After years of development, the traditional common anode LED display has formed a stable industrial chain, which has led to the popularization of LED display. However, it also has drawbacks, excessive screen temperature and excessive power consumption. After the appearance of common cathode LED display power 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 power supply technology of the common cathode LED display? What are the advantages of this technology?
What are the advantages of the power supply technology of ordinary cathode LED display
1. What is a normal cathode LED display?
“Common cathode” refers to the common cathode power supply method. In fact, this is an energy-saving technology for LED displays. Refers to using a common cathode to power an LED display. B (red, green, blue) separates the power supply, and accurately distributes the current and voltage of the R, G, B lamp beads, because the R, G, B (red, green, blue) lamp beads need the best working voltage, and the current is different, Therefore, the current will first pass through the lamp bead, and then reach the negative pole of the IC, reducing the forward voltage drop and reducing the conduction internal resistance.
2. What is the difference between common cathode and common anode LED displays?
①. Different power supply methods:
The commonly used cathode power supply method is that the current first passes through the lamp bead and then reaches the negative pole of the integrated circuit, so that the forward voltage drop becomes smaller and the on-resistance becomes smaller.
The common anode is the current flowing from the PCB board to the lamp beads, and evenly supplies power to R, G, B (red, green, blue), so that the forward voltage drop of the circuit becomes larger.
②. The power supply voltage is different:
Common cathode, supply current and voltage for R, G, B (red, green, blue), respectively. Red, green and blue LEDs have different voltage requirements. The voltage of the red lamp beads is about 2.8V, and the voltage of the blue and green lamp beads is about 3.8V, this power supply can achieve precise power supply and power supply. Due to the smaller losses, the heat generated by the LED display during operation is much lower.
The common cathode needs to give R, G, B (red, green, blue) a unified power supply higher than 3.8V (such as 5V). At this time, the voltage obtained by red, green and blue is uniform 5V, while red, green, The optimal working voltage required by the three blue lamp beads is much lower than 5V. According to the power formula P=UI, under constant current conditions, the higher the voltage, the greater the power, that is, the greater the power consumption, while the LED display is working More heat is generated in the process.
3. Why is the heat of ordinary cathode LED display lower?
The special common cathode power supply mode of the cold screen makes the LED display process generate less heat and lower temperature rise. Under normal circumstances, during white balance and video playback, the temperature of the cold screen is about 20°C lower than that of the traditional outdoor LED display of the same model. Under the same specifications and the same brightness, the screen temperature of ordinary cathode LED display is more than 20 degrees lower than that of ordinary anode LED display products, and the power consumption is 50% lower than that of ordinary anode LED display products.
The high temperature of the LED display screen and the excessive power consumption have always been the key factors affecting the service life of the LED display screen. “Common cathode LED display” can solve these two problems.
4. What are the advantages of ordinary cathode LED displays?
e power supply really saves energy:
Ordinary cathode products adopt precise power control technology, according to the different optoelectronic characteristics of the three primary colors of LED red, green and blue, combined with intelligent IC display control system and independent dedicated mode, the different voltages of LED and driving circuit are accurately allocated, so that the power consumption of the product is relatively high. Similar products in the market save about 40%!
②. Real energy saving brings real color:
The commonly used cathode LED driving method can precisely control the voltage, while reducing power consumption and heat generation, the wavelength of the LED will not drift during continuous operation, and the true color can be displayed stably!
③. Real energy saving brings longevity:
The energy consumption is reduced, the temperature rise of the system is greatly reduced, the probability of LED damage is effectively reduced, the stability and reliability of the entire display system are improved, and the service life of the system is greatly extended.
5. What are the trends in common negative technologies?
Related to common cathode LED display technologies such as LEDs, power supplies, and driver ICs, it is not as mature as the Ram LED industry chain. In addition, the current common cathode IC series is incomplete, and the overall sales volume is not large. Ram still occupies 80% of the market.
The main reason for the slow development of common cathode technology at present is the high production cost. On the basis of the original supply chain collaboration, the common cathode requires customized collaboration at all ends of the industrial chain such as chips, packaging, and PCBs, and the cost is high.
In this era of extremely high demand for energy saving, the emergence of the common negative transparent LED display has become the support point of this industry’s pursuit. However, there is still a long way to go to achieve comprehensive promotion and application in a larger sense, and the joint efforts of the entire industry are required. Ordinary cathode LED display involves the use of electrical energy and operating costs, which is the development trend of energy saving. Therefore, energy saving and consumption reduction are related to the interests of LED display operators and the use of national energy.
Judging from the current situation, the ordinary cathode LED energy-saving display will not increase the cost too much compared with the traditional display, and it will also save costs in future use, which is well received by the market.
Post time: Aug-06-2022
