Nov. 12, 2020< Back to list
What is COB?
COB: is the abbreviation of Chip On Board. Means: Chip-on-board packaging technology; that is, a semiconductor packaging process in which the chip is adhered to the interconnect substrate with conductive or non-conductive glue, and then wire-bonded to achieve its electrical connection. In brief, the light-emitting chip is directly mounted on the PCB board without the need for brackets and solder feet. Compared with the traditional SMD approach, COB packaging omits the two major processes of making LED chips into lamp beads and reflow soldering. Basically, the chip is directly assembled to the PCB without the limitation of the size of the packaged device, and a smaller dot pitch arrangement can be realized.
SMD packaging technology
SMD: It is the abbreviation of Surface Mounted Devices, which means: surface mount device, which is one of SMT (Surface Mount Technology) components. At present, indoor full-color LED screens mainly adopt surface-mount three-in-one SMD, which refers to the packaging technology of encapsulating SMT lamps with three different colors of RGB LED chips in the same gel at a certain interval to form a display module.
The main process is to encapsulate the LED light-emitting chip in the bracket to form lamp beads (SMD surface mount parts), and the lamp beads are then attached to the PCB board through soldering. Then put the surface mount parts and PCB board in a high-temperature oven for sintering and solidification (reflow soldering), and then use the pressure welding technology to solder the LEDs, and then encapsulate the bracket with epoxy resin to form a display mold. Finally, the modules are spliced into unit cabinets.
LED screen features of COB technology:
1.Compactness due to the small size of chip
2.High-Intensity, particularly at close distances
3.High-Uniformity, even at close working distances
4.Superior Thermal Performance for increased life, stability and reliability
5. Super "stability": almost no failure and no dead spots.
6. No "dazzling": use surface light sources instead of "dazzling" point light sources and other environmental protection technologies. Brightness is soft, and it can protect our eyes.
7. Not "squeaky": not afraid of bumps, can be wiped with water.
8. No "splicing": precision displays of different scales can be "customized".
9. long lifespan: over 1000,000 hours
10. “Great future": It will replace DLP, LCD, plasma, projection, movie screen, SMD LED display and other display products.
The other big advantage of using COB LED technology lies in the fact that COB devices have only 1 circuit and 2 contacts for the entire chip regardless of the number of diodes. This single circuit design, regardless of the number of diodes on the chip, leads to simplicity for the rest of LED device.
Why are COB LEDs so important when running on battery power?
When designing a battery-powered lighting system, there has always been a trade-off between the amount of high-quality lumen output (i.e. brightness) and length of runtime via battery operation. Historically, the more high-quality brightness desired, the shorter the runtime (assuming you are using the same size battery). However, with the recent development of COB LED technology, this tradeoff has become much less of an issue. For the first time, very low wattage COB LEDs can output extremely high-quality, ultra-bright light. As a result, a relatively small and lightweight lithium-ion battery pack can power a COB LED based light system for very long periods of time. High quality light output over extended periods of time using a relatively small battery was simply not possible just a few short years ago! This is why COB based LED lights were the only real choice we had when designing our ultra-bright, ultra-efficient light systems. As such, Silicon Light works exclusively uses COB LED technology in its full line of trade show exhibit lighting.
In summary, chip-on-board LEDs are the latest and most advanced technology on the market today. Simply saying, COB LEDs are brighter, consume less power, and output a higher quality beam of light compared to older LED technologies found in most other trade show lighting today.
In the future, the mainstream display technology is micro-pitch Micro-LED. In theory, the pixel pitch can be infinitely small. It is a COB package-based fine-pitch display technology.