The present disclosure discloses a display device, a display system and a control method. The display device includes a receiving module for receiving an image frame; a first decoder for decoding the image frame; the display module for performing an outputting and displaying process on decoded image data; a touch module for responding to an image display command corresponding to a touch point of a user on a touch screen; a touch point coordinate extracting module for reading a first coordinate data of the touch point of the user on the touch screen; a microcontroller for converting the first coordinate data into a second coordinate data according to a correspondence between a resolution of the display device and a resolution of the terminal device; an encoder for generating a control frame including the second coordinate data; and a transmitting module for transmitting the control frame to the terminal device.