and the display screen operates offline. LED display screens are widely used in various industries due to their flexible control, ease of operation, and low cost. Several commonly used control cards are: AT-2 type control card, AT-3 type control card, AT-4 type control card, AT-42 type partition card. LED display control systems are divided into: Asynchronous LED display control system. The asynchronous LED display control system, also known as the offline LED display control system or offline card, is mainly used to display various texts, symbols, graphics, or animations. Image display information is edited by a computer, pre-loaded into the frame buffer of the LED display screen via the RS232/485 serial port, and then displayed screen by screen in a loop. The display methods are diverse and varied. Its main characteristics are: simple operation, low price, and wide range of applications. Simple asynchronous control systems for LED display screens can only display digital clocks, text, and special characters. The LED electronic display screen text and graphics asynchronous control system, in addition to the functions of the simple control system, has the greater characteristic of being able to control the screen content in zones, supporting analog clock display, countdown, images, tables, and animation display, and has functions such as timed on/off, temperature control, and humidity control. Synchronous LED display control system. The synchronous LED display control system is mainly used for real-time display of video, text and graphics, and notices, mainly for indoor or outdoor full-color LED large screens. The working method of the LED display screen controlled by the synchronous LED display control system is basically the same as that of a computer monitor. It maps the image on the computer monitor in real-time on a point-to-point basis at an update rate of at least 60 frames per second, usually with multi-gray-level color display capabilities, achieving multimedia advertising effects. Its main characteristics are: real-time, rich expressiveness, relatively complex operation, and high price. A set of synchronous LED display control systems generally consists of a sending card, a receiving card, and a DVI graphics card.

How to implement fire prevention measures for LED displays? Fire prevention technology for LED displays is closely related to fire-resistant raw materials and cabinet technology. Fire-resistant raw materials include four layers: wires and power supplies used inside the LED display, fire-resistant materials for the external safety protection structure, and plastic components. 1. In most LED display applications, the larger the display area, the higher the power consumption, and the higher the requirements for the stability of the wire's power supply. Among numerous wire products, only wires that meet national standards can ensure safety and reliability. There are three requirements: the core is a copper conductive carrier, the cross-sectional area tolerance of the core is within the standard range, and the insulation and flame retardancy of the rubber covering the core meet the standard requirements, unlike ordinary copper-clad aluminum wire cores. Wires with small core cross-sectional areas and insufficient insulation rubber grade have relatively stable power performance and are not prone to short circuits. 2. UL-certified power supply products are the best choice in the industry. Their reasonable conversion rate ensures the safety and stability of the power load and allows them to operate normally in high-temperature external environments. 3. For the materials of the external safety protection structure of LED displays, most display products with high fire resistance on the market are fire-resistant aluminum-plastic panels. They have excellent fire resistance, flame retardancy, and the core special material has strong oxygen aging performance, a melting point of 135, and a decomposition temperature of 300. They have good environmental performance, are UL94 halogen-free, and meet SGS standards. Their flame retardancy is B-S1, d0, t0. Referencing usage specifications, the aluminum-plastic panels of ordinary outdoor display products age rapidly under high temperatures and rainwater impact. In relatively humid climates, rainwater and dew easily penetrate the screen, causing short circuits and fires. 4. Among the raw materials for fire-resistant LED displays, plastic components are a key part. Plastic components are mainly used as raw materials for the unit module mask bottom shell. The key raw material is flame-retardant PC glass fiber material, which not only has flame-retardant properties but also does not deform or become brittle during high and low temperatures and long-term use, is not easily cracked, and can be directly combined with glue with good sealing performance to effectively prevent rainwater from entering the inside and causing short circuits and fires. 5. Without breakthroughs in key raw materials such as LEDs, increasing current does not improve brightness. In addition to internal raw materials affecting the actual effect of fire prevention, external configurations and designs are equally crucial. External configuration key points include fire prevention in terms of heat dissipation. When the display is working, exhaust fans and air conditioners will be configured to dissipate heat inside the screen. It is recommended to install one 1P air conditioner every 8-10 units in the square assembly line to ensure that the temperature inside the screen remains consistently normal. Improper configuration of air conditioners or exhaust fans, uneven heat dissipation, can easily lead to safety hazards due to increased temperature inside the screen body. Furthermore, many LED display companies only simply simulate environmental factors in spray waterproof testing when testing the protection level of the cabinet. The durability and strength of the actual waterproof effect need to be verified, leading to water seepage after the display product has been used for a period of time. This is also a key reason why outdoor displays are very prone to fire or have a short lifespan. To cope with the temperatures of thunderstorms, surge arresters for screen equipment are necessary to prevent lightning strikes and burning of internal components, and also to prevent lightning from entering the ground and damaging the screen. 6. Correct installation Because the electronic components of full-color LED displays are mainly made of combustible materials, to fundamentally prevent combustion, high-quality power supplies, wires, ICs, and connectors should be used.