Abstract: An information transmission method is utilized in a wireless display system and the wireless display system includes a source terminal and a sink terminal establishing a wireless connection with each other. The information transmission method includes the sink terminal receiving and displaying frame information transmitted from the source terminal by a data channel and obtaining an operation information; the sink terminal generating a control information according to the operation information and transmitting the control information to the source terminal by a user input back channel; the source terminal performing a command in the control information to output a result information; and the source terminal determining whether to adjust the result information to a display information with a smaller amount of information according to a transmission setting corresponding to the command in the control information and transmitting the display information to the sink terminal by the data channel.

Abstract: An electronic device includes a display unit; a memory unit; and a processing unit electrically connected to the display unit and the memory unit, the processing unit capturing (N+M) frames displayed by the display unit, N and M being positive integers, the N frames having a first resolution, the M frames having a second resolution, the first resolution being larger than the second resolution, the processing unit converting a color space of the (N+M) frames and encoding the (N+M) frames, the processing unit magnifying a size of each of the M frames to be equal to a size of each of the N frames, the processing unit encapsulating and outputting the (N+M) frames.