Shenzhen Lianchengfa Technology Co., Ltd.

Today's LED display field is like a Romance of the Three Kingdoms, with swords, swords, and bloody winds. The three packaging modes stand on each other. Who is strong and who is weak, who can finally rule the world? Don't worry about the officials, and listen to LCF editor Slowly talk about the pros and cons of the three encapsulation modes, and you can draw a pretty close conclusion yourself.

1. DIP display

DIP package is the abbreviation of dual inline-pin package, commonly known as plug-in display. It is the first to be developed among the three encapsulation modes. The lamp beads are produced by LED lamp bead packaging manufacturers, and then inserted into the LED PCB lamp board by LED module and display manufacturers, and DIP semi-outdoor modules and outdoor waterproof modules are produced through wave soldering. In the early stage, three colors of red, green and blue lights were inserted on the PCB to form an RGB pixel point. In the later stage, three kinds of RGB chips can be packaged in one lamp bead, that is, a three-in-one outdoor display screen, which is relatively improved. production efficiency and production cost. However, no matter whether it is a single-lamp RGB or a three-in-one RGB, the dot pitch is limited by the diameter of the lamp bead. At present, it can only achieve P6, and it is difficult to achieve a higher-density outdoor display. The protective performance is good, but the viewing angle is not easy to fix accurately, generally between 100-110, so it is suitable for outdoor large-pitch display.

At present, it seems that the production organization of DIP display is relatively complicated, it is not easy to implement mechanized production, and the production efficiency is low. The quality of the display screen is subject to the quality of the lamp beads in the lamp bad packaging factory. It is difficult to control each batch, so the quality is not stable. In addition, there are many DIP manufacturers without high technical and equipment thresholds. The competition is fierce. Many manufacturers use inferior raw materials and PC boards to reduce costs to gain market share. The quality is low and there is almost no perfect after-sales guarantee.

DIP roducts are relatively rough in appearance, the viewing angle is only 100-110 degrees, the quality is not high, the energy consumption is high, it is not environmentally friendly, and the price is low. At present, it can still occupy a strong market share in the outdoor P20-P8 market.

2. SMD isplay

SMD package is the abbreviation of Surface Mounted Devices, which means: surface mount device, which is one of the SMT (Surface Mount Technology Chinese: surface mount technology) components. "In the early stages of electronic circuit board production, via assembly was done entirely manually. After the first batch of automated machines were introduced, they could place some simple pin components, but complex components still required manual placement for wave soldering. Surface Mount Components was introduced about two decades ago and a new era has started. From passive components to active components and integrated circuits, all eventually become Surface Mount Devices (SMD) and can be handled by pick and place equipment. Assembly. For a long time, people thought that all lead components could eventually be packaged in SMD. SMD technology is widely used in LED displays.

Three-in-one is a kind of SMD technology of LED display, which means that the SMT lamps packaged with RGB LED chips in three different colors are packaged in the same colloid at a certain distance. Full-color LED display using three-in-one SMD technology The viewing angle of the whole screen is larger than that of DIP, and the surface can be treated with light diffuse reflection, the effect obtained is not grainy, and the color uniformity is good. In terms of color, the three-in-one full-color spectroscopic color separation is easier than the three-in-one, and the color saturation is high. The three-in-one uses the entire surface to emit light, so the overall color of the three-in-one is more uniform. The three-in-one overall flatness is easier to control. Has been the standard technology used in high-definition LED display.

In the early stage of development, due to the complicated manufacturing process and difficult maintenance, the cost is very high, and it is generally used in high-end LED display products. In recent years, due to the rapid development of three-in-one technology and the continuous improvement of production technology, a large number of automatic equipment is used, SMD has developed rapidly, and the cost has been reduced a lot. It is currently the mainstream product of LED indoor displays. And it has begun to penetrate into the outdoor display market, but the brightness and outdoor waterproof, moisture-proof, dust-proof, anti-static, and anti-oxidation have always been an insurmountable gap.

3. cob display

COB packaging, short for Chip on board, is a new packaging method that is different from DIP and SMD packaging technologies. Wei Qiaoshun Optoelectronics pioneered this technology in the field of LED display, and after years of technical practice, it is the only manufacturer that has truly mastered this technology and made its products serialized and mass-produced. We have hundreds of derivative products based on COB patented technology. The key to the patented technology of Wei Qiaoshun Optoelectronics lies in the integration of COB packaging + lamp driver.

