I believe we are not particularly unfamiliar with LED displays. We have seen a lot of them in our daily life. So do you know what types of LED displays belong to, and where do these strange names come from? Let us find out together.At present, the classification methods of LED display screens mainly include the following:
1. Divided by display parts
LED digital display:
The display device is a 7-segment digital tube, which cannot display too much content. Only some relatively simple electronic displays such as clock screens and interest rate screens can be made to display numbers.
LED dot matrix graphic display:
The display device is a dot matrix display module composed of many evenly arranged light-emitting diodes, so it can play digital media information such as text and images.
2. According to the use environment
indoor:
The area of the indoor screen is generally less than ten square meters, and the distance between the display screens used indoors is relatively close, so the distance between the points is small and the density is high. When used in non-direct sunlight or lighting environments, the viewing distance is a few meters away, and the screen body is not It has the ability of sealing and waterproofing. The diameter of the light-emitting point is small, generally 1.25-6mm in diameter, and the brightness is 800-2000cd per square meter.
outdoor:
The outdoor screen area is generally from a few square meters to dozens or even hundreds of square meters, the density between points is much larger (mostly 1000-4000 points per square meter), and the luminous brightness is 3000-6000cd per square meter (different orientations, Brightness requirements are different). This luminous brightness can be used normally even in direct sunlight. The viewing distance is as little as ten meters or as many as tens of meters. Moreover, the screen has good wind and rain resistance and lightning protection capabilities. Outdoor The center diameter of the light-emitting point of the screen is larger, such as P5mm, P6mm, P8mm, P10mm, P16mm, etc.
Semi-outdoor:
The semi-outdoor display screen is between indoor and outdoor, has high luminous brightness, can be used outdoors without direct sunlight, and the screen body has a certain degree of sealing. Such products have some characteristics indoor and outdoor, so use The occasion of the display is also special, usually under the eaves or in the window. The diameter of the light-emitting point of the semi-outdoor display is relatively moderate, and the area is not very large. The commonly used ones are P2.5mm, P3mm, P4mm, etc.
3. According to the control method
Synchronization (or communication) method:
It means that the working mode of the LED display is basically the same as that of the computer monitor. It maps the image on the computer monitor correspondingly in real time at an update rate of at least 30 fields/s. Multimedia advertising effect.
Asynchronous way:
It means that the LED screen has the ability to store and automatic playback. The edited text and non-grayscale pictures on the PC are transmitted to the LED screen through the serial port or other network interfaces, and then automatically played offline by the LED screen. Generally, there is no multi-grayscale display. Ability, mainly used to display text information, can be multi-screen networking.
4. According to the common name of the industry
This is also a relatively common classification method, which generally includes the following:
4.1, Small pitch display or fine pitch display
The characteristics of the small-pitch LED display are that the dot pitch of the screen is small, and the resolution per unit area is high. It can display higher-definition graphics images and videos, as well as more channels of video and image images, especially in the application of image splicing, which can achieve seamless and arbitrarily large-area splicing. In the industry, it generally refers to indoor LED display screens with LED point spacing of P2.5 and below, mainly including P2.5, P2.083, P1.923, P1.8, P1.667, P1.5, P1.25, P1.0 and other LED display products.
With the improvement of LED display manufacturing technology, the resolution of traditional LED display has been greatly improved. Which is better, small pitch LED display or DLP rear projection display? Many people will naturally think of DLP rear-projection displays when they see small-pitch LED displays. Indeed, most of the indoor mid-to-high-end display market is dominated by DLP rear-projection displays, but DLP technology has natural defects.
The 1mm gap between display units that cannot be eliminated can eat up at least one display pixel. Secondly, it is also inferior to the direct-emitting LED display in terms of color expression. In particular, due to the differences between DLP display units, it is difficult to control the uniformity of color and brightness of the entire display screen.
Seams are hard to keep consistent and will become more and more noticeable. The color difference between the units and the adjustment of the seam, even if it is maintained and repaired in the later stage, is a more difficult thing. The biggest competitiveness of indoor high-density small-pitch LED display is that the display is completely seamless and the display color is natural and true.
At the same time, in terms of post-maintenance, the LED display screen already has a mature point-by-point correction technology. The display screen that has been used for more than one or two years can use the instrument to perform one-time correction of the entire screen.
The operation process is simple and the effect is also very good.Therefore, if the two are evaluated from the perspective of display quality, it must be that the high-density small-pitch LED display is better than the DLP rear projection, but the smaller the dot pitch above the price, the higher the density of the small-pitch display The higher the price.
