What is LED display common cathode technology

After years of development, conventional common anode LED display screens have formed a stable industrial chain, driving the popularity of LED display screens, but there are also disadvantages such as high screen temperature and excessive power consumption. After the emergence of common cathode LED display power supply technology, it has attracted great attention from 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 display?

"Common cathode" refers to the common cathode power supply method, which is actually an energy-saving technology for LED displays. B (red, green, blue) is powered separately, and the current and voltage are accurately distributed to R, G, and B lamp beads, because R, G, B (red, green, blue) lamp beads require the best working voltage and The current is different, so the current will first pass through the lamp bead 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/common anode LED displays?

①. The power supply method is different:

The common cathode power supply method is that the current passes through the lamp bead first, and then to the negative electrode of the IC, so that the forward voltage drop becomes smaller and the conduction internal resistance becomes smaller.

The common anode is that the current flows from the PCB board to the lamp beads, and uniformly supplies power to R, G, and B (red, green, and blue), which leads to a larger forward voltage drop of the circuit.

②. The power supply voltage is different:

Common cathode, it will provide current and voltage to R, G, B (red, green, blue) separately. Red, green, and blue lamp beads have different voltage requirements. The voltage requirement of red lamp beads is about 2.8V, and the voltage requirement of blue and green lamp beads is about 3.8V. This kind of power supply can achieve accurate power supply and less power consumption. , The heat generated by the LED display during work is much lower.

The common anode is to give a uniform power supply to R, G, B (red, green, blue) with a voltage higher than 3.8V (such as 5V). At this time, the voltage obtained by red, green, and blue is uniform 5V. However, the optimal working voltage required by the three lamp beads of red, green and blue 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 work.

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 the temperature rise during the working process. Under normal circumstances, the temperature of the cold screen is about 20 ℃ lower than that of the conventional outdoor LED display screen 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, and the power consumption is 50% lower than that of the conventional common anode LED display. above.

High body temperature and excessive power consumption of LED display screens 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 common cathode LED display?

①. Precise power supply and real energy saving:

Common cathode products adopt precise power supply control technology. Based on the different photoelectric characteristics of LED red, green and blue primary colors, it is equipped with an intelligent IC display control system and an independent private model to precisely distribute different voltages for LEDs and drive circuits, so that the power consumption of the product is relatively low. Similar products in the market save about 40% of electricity!

②. True energy brings true color:

Common-cathode LED drive mode can precisely control the voltage, while reducing power consumption, it also reduces heat generation. The wavelength of the LED does not drift under continuous operation, and the true color can be displayed stably!

③. True energy 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?

The supporting products related to common-cathode LED display technology, such as LED, power supply, driver IC, etc., are not yet as mature as the common-yang LED industry chain. In addition, the current series of common-cathode ICs are not complete, and the overall volume is not large, while common-yang still accounts for 80%. market.

The main reason for the slow advancement of common cathode technology is the high production cost. Based on the original supply chain collaboration relationship, common cathode requires customized cooperation at all ends of the industrial chain such as chips, packages, and PCBs, and the cost is relatively high.

In this era of high demand for energy saving, the emergence of a common cathode transparent LED display has undoubtedly become the support point for this industry to pursue. 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 the development trend of energy saving, the common cathode LED display 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 screen will not increase the cost much compared with the conventional display screen, and it will save costs in the later use, which is highly praised by the market.