مقدمة
With the development of science and technology and the increasing demand for LED display, LED display with small spacing has been developed rapidly, especially in high-end places. COB, IMD, SMD, and other technologies have also been developing rapidly in recent years and have made great progress. COB has gradually become the most used LED display technology and has made an enormous contribution to LED display screen development. This article takes you through the COB technology can promote the development of LED displays.
1. What is COB
The full name of COB is Chip On Board, an electrical design that focuses on simplifying the packaging mechanism of ultrafine electronic components and improving product stability. Simply put, the structure of COB packaging is to directly adhere the chip to the circuit board and cover it with specially designed resin to ensure that the external environment or human factors do not damage the chip. Because the chip is directly connected to the circuit board, simplifying many unnecessary steps, this technology can significantly improve the stability of the product.
The technology was first developed in the 1960s and is now used more on small-spaced LED displays; this special packaging technology should be able to ensure both high reliability and high protection in a very narrow space between pixels.
2. The difference between COB regular chip and flip chip
- Installation method
Their names already explain the biggest difference between the two; one is formal, and the other is flip-chip. Formal COB has an electrode and a gold wire connection; The flip-chip COB does not have an electrode, and the surface of the solid crystal is very smooth, flat, and stable, without the phenomenon of flipping. Because the flip-chip COB does not have a metal wire connection, there will be no metal migration problem, so that it will reach the level of true Micro LED.
- High definition
Small-pitch LED displays have always been the main research and development goal of LED displays in recent years. Formal COB technology is an important technology that leads the first step towards this goal. However, in recent years, research has found that due to process limitations, the emission angle and distance of formal COB have limitations; With the advent of the 5G era, there is an urgent need for higher-definition LED display screens in the market, and the birth of flip-chip COB perfectly solves this urgent need.
- Deadlight light
The dead light rate of formal COB is less than 15%; for example, a P1.25 COB LED display screen with 200000 pixels may have about 30000 unusable light beads per square meter per year. If the same LED display screen is flip-chip COB, the defect light can be controlled at less than 5% per year, which means about 10000 damaged lamp beads appear every year. This greatly improves the utilization and reliability of the LED display screen and also reduces the maintenance costs brought to users in the later stage.
3. Advantages of flip-chip COB technology
- Ultra-high reliability
The seal layer of flip-chip COB is thinner than that of formal COB, which can completely solve the problems that arise from formal COB, such as the brightness and contrast of colors. Flip-chip COB has an ultra-high contrast ratio of 20000:1, peak سطوع of 2000CD/㎡, and absolute blackness. It supports HDR digital graphics technology, allowing LED displays to be super perfect for both static and dynamic presentations.
- Ultra-high resolution and large viewing angle
With the advent of the digital age, resolutions of 4G, 5G, and 8G have all appeared in the LED display screen market. Flip-chip COB technology can easily control any دقة and is suitable for various scenarios. Its LED display screen also has a super large 180° زاوية الرؤية, allowing you to have ultra-high resolution while also having a super large viewing angle.
- Energy saving and heat dissipation
The energy-saving and heat-dissipation aspects of flip-chip COB are also very excellent. Under the same brightness conditions, the power consumption of the flip-chip can be reduced by 45%, and the screen surface temperature is 10 ° lower than others, which can better ensure the regular operation of LED display screens. It has ultra-high protection, collision resistance, shock resistance, waterproof, dustproof, smoke prevention, and anti-static capabilities, and it improves its service life.
- Simple process
Compared with formal COB technology, flip-chip COB technology is a simple process, simple operation, and simple flow 3 simple processes, but also because of these three simple, flip-chip COB in the LED display cabinet occupies a very small area, and the panel adds more space.
4. The future of flip-chip COB
With the wide use of small-pitch LED displays as the most appropriate technology: Flip-chip COB technology will be widely used. Consumer demand for point spacing and sharpness in LED displays will only grow, and as the most advanced Micro LED, flip-chip COB can handle P0.9 or even smaller point spacing better. Therefore, in the future, flip-chip COB will develop rapidly and become the ultimate development direction of LED displays.
خاتمة
Flip-chip COB technology is an emerging technology for the future; in the long term, its luminous effect and numerous advantages are also constantly driving it into the mainstream of LED display technology.
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