Which one you choose depends on your financial strength. By the way, although many products on the market are called small spacing, in the industry, the prices of products with the same specification and small spacing produced by different technologies are also very different. Let’s talk about SMD packaging technology and COB packaging technology. From the perspective of the industrial chain distribution of COB small-pitch LED display technology, it includes the midstream packaging and downstream display application industries of the LED industry. In contrast, it has a very high technical threshold.
Compared with SMD discrete device LED small-pitch display technology, COB small-pitch LED integrated display technology has very obvious technical advantages, which are mainly reflected in the following aspects.
(1) Smaller point spacing can be achieved at present, the small-pitch LED display technology of SMD discrete devices, the mainstream dot pitch is between P1.2-P2.0, it is very difficult to continue to reduce the dot pitch, mainly subject to two factors:The first factor is that mature SMD devices are 1010 and 0808 specifications. For example, P1.2 discrete devices are small-pitch LED displays, and 0808 specifications are generally used. Smaller size SMD devices, such as 0606 or 0505 specifications, are currently less mature;The second influencing factor is that discrete devices must undergo SMT reflow soldering. Due to the smaller size of SMD devices, means that there are smaller pads, which affects the yield of SMT reflow soldering, and the SMD devices after reflow soldering are also very fragile. It is easy to be knocked off, and the protection is very fragile.COB small-pitch LED display technology does not have the above-mentioned problems of SMD discrete device LED display technology. The size of the dot pitch that can be achieved is only limited by the packaging technology. Therefore, JYLED’s COB small-pitch LED display technology can usually achieve P0. 5-P2.0 dot pitch, the minimum dot pitch can reach P0.5, which can achieve the market below P1.0 where discrete device LED small pitch technology is difficult to mass-produce.
(2) It can provide the strongest protection compared with the fragile protection performance of the small-pitch LED display technology of SMD discrete devices, the protection performance of the COB small-pitch LED display technology is powerful.SMD discrete device small-pitch LED display technologyThe above picture shows the small-pitch LED display technology of SMD discrete devices. The LED chips are solidified and soldered on the bracket and then encapsulated with epoxy resin to form an SMD device. Through SMT reflow soldering, the SMD device is soldered on the PCB board. Because the small-pitch LED display technology of discrete devices uses SMD devices with specifications of 1010 or 0808, and the size of the pads is very small, after SMT reflow soldering, it is prone to false soldering and being knocked off, and the protective performance is fragile.COB Small Pitch LED Display TechnologyThe above picture shows the COB small-pitch LED display technology. The LED chips are solidified and soldered on the PCB board, and then directly packaged on the PCB board with packaging glue. The encapsulation glue and the PCB board have a strong bonding force, and the LED will not be damaged under the action of external force, and the anti-collision ability of external force is outstanding. Therefore, the small-pitch LED display technology of COB package has very good protection ability.
(3) Provide higher reliability and stability SMD discrete device LED small-pitch display technology, there is a failure rate of 30-50PPM in the production process, through the aging and maintenance before leaving the factory, to ensure that there is no dead light when leaving the factory. However, in the process of customer use, there is still a high failure rate.COB small-pitch LED display technology can provide higher reliability and stability, and the failure rate during customer use will be significantly reduced.The main factors that cause the failure of LED display screens include external environmental factors and reliability factors of LED packaging.
When the temperature, humidity, pollution, vibration, etc. of the external environment exceed the range that the LED display can withstand, or when the threshold of the LED display design against external environmental factors is too low, it will cause the LED display to fail, especially for small spacing. LED displays are more sensitive to external environmental factors and more prone to failure;The reliability of LED packaging is mainly determined by the packaging reliability of LED chips, brackets, gold wires, packaging glue and other materials. To ensure the overall reliability of LED packaging, it is necessary to design the thermal matching and mechanical matching of various materials.Compared with ordinary SMD device packaging, COB packaging eliminates the LED bracket and the link of connecting the PCB board by solder paste through SMT reflow soldering.
In COB packaging, the LED chips are directly bonded and soldered on the PCB board, and the LED chips are directly packaged on the PCB board with packaging glue. Therefore, the COB package has higher reliability.COB packaging and SMD device packaging COB small-pitch display technology is an innovative technology that combines LED packaging and LED display. It has very obvious technical advantages, but correspondingly, the small-pitch COB package is far more expensive than the small-pitch package of SMD devices.
