What Is the Common Cathode LED Display Power Supply Technology_ What Are the Advantages
1. What is a common cathode LED display?
"Common Yin" refers to the common Yin power supply mode, which is actually an energy-saving technology for LED display screen. It refers to the common Yin mode to supply power to LED display screen, that is, separate the R, G and B (red, green and blue) of LED beads to supply power, and accurately distribute current and voltage for R, G and B beads respectively, because R, G and B (red, green and blue) The best working voltage and current required by the lamp bead are different. In this way, the current first passes through the lamp bead and then to the IC negative electrode, the forward voltage drop will be reduced and the conduction internal resistance will be reduced.
2. What is the difference between common Yin / common Yang LED displays?
. different power supply modes:
The common cathode power supply mode is that the current first passes through the lamp bead and then to the IC negative electrode, so that the forward voltage drop becomes smaller and the conduction internal resistance becomes smaller.
The common positive current flows from the PCB board to the lamp beads to uniformly supply power to R, G and B (red, green and blue), which leads to the increase of the forward voltage drop of the circuit.
Common cathode, which will separately provide current and voltage to R, G and B (red, green and blue). The voltage requirements of red, green and blue light beads are different. The red light bead voltage is required to be about 2.8V and the blue-green light bead voltage is required to be about 3.8V. In this way, the power supply can achieve accurate power supply with less power consumption, and the heat generated by the LED display screen in operation is much lower.
In Gongyang, R, G and B (red, green and blue) are uniformly supplied with a voltage higher than 3.8V (such as 5V). At this time, the voltage obtained by red, green and blue is unified 5V, but the optimal working voltage required by red, green and blue beads is much lower than 5V. According to the power formula P = UI, under the condition of constant current, the higher the voltage, the higher the power, That is, the greater the power consumption, at the same time, the LED display will produce more heat during operation.
3. Why is the heat of common cathode LED display lower?
The special common cathode power supply mode of the cold screen makes the LED display screen produce less heat and low temperature rise. Under normal conditions, the temperature of the cold screen is about 20 lower than that of 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 common cathode LED display screen is more than 20 degrees lower than that of conventional common anode LED display screen products, and the power consumption is more than 50% lower than that of conventional common anode LED display screen products.
High temperature and high power consumption of LED display screen have always been the key factors affecting the service life of LED display products, and "common cathode LED display screen" can solve these two problems.
4. What are the advantages of common cathode LED display?
. accurate power supply, true energy saving:
Gongyin products adopt accurate power supply control technology. Based on the different photoelectric characteristics of the three primary colors of LED, red, green and blue, it is matched with the display and control system of intelligent IC and independent private model to accurately distribute different voltages for LED and driving circuit, so that the power consumption of the products is about 40% less than that of similar products in the market!
. true energy saving brings true color:
The common cathode LED driving mode can accurately control the voltage, reduce the power consumption and reduce the calorific value. Under the continuous operation of LED, the wavelength does not drift and stably displays the real color!
. true energy saving brings long life:
The energy consumption is reduced, which greatly reduces the temperature rise of the system, effectively reduces the LED damage probability, improves the stability and reliability of the whole display system, and greatly prolongs the service life of the system.
5. What is the development trend of common cathode technology?
The LED, power supply, drive IC and other supporting technologies related to the common cathode LED display technology are not as mature as the LED industry chain of common Yang. In addition, the current series of common cathode IC is incomplete and the overall volume is not large, while common Yang still occupies 80% of the market.
At present, the slow promotion of common cathode technology is mainly due to the high production cost. Based on the cooperation relationship of the original supply chain, common cathode needs customized cooperation at all ends of the industrial chain such as chip, packaging and PCB, and the cost is high.
In this era of high voice for energy conservation, the emergence of common Yin transparent LED display has undoubtedly become the support point pursued by this industry. However, there is still a long way to go to realize the comprehensive promotion and application in a greater sense, which requires the joint efforts of the whole industry. As the development trend of energy saving, the common cathode LED display involves the use of electricity and operation cost. Therefore, energy saving is not only related to the interests of LED display operators, but also related to the use of national energy.
From the current situation, the common cathode LED energy-saving display screen will not increase too much cost than the conventional display screen, and will save cost in later use, which is highly praised by the market.
