After years of development, LED display screens have formed a stable industrial chain, driving the popularity of LED displays.
However, they also have the disadvantages of excessive screen temperature and excessive power consumption. After the emergence of common cathode LED display power supply technology, it attracted great attention from the market.
We compare the conventional LED display (common anode display) with the common cathode cold screen to let everyone know more about the common cathode cold screen.
What is a common cathode cold screen?
Refers to the common cathode power supply method. The common cathode cold screen uses common cathode lamp beads, and R and GB are powered separately.
"Cathode" is the negative electrode, which is opposite to the anode (positive electrode).
The current passes through the lamp bead and then to the negative electrode of the IC.
What is a common anode display?
The common anode displays current flows from the PCB board to the lamp beads, and the RGB lamp beads are uniformly powered.
What is the difference between a common cathode/common anode LED display?
The power supply direction is different:
the current of the common anode LED display flows from the PCB board to the lamp bead, and the RGB lamp beads are uniformly powered, which increases the forward voltage drop of the circuit;
the current of the common cathode LED display first passes through the lamp bead and then to the negative electrode of the IC. The voltage drops and the conduction internal resistance is small.
The power supply voltage is different:
Common anode LED displays usually give red, green, and blue lamp beads a voltage higher than 3.8V (for example, 5V unified power supply, which causes large power loss; common cathode LED displays use red, green, and blue lamp beads based on the same voltage).
The actual voltage required by the chip (the red lamp bead voltage requires about 2.5V, and the blue and green lamp bead voltage requires about 3.8V) are accurately supplied separately, resulting in less power loss and much less heat generated during the operation of the LED display.
What are the characteristics of the common anode display screen?
Common cathode cooling screen lower heat
The special common cathode power supply method of the cold screen makes the LED display generate less heat and reduces the temperature rise during operation.
Under normal circumstances, in the white balance state and when playing videos, the cold screen temperature is about 20°C lower than the conventional outdoor LED display of the same model!
For products with the same specifications and brightness, the screen temperature of the common cathode LED display is more than 20 degrees lower than that of conventional common anode LED display products, and the power consumption is 50% lower than that of conventional common anode LED display products. above.
Realistic and more stable colours:
The common cathode drive 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 and a stable display of true colours.
Shared cooling screen saves money
The advantages of the common cathode cooling screen are that the temperature rise of the common cathode cooling screen is low, the heat of the screen body is uniform, the color temperature is constant, there are no colour patches after long-term use, and the picture display effect is good.
Maximise energy consumption while ensuring high brightness and high contrast.
A separate and precise power supply allows the LED display to reduce part of the power loss and reduce operating costs.
At the same time, the working characteristics of low heat and low-temperature rise can eliminate the need for cooling equipment such as air conditioners and reduce investment costs.
iSEMC outdoor common-cathode cold screens have the advantages of low-temperature rise, low heat, low power consumption, long life, and good display effects, and are expected to become the new favourite for outdoor display applications.
Improved screen 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 more effectively extends the system's life.
The meaning of common cathode and common anode:
The smallest unit of an LED display is a light-emitting diode. Light-emitting diodes distinguish between positive and negative electrodes, conducting forward and blocking in reverse. Common cathode means the cathodes of light-emitting diodes are connected, and common anode means the anodes of light-emitting diodes are connected.
Final Thought
Common cathode LED display market development:
At present, the mainstream LED displays in the market adopt the common anode power supply method. With the improvement of living standards and the strengthening of the concept of green environmental protection, our energy-saving requirements for LED displays are getting higher and higher. LED display manufacturers have also followed the trend of the times and launched more common cathode energy-saving LED display products.