Compared with the previous dot matrix module, DIP and SMD, Wei Qiaoshun's COB display has the following significant advantages

1. Ultra-light and thin: According to the actual needs of customers, PCB boards with a thickness of 0.4-1.2mm can be used to reduce the weight to at least 1/3 of the original traditional products, which can significantly reduce structural, transportation and engineering costs for customers.

2. Anti-collision and anti-pressure: COB products directly encapsulate the LED chip in the concave lamp position of the PCB board, and then encapsulate and cure it with epoxy resin glue. The surface of the lamp point is convex into a spherical surface, smooth and hard, and resistant to impact grind. Even if there are dead pixels, COB products can be repaired point by point, and the maintenance is very simple.

3. Large viewing angle: For traditional LED displays, firstly, the LED chip is at the bottom of the light cup, forming a certain drop between the cup mouth and the cup mouth. Secondly, the position accuracy error of the packaged light during the placement process, and the unevenness of the locking mask, etc. There are three reasons, resulting in reduced viewing angle and uneven viewing angle. The viewing angle of DIP is 100-110 degrees, the viewing angle of SMD is 120-140 degrees, and the COB package adopts shallow well spherical light emitting, the viewing angle is greater than 175 degrees, close to 180 degrees, and has better optical diffuse color than SMD. Effect.

4. Bending: Bending ability is a unique characteristic of COB packaging. The bending of PCB will not damage the packaged LED chip, while the bending of SMD PCB may cause the chip pins to be desoldered. Therefore, the use of COB modules can easily make LED curved screens, circular screens, and wavy screens. It is an ideal base material for personalized molding screens in bars and nightclubs. It can be spliced seamlessly, the production structure is simple, and the price is much lower than that of LED special-shaped screens made of flexible circuit boards and traditional display modules. The cylindrical bending capacity of the high-density P4 series modules can reach a diameter of 50cm, which is an ideal base material for the selection of cylindrical media in airports, stations, and shopping malls.

5. Strong heat dissipation ability: SMD and DIP products mainly dissipate heat through colloid, lamp legs or solder pads. The heat dissipation area is small, and the heat will be concentrated on the chip, which will cause serious light attenuation phenomenon or even dead light phenomenon for a long time, reducing the display screen life and quality. The COB product is to package the lamp on the PCB board, and the heat of the wick is quickly transmitted through the copper foil on the PCB board, and the thickness of the copper foil on our PCB board has strict process requirements, plus the immersion gold process, the PCB board The price is 2 times of the same specification of SMD and DIP. This is why our COB products feel hotter to the touch, which means that the heat is easily dissipated and hardly causes serious light attenuation. So there are few dead lights, which greatly prolongs the life of the LED display. In terms of structural design, Wei Qiaoshun Optoelectronics also uses aluminum pallets to replace the traditional SMD and DIP plastic brackets, plus some auxiliary and effective heat dissipation methods to quickly discharge heat.

6. High stability: The high reliability of Weiqiao Shunguang's COB products is reflected in the fact that the dead pixel rate of the module has been controlled at <5/100000, which is much higher than the national standard. There are the following points to ensure that it is not difficult for us to achieve this standard, or even better.

A. Production process: There are many processing techniques for traditional LED displays, especially in the process of reflow soldering, the expansion coefficients of SMD lamp bead brackets and epoxy resin are different under high temperature conditions, which can easily cause the bracket and epoxy resin The package shell falls off, gaps appear, and the phenomenon of dead lights gradually appears in the later use, resulting in a high defect rate. The reason why the COB technology display is more stable is because there is no reflow soldering lamp in the processing technology. Even if there is a later reflow soldering IC process, the diode chip has been cured and protected with epoxy resin glue, which avoids There is a gap between the lamp bead bracket and the epoxy resin caused by high temperature soldering in the welding machine, so our COB products are not prone to dead lights after leaving the factory.

B. Use high-end manufacturing equipment: We use the most advanced ASM automatic welding equipment.

C. Strict quality control throughout the process:

D. Wei Qiaoshun's business philosophy: We transform the cost reduction by using advanced production technology into providing customers with the highest quality raw materials. For example, our PCB boards use immersion gold technology, and the price is twice that of traditional modules of the same specification. Usually we use bigger chips and better ICs, and we use better heat dissipation materials in structure.

