Common cathode refers to a power supply method, which is a power supply technology developed relative to the traditional common anode power supply method. The common cathode power supply technology can separate the red, green and blue lamp beads of the LED display, and supply power to them separately and accurately, so that each lamp bead can work under the best current and voltage, thus improving the utilization of electric energy rate, reducing power consumption. In addition, the current of the common cathode power supply mode first passes through the LED lamp bead and then to the negative electrode of the driver IC, which reduces the forward voltage drop and further reduces the loss of electric energy during the circulation process.
It can be seen that LED displays using common cathode technology can indeed reduce power consumption, but how much can the power consumption be reduced? How does the 75% energy saving of common cathode technology come from?
In fact, not all LED displays can reduce the power consumption to 75% after adopting the common cathode technology, and the actual power consumption reduction should be in the range of 30%-75%. This article compares the conventional P10 aluminum module LED display with the top configuration common cathode P10 aluminum module LED display. The maximum power consumption of the conventional standard P10 aluminum module LED display is 900W/m², the average power consumption is 300W/m², and the white balance brightness is 6000cd/m²; the maximum power consumption of the common cathode top configuration P10 aluminum module LED display is 350W/m², the average power consumption is 118W/m², and the brightness is 9500cd/m²; we use the average power consumption to calculate, |(118W/m²-300W/m²)/300W/m²|=60.67%, which means that a total of The power consumption of the top configuration version P10 aluminum module LED display is 60.67% lower than that of the conventional standard P10 aluminum module LED display.
Generally speaking, the higher the brightness of the LED display screen of the same specification, the higher the power consumption should be, but the common cathode technology has changed this result. Here, we convert the brightness of the common cathode top configuration P10 aluminum module (9500cd/m²) into the same brightness as the conventional standard P10 aluminum module LED display (6000cd/m²), and then compare their power consumption. For the common cathode top configuration P10 aluminum module LED display, when its brightness is 9500cd/m², the average power consumption is 118W/m²; then, when its brightness is also 6000cd/m², the average power consumption should be 74.53W /m² [(6000*118)/9500=74.53], in the same way, it can be calculated that when the brightness is 6000cd/m², the maximum power consumption is 223.59W/m². Therefore, we still use the average power consumption to calculate: |(74.5W/m²-300W/m²)/300W/m²|=75.16%, which means that under the same brightness (6000cd/m²), the common cathode top configuration The power consumption of the P10 LED display is 75.16% lower than that of the conventional standard LED display.
It should be noted here that the above conversions are all based on mathematical calculations, and in the actual operation or adjustment process, they will also be affected by factors such as current, voltage, and resistance. But this does not affect the conclusion we have demonstrated: the common cathode technology makes the energy saving effect of the LED display screen up to 75%.
