Patent ID: 8558757

Claim:
A display system comprising: a display unit, including a microprocessor, having an interface unit to perform bi-directional communication, an image display unit to show an image, a signal processor to convert an image signal inputted through the interface unit to a signal being displayed by the display unit, the microprocessor to output display information of controllable functions of the image display unit and the signal processor through the interface unit to an external controller; and the external controller connected to the interface unit and directly providing, in response to a request by the display unit, a graphic user interface corresponding to the display information for the display unit such that the graphic user interface is displayed on the image display unit, and having a display controller to output control instructions to the microprocessor through the interface unit that allows the microprocessor to control at least one of the image display unit and the signal processor according to a setting through the displayed graphic user interface, wherein a first button in the graphic user interface, which is configured to execute a first function which is controlled by the image display unit or the signal processor is activated, and wherein a second button in the graphic user interface is disabled, the second button being configured to execute a second function which is not controlled by the image display unit and the signal processor, wherein the external controller to provide the graphic user interface to the display unit is not controlled via the graphic user interface, but the display unit to receive the graphic user interface from the external controller is controlled via the graphic user interface, and wherein the display information comprises activated information of a microprocessor changeable service menu and an image display state.