With the improvement of people’s living standards, the SMD LED technology produced by the display screen gradually can not meet the high demand for display effect and product quality, for this reason, the market has a COB LED technology produced by the display screen. So, what are the special features of COB LED technology, let’s take a look at it.
The working principle of COB LED
COB LED technology is a number of LED chips through the conductive adhesive or solid crystal adhesive, directly bonded to a single substrate or printed circuit board (PCB), and then finally use encapsulation materials, such as epoxy resin, silicone, etc., to fill the gap between the chip and the substrate or the printed circuit board, and curing to form a layer of protection, which can effectively protect the LED chip.
What is COB LED technology?
COB LED technology, known as Chip on Board Light Emitting Diode technology, is an innovative display technology in the field of LED technology.
It can improve the shortcomings of the previous LED display technology and further improve the quality of the image, so as to meet the requirements of people for higher display effect and product quality.
Advantages of COB LED
Superior Pixel Pitch
With COB LED technology, the center distance between pixels can be less than 1mm. The smaller the pixel pitch of a COB LED display, the clearer the details and color variations of the picture can be displayed, which can bring viewers a high-definition, detailed and realistic picture, and make viewers satisfied with the level of detail and clarity of the picture.
Excellent display effect
Surface light source is a unique advantage of COB LED display. The surface light source can reduce the refraction of light, thus preventing the appearance of moiré, and make the displayed picture more clear and natural, which can effectively relieve the audience’s eyes from fatigue after watching the screen for a long time.
High Energy Efficiency
COB LED display uses flip chip cob technology. This technology can realize the light emitting without blocking, can reduce the energy consumption under the same brightness, to improve the overall energy efficiency, and the transparency of its coating can also improve the energy efficiency.
The energy consumption of COB LED display is in line with the requirements of the global sustainable development, so as to be environmentally friendly.
High durability
Through the above working principle, we can know that the surface of the LED chip will be protected by epoxy resin or silicone resin, and this kind of protective layer can provide good waterproof, dustproof and collision-proof function for COB LED display.
And the use of welding points will be reduced in manufacturing, so that the COB LED display can have better thermal performance, thus improving the overall durability.
Longer life
The LED chips in the COB LED display are protected by resin, and its robust design enables the COB LED display to have a longer lifespan.
Suitable for all environments
The robust design and precise packaging technology can provide COB LED display with better adaptability, which can maintain the original performance and display effect in shopping malls, conference rooms and other indoor areas, and greatly satisfy people’s high demand for product quality.
Comparison between COB LED and SMD LED
Packaging Technology
The package design of SMD LED display is not the same as the package technology of COB LED display, SMD LED display adopts surface mount technology (SMT), which will make the LED beads exposed.
COB LED display’s encapsulation technology adopts COB technology, which wraps the LED lamp beads completely, so its anti-collision ability is a bit stronger.
Brightness
The brightness of COB LED and SMD LED depends on the lumen output of the LED chip.
The brightness of the COB LED display is generally higher than 80 lumens/watt, while the brightness of the SMD LED display will be in the range of 50~80 lumens/watt.
Comparing the lumens of both, it can be concluded that the brightness of the COB LED display will be higher than that of the SMD LED display.
Color Temperature
Depending on the technology, COB LED displays and SMD LED displays have different color temperature performance. For SMD LED displays, the SMD technology brings more options in terms of color and color temperature to the display.
Since three different primary colors can be used, it is easier to make adjustments for warm and cool color drops. For COB LED displays, on the other hand, its ability to change the color and color temperature is limited, and it is not possible to make adjustments for warm and cool tones.
Pixel Pitch
The pixel pitch on COB LED display is much smaller than that on SMD LED display, which is limited by packaging technology, and its dot pitch is usually more than 1mm, such as P1, P1.56, P1.875, P2.0, P3, P4, etc.
While the COB LED display is able to adjust the color and color temperature, the COB LED display is not able to adjust the color and color temperature. COB LED displays are able to achieve less than 1mm, such as P0.9, P0.6, etc.
Durability
SMD LED will cause the beads to fall off and be damaged to a certain extent when it is touched by fingers or collides with other things during the process of production, transportation and installation.
The protection of COB LED will be better, in the installation and use of the process will not occur in the case of lamp beads fall off and damage, in the transportation process, its packaging technology can also improve the resistance to collision, so that the overall stability has been greatly improved.
Optical Characteristics
SMD LEDs in the production process will cause uneven light spots. COB LED display adopts the spot gluing technology, which can paste the light-emitting chips on the same level, making the light-emitting picture more uniform.
Maintenance cost
In terms of maintenance cost, as the lamp beads on SMD LED displays are exposed, they are easily affected by the outside world, which may lead to lamp failure or damage.
On the other hand, COB LED displays adopt the whole package, which reduces the probability of failure or damage due to external factors. After testing, the dead rate of COB LED display is about 4~5 times lower than that of SMD LED display.
Energy efficiency
Energy efficiency is related to the technology and the transparent layer of the package.
SMD LED displays mainly adopt the top light-emitting technology, the lead wire will block the light, and the light transmittance of the package is relatively low, resulting in the whole energy consumption is greater, energy efficiency is lower.
COB LED displays adopt flip chip technology, and its package is more translucent, so the overall energy efficiency is higher, more environmentally friendly.
Applications of COB LED
Indoor Display
COB LEDs can show better results indoors, it has high definition, high quality images, which can be viewed at close range without blurring. It is suitable for a indoor LED video wall, conference all-in-one machine and other displays.
Commercial Display
It can be applied in shopping malls, exhibition halls, museums, etc. It can better present the content of the screen with higher clarity and fineness, which can better attract the attention of consumers and enhance the added value of the products.
Advertising Sign Boards
COB LED displays will also be involved in advertising. It can be applied to billboards, indoor large screen displays and other products in the field of commercial display.
Through the high-definition large screen display effect, deepen the audience’s impression of the broadcast content, thus deepening the consumer’s impression of the brand and further guiding consumer consumption.
Summarize
After reading this article, we know that COB LED technology can bring us better picture presentation and product quality, and has a great advantage in the field of small pitch display.
Due to the current high price of COB LED products, but with the future cost reduction, COB LED products can bring us more possibilities.
