In the LED display industry, LED and COB LED both packaging technology has been very mature, what is the difference between the two in terms of performance, durability, service life and so on? Today I will take you to reveal the mystery between them!
LED Definition
LED is the abbreviation of light-emitting diode commonly used in the display technology industry, the LED chip is independently mounted on the carrier board, so that the LED has great flexibility, each LED can be independent light.
COB LED Definition
COB LED is multiple LED chips directly pasted on the PCB board, this paste can form a more dense LED display. COB LED display often have ultra-high pixel density, for viewers to achieve a higher smoothness and clarity of the display screen, making it popular in the field of LED display.
What are the advantages of LED?
LED chips are small, can also be self-illuminated, and in terms of brightness display can be achieved 800–5500 nits. LED IC chips are also independently packaged, more convenient in the maintenance of the later period, strengthened in terms of protection performance, can be applied to indoor and outdoor survival environment.
What are the advantages of COB LED?
COB has fewer components, so that it produces low heat when working, which can effectively extend the life of the LED display. The lumen output of COB LED can produce more light and evenly distributed;
COB LED can also realize tighter splicing, eliminating the common gaps between the LED chips, so that the COB LED display has a higher pixel density, so you can get a clearer image picture when watching. At the same time, the high pixel density also gives a wider viewing angle and so on.
What is the difference between LED and COB LED?
Structural Surface
From the structure of the surface to make a comparison, the difference between LED and COB LED is very obvious, the gap between the LED chip will be relatively large, while the COB LED display is very dense, LED in the brightness of the requirements will be higher, the LED chip only three LED lamp beads, and independently packaged, the LED structure of the surface appears orange-yellow.
COB LED substrate can be added to a large extent more LED chip integration, and the use of resin or phosphor layer, so it is difficult to see the gap between them; COB LED surface coated with phosphor to make it look like a raw egg yolk; when the use of phosphor-coated COB LEDs are energized, it will emit a more uniform light.
Manufacturing Process
LED involves a number of assembly steps, the first LED chip fixed in the bracket wall, in the way through the solder LED chip fixed on the PCB board.
COB LED components are relatively simple, there are two contacts next to the chip, respectively, the anode and cathode power supply connecting line, and the use of soldering technology will be the COB chip soldered to the PCB board, for a number of times to arrange, you can get a super-high pixel density of LED display.
Protection
LED can be used indoors or outdoors, the protection level is usually in IP44 and IP65, so that the LED has a high level of dustproof, waterproof, anti-collision, etc., so that the LED can be in the extreme rainy day can still work normally, and so on.
For COB LED, it adopts the chip packaging technology, the surface also uses the solder way to fix it in the PCB board, COB LED surface also poured some glue, can have a stronger anti-collision function, so that it can be in the transportation or installation process, to avoid the LED display beads fall or dead phenomenon and so on.
Color accuracy
LED display LED chip in the field of color reproduction are very good performance, color reproduction is higher, can more accurately restore a variety of colors, so that the LED display screen effect is more realistic.
COB LED has higher color rendering than LED because of its high pixel density and higher display resolution. For LED, in order to achieve a more consistent brightness and color display, special calibration technology is used to screen the LED chips, thus ensuring that each LED bead gets consistent and there is no obvious color difference.
Packaging technology
The main purpose of LED lamp bead packaging is to effectively protect the LED chip, so as to improve the protection, durability and service life of the LED display, etc. LED packaging technology is diversified, with a variety of encapsulation technology, such as surface mount, on-board adhesive, LED chip packaging, double-row in-line, etc. SMD is a common LED packaging technology;
SMD is a common LED packaging technology, this technology is mature and stable, low cost and good heat dissipation; COB packaging technology is more than one LED chip directly pasted to the PCB board, which has a minimal size, the work will not send out too much heat, commonly used in indoor LED display.
Brightness
Comparison between LED and COB LED in terms of brightness, we all know that LED can be applied to outdoor, and in outdoor, the brightness needs to reach 5500 nits in order to display normally in the strong sunlight, and COB LED chip size is small, can not send out such a strong brightness, but COB LED can send out a more uniform light;
So LED is more suitable for outdoor, such as outdoor LED billboards, transportation hubs, building screens and so on, which need viewers to watch from a long distance, otherwise the light emitted is too high, which will be too harsh and lead to pain in the eyes.
