After years of development, conventional common anode LED has formed a stable industrial chain, driving the popularity of LED displays. However, it also has the disadvantages of high screen temperature and excessive power consumption. After the emergence of common cathode LED display power supply technology, it has attracted great attention in the LED display market. This power supply method can achieve a maximum energy saving of 75%. So what is the common cathode LED display power supply technology? What are the advantages of this technology?
1. What is a common cathode LED?
“Common cathode” refers to the common cathode power supply method, which is actually an energy-saving technology for LED display screens. It means using the common cathode method to power the LED display screen, that is, the R, G, B (red, green, blue) of the LED lamp beads are powered separately, and the current and voltage are accurately allocated to the R, G, B lamp beads respectively, because the optimal working voltage and current required by the R, G, B (red, green, blue) lamp beads are different. In this way, the current first passes through the lamp beads and then to the negative electrode of the IC, the forward voltage drop will be reduced, and the conduction internal resistance will become smaller.
2. What is the difference between common cathode and common anode LEDs?
①. Different power supply methods:
The common cathode power supply method is that the current first passes through the lamp bead and then to the negative pole of the IC, which reduces the forward voltage drop and the conduction internal resistance.
The common anode is that the current flows from the PCB board to the lamp bead, and supplies power to R, G, B (red, green, blue) uniformly, which leads to a larger forward voltage drop in the circuit.
②. Different power supply voltage:
Common cathode, it will provide current and voltage to R, G, B (red, green, blue) separately. The voltage requirements of red, green and blue lamp beads are different. The voltage requirement of red lamp beads is about 2.8V, and the voltage requirement of blue-green lamp beads is about 3.8V. Such power supply can achieve accurate power supply and less power consumption, and the heat generated by LED during work is much lower.
Common anode, on the other hand, gives R, G, B (red, green, blue) a voltage higher than 3.8V (such as 5V) for unified power supply. At this time, the voltage obtained by red, green and blue is a unified 5V, but the optimal working voltage required by the three lamp beads is much lower than 5V. According to the power formula P=UI, when the current remains unchanged, the higher the voltage, the higher the power, that is, the greater the power consumption. At the same time, the LED will also produce more heat during work.
The Global Third-Generation Outdoor LED Advertising Screen Developed by XYGLED， adopts common cathode. Compared with traditional 5V red, green, and blue light-emitting diodes, the positive pole of the red LED chip is 3.2V, while the green and blue LEDs are 4.2V, reducing power consumption by at least 30% and exhibiting excellent energy-saving and consumption-reduction performance.
3. Why does the common cathode LED display generate less heat?
The special common cathode power supply mode of the cold screen makes the LED display generate less heat and lower temperature rise during operation. Under normal circumstances, in the white balance state and when playing videos, the temperature of the cold screen is about 20℃ lower than that of the conventional outdoor LED display of the same model. For products of the same specifications and at 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 products, and the power consumption is more than 50% lower than that of the conventional common anode LED display products.
The excessive temperature and power consumption of the LED display have always been the key factors affecting the service life of LED display products, and the “common cathode LED display” can solve these two problems very well.
4. What are the advantages of the common cathode LED display?
①. Accurate power supply is really energy-saving:
The common cathode product adopts precise power supply control technology, based on the different photoelectric characteristics of the three primary colors of LED red, green and blue, and is equipped with an intelligent IC display control system and an independent private mold to accurately allocate different voltages to the LED and the drive circuit, so that the product power consumption is about 40% lower than that of similar products on the market!
②. True energy saving brings true colors:
The common cathode LED driving method can accurately control the voltage, which reduces power consumption and heat generation. The wavelength of LED does not drift under continuous operation, and the true color is stably displayed!
③. True 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 system life.
5. What is the development trend of common cathode technology?
The supporting products related to common cathode LED display technology, such as LED, power supply, driver IC, etc., are not as mature as the common anode LED industry chain. In addition, the common cathode IC series is not complete at present, and the overall volume is not large, while the common anode still occupies 80% of the market.
The main reason for the slow progress of common cathode technology is the high production cost. Based on the original supply chain collaboration, common cathode requires customized cooperation at all ends of the industry chain such as chips, packaging, PCB, etc., which is costly.
In this era of high calls for energy saving, the emergence of common cathode transparent LED display screens has become the support point pursued by this industry. However, there is still a long way to go to achieve comprehensive promotion and application in a greater sense, which requires the joint efforts of the entire industry. As a trend of energy-saving development, the common cathode LED display screen involves the use and operation costs of electricity. Therefore, energy saving is related to the interests of LED display screen operators and the use of national energy.
From the current situation, the common cathode LED energy-saving display screen will not increase the cost too much compared with the conventional display screen, and it will save costs in the later use, which is highly respected by the market.
Post time: Feb-02-2024
