Screen projection method, projector and terminal device

The invention is suitable for the technical field of communication, and provides a screen projection method, a projector and terminal device, and the method comprises the steps: calculating the difference data between the N-th frame of screen image and the (N-1)-th frame of screen image of a target screen projection task when the N-th frame of screen image of the target screen projection task is obtained, wherein N is a positive integer greater than 1; performing compression processing on the difference data to obtain first compressed data; and sending the first compressed data to the terminal device, wherein the first compressed data is used for instructing the terminal device to generate a mapping image according to the first compressed data. Through the method, the projection picture can be mapped to other terminal device, so that the terminal device can accurately control the playing of the projector. 本申请适用于通信技术领域，提供了一种投屏方法、投影仪及终端设备，包括：当获取到目标投屏任务的第N帧屏幕图像，计算所述目标投屏任务的第N帧屏幕图像和第N-1帧屏幕图像之间的差异数据，其中，所述N为大于1的正整数；