After years of development, the conventional common anode LED display has formed a stable industrial chain, which has promoted the popularization of LED display. However, there are also disadvantages of excessively high screen temperature and excessive power consumption. After the emergence of the common cathode LED display power supply technology, it has attracted great attention in the LED display market. This power supply method can achieve up to 75% energy saving, so what is the power supply technology of the common cathode LED display? What are the advantages of this technology?
1. What is a common cathode LED display?
“Common cathode” refers to the common cathode power supply method. In fact, it is a kind of LED display energy-saving technology. It refers to the common cathode method to power the LED display, that is, the R, G, B (red, green, and blue) is supplied separately, and the current and voltage are accurately allocated to the R, G, and B lamp beads, because the R, G, B (red, green, and blue) lamp beads need the best working voltage and The currents are not the same, so that the current passes through the lamp beads and then to the negative electrode of the IC, the forward voltage drop will be reduced, and the internal resistance of the conduction will be reduced.
2. What is the difference between common cathode/common anode LED display?
①. Different power supply methods:
The common cathode power supply mode is that the current passes through the lamp beads and then to the negative electrode of the IC, so that the forward voltage drop and the internal resistance of the conduction are also reduced.
The common anode means that the current flows from the PCB board to the lamp beads, and supplies power to R, G, B (red, green, and blue) uniformly, which leads to a larger forward voltage drop of the circuit.
②. Different supply voltages:
Common cathode, it will separately provide current and voltage to R, G, B (red, green, blue). The red, green and blue lamp beads have different voltage requirements. The voltage of the red lamp bead is about 2.8V, and the voltage of the blue and green lamp beads is about 3.8V. This power supply can achieve accurate power supply and power With less loss, the heat generated by the LED display during work is much lower.
The common anode is to give a voltage higher than 3.8V (such as 5V) to R, G, and B (red, green, and blue) for a unified power supply. At this time, the red, green, and blue voltages are all unified 5V , But the optimal working voltage of the three lamp beads of red, green and blue is much lower than 5V. According to the power formula P=UI, when the current is constant, the higher the voltage, the higher the power. That is, the greater the power consumption, at the same time, the LED display will also produce more heat during work.
3. Why the common cathode LED display has lower heat?
The special common cathode power supply mode of the cold screen makes the LED display less heat and low temperature rise during the working process. Under normal circumstances, the temperature of the cold screen is about 20℃ lower than the conventional outdoor LED display of the same model in the white balance state and when playing video. For products with the same specifications, under the same brightness, the screen temperature of the common cathode LED display is more than 20 degrees lower than that of the conventional common anode LED display product, and the power consumption is 50% lower than that of the conventional common anode LED display product. the above.
The high temperature of the LED display screen and the excessive power consumption have always been the key factors affecting the service life of LED display products, and “common cathode LED display” can solve these two problems.
4. What are the advantages of a common cathode LED display?
①. Precise power supply is really energy saving:
Common cathode products use precise power supply control technology, based on the different photoelectric characteristics of the LED red, green and blue primary colors, equipped with a smart IC display and control system and independent private mode, to accurately allocate different voltages for the LED and the drive circuit to make the product power consumption relatively Similar products on the market save about 40% of electricity!
②. Real energy saving brings true colors:
The common cathode LED driving method can accurately control the voltage, while reducing the power consumption, it also reduces the heat generation. The LED has no wavelength drift under continuous operation and a stable display of true colors!
③． Real energy saving brings long life:
The energy consumption is reduced, thereby greatly reducing the temperature rise of the system, effectively reducing the probability of LED damage, improving the stability and reliability of the entire display system, and greatly extending the life of the system.
5. What is the development trend of common cathode technology?
Supporting the common cathode LED display technology, such as LED, power supply, driver IC, etc., is not as mature as the common anode LED industry chain. In addition, the current series of common cathode IC is not complete, and the overall amount is not large, and the common anode still accounts for 80% Market.
The current slow progress of common cathode technology is mainly due to the high production cost. Based on the original supply chain collaboration, common cathode requires customized cooperation from each end of the industrial chain such as chips, packaging, and PCB, and the cost is high.
In this era of high demand for energy saving, the emergence of the common cathode transparent LED display has become the support point of the pursuit of this industry. However, there is still a long way to go to achieve comprehensive promotion and application in a larger sense, which requires the joint efforts of the entire industry. The common cathode LED display, which is the development trend of energy saving, involves the use of electricity and operating costs. Therefore, energy saving is related to the interests of LED display operators and the use of national energy.
Judging from the current situation, the common cathode LED energy-saving display will not increase the cost too much than the conventional display, and it will save the cost in the later use, which is highly praised by the market.
Nicole Cao
WhatsApp: +86 13421325275
E-mail: nicole.cao@besd-led.com
