We first have a brief understanding of the common cathode drive architecture. The industry's current LED displays, including P0.9/0.7 micro-pitch displays, mostly use the PM-mode high-scan structure, and the AM display structure has not yet been adopted. In the display panel, you can choose the industry's conventional common anode display structure, or a near The common cathode display drive technology launched in 2 years, so what is common cathode? Common cathode drive architecture? Common cathode LED display? In fact, the "common cathode" in our common "common cathode drive architecture" and "common cathode LED display" refers to the common cathode power supply method.
The common cathode power supply method is a technical solution based on the improvement of the common anode structure to achieve energy saving of the LED display. The voltage and current pass through the lamp bead and then to the negative electrode of the IC, which reduces the forward voltage drop and reduces the on-resistance.
Common cathode means 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 on-resistance becomes smaller.
The common anode is the current flowing from the PCB board to the lamp bead, which supplies power to the chip uniformly, and the forward voltage drop of the circuit becomes larger.
Common cathode, the voltage of the red chip is required to be about 2.8V, and the voltage of the blue and green chips is required to be about 3.8V. This kind of power supply can achieve accurate power supply and less power consumption, and the heat generated by the LED display during operation is relatively low. .
Common anode, under the condition of constant current, the higher the voltage, the higher the power, and the greater the power consumption is. At the same time, the LED display will also bring more heat during operation.
The common-cathode drive structure adopts precise electronic control, based on the different photoelectric characteristics of the three primary colors of LED red, green and blue, combined with the control system of the common-cathode IC and an independent private mode, to precisely assign different voltages to the LED drive circuit, so that the power consumption of the product is relatively high. Similar products are more energy-efficient and more power-saving.
The common cathode driving method can precisely control the voltage, reduce the power consumption, and reduce the heat generation. There is no wavelength drift under continuous operation, and the true color can be displayed stably.
