Small-pitch LED display refers to indoor LED display with LED point spacing of P2.5 and below, including P2.5, P2.083, P1.923, P1.8, P1.667, P1.5, P1. 25, P1.0 and other LED display products. The small pitch LED is characterized by a small dot pitch and a high resolution per unit area. It can display higher definition graphic images and videos, as well as display more video and image images, especially in image stitching, which can be seamless and arbitrarily large-area stitching.