The Switching Mode Power Supply (SMPS) in the display is a key component that provides a stable voltage and current to the display device. Unlike traditional linear power supplies, switching mode power supplies control the conversion and distribution of electrical energy through high-frequency switching elements (such as transistors), which can more efficiently convert alternating current (AC) to direct current (DC) while reducing energy loss. The main characteristics of switching mode power supply are high efficiency, small size and light weight. It controls the output voltage and current by adjusting the switching frequency and working time of the switching elements to meet the different power needs of the display screen. For modern display technologies such as liquid crystal display (LCD) and organic light-emitting diode display (OLED), switching mode power supplies provide accurate power stability to ensure the normal operation of the display under different brightness and color. In addition, the switching mode power supply also has overvoltage, overcurrent, overheating and other protection functions, which can effectively prevent power failure from causing damage to the display screen. As display technology continues to evolve, switch-mode power supply designs are being optimized to support higher power requirements, higher efficiency, and longer service life.