Abstract: A display apparatus, a display system and a method for setting color scheme are provided. The display system comprises a host and a display apparatus. The host comprises a first storage unit and a processing unit. The display apparatus used for displaying a graphical user interface (GUI) comprises a second storage unit and a display control unit. An application program and a color scheme service program are stored in the first storage unit. The processing unit executes the application program for generating a GUI, and executes the color scheme service program for outputting a coordinate parameter according to the GUI. A color scheme selector program is stored in the second storage unit. The display control unit executes the color scheme selector program for setting a color scheme of the GUI according to the coordinate parameter and a color scheme parameter.

Abstract: A method that hides data inside video signals and transmits the video signals to a display device, the method includes detecting whether a signature signal is attached to a window frame, picking the signature signal from the window frame when detecting the signature signal is attached to the window frame, generating a control signal according to the signature signal, and acting correspondingly on the display device according to the control signal.