Patent ID: 7369131

Claim:
A multi-display system, comprising: displays which display image signals; a main memory which stores the image signals input to the multi-display system; image signal process units which are disposed corresponding to each of the displays, and process the image signals into separate formats according to each of the corresponding displays; a memory bus which transmits the image signals to/from the main memory and the image signal process units; a secondary memory which stores the processed image signals processed by the image signal process units; a secondary memory bus separately provided from the memory bus which transmits processed image signals to/from the secondary memory and the image signal process units; and a controller which controls the image signal process units to display the image signals stored in the main memory rather than the secondary memory on each of the corresponding displays, wherein the controller controls the image signal process units to display the processed image signals stored in the secondary memory on some of the displays in response to overloading of the image signals on the memory bus where the image signals are displayed on at least two of the displays, wherein each of the image signal process units comprises; an interpolation unit which interpolates a standardization frequency ratio of video data of the image signals; a scaler which enlarges and scales down graphic data of the image signals and the video data that is interpolated; a RGB converter which converts the video data that is enlarged and scaled into RGB data; and an overlay which compounds the graphic data that is enlarged and scaled with the RGB data.