7. Advantages of six defenses: waterproof, moisture-proof, dust-proof, anti-static, anti-oxidation, and anti-ultraviolet are the weaknesses of SMD products, but they are indeed the strengths of Wei Qiaoshun products. The pads of the lamp pins of the traditional LED display are exposed, and short circuits between the pads of the lamp pins are prone to occur when exposed to water or damp; the masks used are uneven and difficult to clean when they are stained with dust; the alloy wires and iron brackets used are easily damaged Oxidation; the exposed lamp pin pads are easily affected by static electricity, resulting in dead lights. The COB protects the chip with epoxy resin, without exposed lamp pins, and can play waterproof, dustproof, antistatic and other functions. When exposed to water, just wipe it off with a cloth. Outdoor modules are not afraid of water at all, and have no effect on the screen. After a period of use, the dust on the screen can be wiped directly with a rag, and the dust can be cleaned directly from the smooth surface. In addition, Wei Qiaoshun COB module adopts the circuit board of immersion gold process, and special treatment process, which can resist oxidation and ultraviolet rays. The COB module of Wei Qiaoshun Optoelectronics can work normally at a low temperature of minus 30 degrees and a high temperature of minus 80 degrees.

8. Energy saving and high brightness: At present, SMD competition is fierce, and small-chip LED surface mount lights are generally used. The load of the light is high during normal use, and the brightness cannot be increased. The brightness attenuation coefficient is large. After a period of use, the consistency will lose Significantly worse. The COB products of Wei Qiaoshun Optoelectronics adopt large-chip light-emitting diodes, which can effectively increase the brightness, and have uniform heat dissipation, small brightness attenuation coefficient, and better consistency after long-term use. On the premise of emitting the same brightness, COB has less heat and is more energy-saving.

The only disadvantage of COB packaging is that the ink color of the screen is not easy to control, so God is fair. While giving COB all the benefits, it still chooses a problem that makes COB a headache; but this will not affect the COB display at work. Excellent performance. Thankfully we've found a way to improve ink.

At present, the products of Wei Qiaoshun Optoelectronics have entered the COB outdoor high-density high-brightness full-color range. Compared with traditional products, our product cost performance has absolute advantages. At the same time, we have unique advantages in indoor and outdoor LED special-shaped screens and creative shape screens. In terms of display engineering modules, it can completely outperform dot matrix module unit boards, and in terms of indoor full-color screens, it has the advantage of surpassing SMD quality. It has absolute advantages in indoor and outdoor ultra-thin and ultra-thin double-sided screens.

Therefore, the development in the next few years will still be an era of heroes. Due to backward products and poor quality, manufacturers will not make profits, and the dot matrix module will gradually fade out of the market. In the field of outdoor displays, the P20-P10 market is still dominated by DIP, but the market share is gradually shrinking due to outdated product technology, and the P8-P6 will be the mainstream development market. The world is divided between SMD and COB. In the outdoor P5-P4 high-density high-brightness full-color market, COB will dominate. In terms of low-end full-color indoor screens, SMD has a place. At this time, due to fierce competition, SMD may have the same destination as dot matrix modules. In terms of indoor high-end small pitch, COB products will have an absolute advantage. In terms of indoor and outdoor special-shaped screens and creative shape screens, COB products have absolute advantages.

Therefore, the future is an era in which quality is king, efficiency is king, function is king, and service is king.

Do a lot of quantity, but the price is very low, there is no benefit, no quality, no differentiation, and you will die miserably!

The above is the introduction knowledge of the advantages and disadvantages and development trends of the LED display DIP, SMD, and COB packages compiled by the editor of Liancheng. I hope it will be helpful to everyone. At the same time, you are welcome to add or correct. LCF is a national-level professional and new "little giant" enterprise, a LED display application and solution provider integrating "hardware + software + content + interaction". The main business covers four major sections: "Smart City", "Cultural Tourism Commercial Performance", "Commercial Display Engineering", and "Content Technology". It has the world's leading automated production equipment, modern post-doctoral research laboratories and comprehensive sales and services. team. Friends who need to buy LED display，pleas contact us. LCF LED display manufacturer, a big country brand, trustworthy!

Source: Gaogong LED