A LED display (LED matrix display system, LED signage) is a flat-panel display that uses an array of light-emitting diodes as pixels for a video display. The resolution of LED displays continues to increase as pixel pitch becomes smaller to achieve better visual effects. Higher pixel density requires higher power consumption and introduces thermal issues. The traditional common-anode LED display can no longer meet the energy-saving requirements in high-resolution LED displays. In response, the industry has recently proposed a new common-cathode LED display technology suitable for high-resolution LED display.