Analysis of LED Common Cathode Technology
First, what is LED common cathode cold screen technology?
"Common cathode" refers to the common cathode power supply method. It is actually an energy-saving technology for LED displays. It refers to using a common cathode method to power the LED display, that is, using the R, G, B (red, green, and blue) are powered separately, and the current and voltage are accurately allocated to the R, G, and B lamp beads respectively, because the R, G, and B (red, green, and blue) lamp beads require the best working voltage and current. They are different. In this way, 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.
Second, what is the difference between common cathode and common anode?
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 electrode of the IC, so that the forward voltage drop becomes smaller and the conduction internal resistance also becomes smaller.
The common anode is the current flowing from the PCB board to the lamp bead, providing unified power supply to R, G, and B (red, green, and blue), which causes the forward voltage drop of the circuit to increase.
Because the three basic colors of lamp beads require different voltages when they work normally. Therefore, common cathode technology can accurately provide the required voltage for each type of lamp bead. For example, red lamp beads only require 2.8V, while blue and green require 3.8V. Therefore, the voltage can be accurately provided through different power supply anodes. In order to prevent voltage drop, the common anode must use more than the required voltage to achieve normal results, resulting in a waste of power and thermal effects. As shown below.
1. Accurate power supply and true 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 a smart C display control system and an independent private mode to accurately allocate different voltages to the LED and drive circuit, making the product power consumption relatively Similar products on the market save about 40% of electricity!
2. True energy saving brings true color
The common cathode LED driving method can accurately control the voltage, which not only reduces power consumption, but also reduces heat generation. There is no wavelength drift under continuous operation of the LED, and stable display of true colors!
3. True energy saving brings long life
The energy consumption is reduced, which greatly reduces the temperature rise of the system, effectively reduces the probability of LED damage, improves the stability and reliability of the entire display system, and greatly extends the life of the system.
In this era when people are clamoring for energy conservation, the emergence of common cathode LED displays has understandably 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 larger sense. This requires the joint efforts of the entire industry. As an energy-saving development trend, LED common cathode display screens involve various uses and operating costs, so energy saving is related to the interests of LED display operators and the use of national energy.
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