4.2, Rental display
LED rental display
It is a LED display specially used for stage performances and cultural activities. Generally, it appears in the form of rental, so it is named LED rental screen, which generally has the following three characteristics.The LED rental display screen uses a unique die-casting aluminum cabinet, which is light in weight, thin in structure, and has the functions of hoisting and quick installation.Easy to assemble and disassemble, easy to operate, the whole screen is fastened and connected by fast bolts, and the screen can be installed and disassembled accurately and quickly, and different shapes can be assembled to meet the site requirements;The unique structural design of welding process optimization avoids the failure scene caused by poor contact of electronic product solder joints caused by frequent handling;Since the LED rental display can be used as a large category, there are also many bright and bright features. The following are the common features of the LED rental display:
- ★Lightweight, ultra-thin, and quick installation design enables you to complete the installation and disassembly of the display in a short time;
- ★Support the arbitrary direction of the signal line to meet the arrangement and placement of different cabinets to create pictures with different effects;
- ★Equipped with a professional video processor, supporting AV, DP, VGA, DVI, YPBPR, HDMI, SDI and other signals;
- ★Support 256-level brightness adjustment and white balance custom adjustment, so that different batches of displays can be mixed;
- ★Signal processing: RTF series products adopt signal folding technology, and the unit modules do not need to be cascaded, which greatly improves the display performance of the product. Using the signal folding technology, the unit modules do not need to be cascaded, which greatly improves the display performance of the product;
- ★Mask: It adopts a patented technology mask, and the mask adopts the rear snap-fastening assembly method, which can facilitate the front maintenance of the LED lights, the fastening screws are not visible on the front of the mask, the integrity of the screen surface is good, and there are no screws when the screen is lit. Bright spots caused by light leakage;
- ★Module: Large module is adopted, each cabinet has only 4 modules, which reduces the internal connection and improves the product stability. The display module can be disassembled and installed directly from the rear of the cabinet without opening the cabinet. The display module can be directly disassembled from the rear of the cabinet without opening the cabinet;
- ★Back cover: Remove 4 screws and remove the back cover to maintain and replace the power supply and receiving card;
- ★Heat dissipation plate: The aluminum bottom plate is used to replace the traditional plastic bottom shell, which improves the heat dissipation performance of the product while ensuring flatness;
- ★IC and driver: High refresh rate, high grayscale, high refresh rate, high grayscale 16384-level grayscale products use high-end constant current driver chips with built-in PWM. In the case of single receiving card loading, the display refresh rate can be as low as 960HZ and as high as 4800HZ. The gray level can reach up to 16bit, and the picture is stable, which can easily meet the requirements of high-end applications such as stage performance and broadcast. The DC power cord adopts American standard wire, and the power input adopts the surface mount socket, the power cord is not easy to loosen, the line loss is minimal during the power transmission process, and the input voltage is stable;
- ★Capacity: The new structure design meets the requirements of hoisting and stacking, and meets the requirements of indoor and outdoor. The cabinet is single, compatible with various point distances, and compatible with indoor and outdoor modules;
- ★High: High grayscale and high refresh rate design, grayscale level 14 bit, refresh rate >960Hz;
- ★Low: excellent heat dissipation design and heat dissipation performance, no need for external fans, air conditioners, etc., low noise; the light weight of the cabinet, low installation cost; low power consumption of the cabinet, saving operating costs;
- ★Good waterproof effect, with IP65 protection level, suitable for outdoor rental use;
- ★Equipped with air boxes of various specifications, which is convenient for storage and transportation of the cabinet, and have a good protection effect on the LED display.
- ★According to customer requirements and on-site environment, tailor-made the most suitable LED display rental solutions;
4.3, transparent display
LED transparent display screen is a new LED product in China after 2010. In the beginning, the transparent display only refers to the LED transparent glass display, because other types of transparent screens have not yet appeared. Until 2017, some manufacturers tried to hollow out the light board of the traditional LED display to achieve 50% of the light. After the transparency, the LED transparent display screen also officially appeared in people\’s field of vision. People call this grille-like transparent display screen an LED transparent screen or an LED grille screen. For the LED transparent display industry, it is easy to confuse “transparent LED display” with “transparent LED glass display” for those who don’t know much about it. In fact, these two displays are completely different products.
