The large Outdoor LED display is a high-tech engineering product integrating multi-disciplinary technologies such as electronics, power, computer, communication, information, image processing, optics, materials and structure. The relevant engineering and technical problems in any of these subject areas will affect the final operation of the entire display. A perfect LED display must be an organic combination of multidisciplinary technologies. Led display dot matrix module driver is generally completed by a constant current driver chip. The chip includes a serial shift register, serial-to-parallel conversion and constant current driving and other functional circuit components as shown in Figure 1. The constant current chip is a conversion device that converts the luminance signal of the controller into an appropriate driving current for driving the LED to emit light. The quality factor of the constant current of the constant current device will affect the effective brightness of the LED Display. Especially when the refresh rate of the display screen and the number of display gray levels are higher, the constant current chip will more significantly affect the brightness of the entire display screen. As shown in Figure 1, the supply voltage V-LED of the display will also be one of the important factors affecting the brightness, especially when the voltage is lower than the normal on-voltage of the LED, the LED illumination effect is affected, thus affecting the whole The brightness of the display. In summary, in order to solve the brightness problem in the display application, we can take practical measures including: using high-brightness chips, high light-receiving rate to select indoor rental display, and designing pre-sufficient while ensuring white balance brightness requirements. Appropriate pixel point combination design to ensure reasonable pixel viewing angle, increase the visual contrast of the display through reasonable arrangement and structure design of the lamp; select high-quality constant current driving chip for reasonable driving current And voltage design to ensure efficient driving of LEDs. Of course, ensuring efficient LED driving requires strong R&D and technical strength. The LED Video industry has grown rapidly in recent years, and has also grown up with a number of excellent display applications and display light source packaging companies, such as display light source packaging. Enterprise--Bai Shi, after years of development and growth, now has its own display R&D lab, dedicated to the research of LED display technology, and a large number of LED display application technologies in the United Nations key research institutes. research work.