Even though COB LED is not as bright as LED, it is a perfect presence in its field. By installing COB LED displays indoors, the viewers can watch it from a close distance, and also can be viewed from many different locations, such as conference rooms, large lecture halls, poster screens, and so on.
Durability
LED and COB LED have outstanding durability; LED surface mounting is fixed by soldering, so there is no need to worry about the phenomenon that the lamp beads will suddenly fall off, it is solid and durable; after that, coupled with a specific protective treatment, even if it is installed in the outdoors, it will not reduce the service life;
and COB LED is a number of chips are integrated in a substrate, which can be directly owned by a tight LED chip as a protective wall. A tightly packed LED chip serves as a protective wall, making it more robust and stable, thus improving the overall durability.
Lifespan
The average service life of LED display is usually more than 100,000 hours, according to 24 hours a day, the service life of an LED display can be as long as 11 years, so LED display is very worthwhile to invest in a kind of lighting display.
However, its service life depends on its protection performance and post maintenance work. For LED and COB LED, we have learned that they have a high degree of protection and durability, but it is important to note that it must be used properly to avoid rapid decay of your LED display or collision caused by the beads fall off and wear and tear.
Energy efficiency
The energy efficiency of LED technology is one of the most prominent differences between LED technology and other LED technology, LED display technology are pursued, without the need to reduce the brightness of the premise, to achieve the lowest possible energy consumption; therefore, have more energy-efficient LED display is the LED display field of the pursuit of the same.
Comparing LED and COB LED, LED has higher energy efficiency, because LED technology meets the modern green and low-carbon consumer demand, and also helps to reduce energy consumption and environmental pollution, etc., and COB consumes more energy than LED, but it reduces the specific heat dissipation device, and does not need more power to drive the heat dissipation system, so in this regard, COB LED has higher energy efficiency.
Heat dissipation effect
COB LED design structure is relatively simple and compact, there is no specific device heat dissipation performance, but its chip does not produce too much heat energy in the work, but in some cases, COB LED chip is too dense, which leads to the local heat can not be quickly dissipated, you can use advanced external heat sinks to eliminate the thermal energy of the COB LED internal device, such as indoor air conditioning, fans etc.
LED has an independent heat sink, can be normal heat dissipation, LED chip there is a certain gap between the airflow through can also be effective for heat dissipation; but in the outdoor high-temperature environment, LED or need a specific cooling system to eliminate the heat generated by the work of the display and the sun after the LED display surface heat.
Maintenance
LED gap is larger, its protective performance in some aspects will not be too high, so need a specific protective device as protection, LED chip maintenance is convenient, you can repair a single LED chip, to continue to use the LED module. COB LED’s overall protection performance is excellent, in the face of dust or dirt can be used to gently use a soft towel or dampened cloth to wipe the surface.
Applications
In different fields, even if it is LED or COB LED, they have their own advantages, and have a strong position in their respective fields of specialization, LED display whether indoor or outdoor, can be adjusted to adapt to the brightness of different areas, such as software control, light sensor control.
Comparing LED and COB LED indoors, LED is suitable for LED displays in the competition business, because LED has the right brightness, even if it is viewed from a distance, you can clearly see the details of the performance of the game; while COB LED is used for LED displays in the competition business, and its ultra-high pixel density allows the display to have a smoother and clearer picture, and you can also clearly see every frame of the important sports posture and so on.
Costs
LED in the total cost, has a super high cost-effectiveness, and LED technology is very mature, many LED display manufacturers will produce LED technology display, whether it is the total price of the purchase or in the late maintenance costs, LED can have a better cost-effectiveness; for COB LED, because it is then complex manufacturing process, so its purchase price will be higher.
Summarize
This article has taken you through the differences between LEDs and COB LEDs. In general, LED can be applied to indoor or outdoor, and the cost is low; COB LED is commonly used in indoor environments, with ultra-high resolution and wide viewing angle, but at the same time it has a higher cost; in fact, the difference between them will not be very big, choose the most suitable for their own is the best.