The LED transparent display is to make the LED display partially transparent. From the original opacity, the LED display is optimized to be transparent when viewed from certain angles, reducing the occlusion of the light board and structure to people’s sight. , you can see the scene behind the display. Therefore, the content to be played is made three-dimensional, making people feel like an object suspended in the air, and it is also convenient for people to observe the objects behind the screen, which is of great value for window advertising. There are two specific implementation methods of LED transparent display in the industry at present: method one, by adding a hollow design to traditional LED display, and then matching new patch, drive circuit, control system and new module structure to realize LED display Optimized innovation for transparent displays. Method 2: It is formed by splicing light bars, with a special structure and signal processing method.
Some of them use LED lamp beads to emit light from the side, so that the LED transparent display screen can be viewed from the front, and the side area of the light bar that blocks the line of sight is less and more transparent. The front-illuminated LED transparent display is not as transparent as the side-illuminated display. However, when viewed from above or below, the transparency is better than that of the light-emitting module (the display screen is viewed from different angles, and the occlusion area is different).
In contrast, LED glass screens are custom-made optoelectronic glass that glues the LED structural layer between two layers of glass. According to the application requirements, the LEDs can be designed into various arrangements such as stars, matrices, text, patterns, patterns and so on. Not only is the light-emitting principle and method of the LED glass screen different from that of the LED transparent screen, but the maintenance cost is also much higher.
The LED transparent screen is improved on the basis of LED modules after all, so it can still be replaced locally The damaged module restores the screen to normal, so the maintenance cost is much lower. However, if the LED glass screen fails, the entire screen often needs to be removed together, so the maintenance cost is very high.
4.4, floor tile display
The LED display is mainly composed of LED modules, and there are many small lights on the LED modules. If they are accidentally damaged, it will affect the display effect of the entire screen. But there is such a display, Not only is not afraid of bumps, but also can jump on them. This is: LED floor tile screenThe floor tile screen can not only be placed on the ground but also can be stepped on at will. What’s going on? It turns out that the LED floor tile screen is a display device specially applied to the ground. It adopts a video synchronization control method to achieve a high-resolution soft color effect, and the light source uses ultra-bright semiconductor light-emitting diodes. The high-strength mask and the sturdy aluminum alloy bracket are used on the upper body, so that it can be stepped on at will.
Features:
High stability, good load-bearing, wear-resistant and slippery, waterproof, moisture-proof, easy maintenance, good heat dissipation, high brightness, gorgeous color, realistic effect.Structural characteristics of floor tile screen
- Cabinet material: Aluminum alloy is used as the bracket, which is light in weight, convenient in maintenance, heavy in bearing capacity and beautiful in appearance.
- The PCB circuit board adopts a perforated design, which is convenient for the connection between the face-bearing column of the kit and the bottom bottom case, and the PCB and lamp beads are fixed inside to prevent damage.
- Control system: It adopts a system with LED display screen and has a storage function.
- Using high-performance thermal conductive silica gel, the light board PCB is closely connected to the kit, waterproof and moisture-proof.
- Use the aviation head to connect the signal line and power line between the cabinet and the cabinet, which looks simple, stable in signal and high in reliability.
- The cabinet is made of aluminum alloy, which has good heat dissipation and no noise.
- Support high-resolution display, good display effect and more realistic color.
- Seamless stitching, good display effect. The above classification methods have basically covered most of the products. As for the naming method, there are many and varied names. Let\’s take a look.
1. Named by location
There are many different names for this.The installation on the ceiling is called sky screen,The installation on the bus is called the bus screen, installed on the floor is called floor tile screen, if the floor and ceiling are installed together, it is called tunnel screen, The device installed in the car is called the car screen,The roof screen installed on the roof is called a roof screen.
2. Name by place of use
The installation on the stage is called the stage display screen, because most of them use rental, so it is also called the stage rental display screen. The device installed on the signal light is called a traffic screen, which is usually used to display traffic signs.
The light pole screen installed on the light pole is called the light pole screen, because it is mainly used on the street, so it is also called the street light pole screen
The door screen installed at the head of the store
Installed in a bar or KTV, it is called a DJ screen because the shape used is like a horn, so it is also called a DJ horn screen
3. Name by shape
Shaped like a ball is called: a spherical LED screen
The shape of a cube is called: a cubic screen or Rubik’s cube screen
The shape like a cylinder is called: a cylindrical screen
The one shaped like a tunnel is called: Tunnel Screen
Shaped like a backpack, the one that can be carried on the body is called: a backpack screen
