Patent ID: 6970145

Claim:
An image-transmitting device connected to a plurality of image display devices through a bus cable, said image-transmitting device comprising: a memory unit storing a set of screen data, each individual of said set of screen data corresponding to one of said plurality of image-display devices, said memory unit further storing a displaying order of said individual of said set of screen data to be displayed on said corresponding image-display devices; a transmission-data-generating unit selecting specific screen data from among the set of the screen data by following the correspondence between each individual of said set of screen data and respective of said image display devices and the displaying order, and generating transmission data that each of said image-display devices is to display based on the selected specific screen data; a bus interface connected to said image-display devices through the bus cable; a transmission unit transmitting the transmission data from said bus interface through the bus cable to each of said image-display devices; and an instruction-input unit that is used by a user to select one of the screen data and one of said image-display devices through a graphical user interface (GUI), and to direct the selected image-display device to display the selected screen data, wherein the transmission data is generated based on the selected screen data by said transmission-data-generating unit, and then is transmitted to the selected image-display device by said transmission unit, wherein said transmission data includes data of a first data type for an entire screen and area updating data of a second data type different from the first data type for updating part of the entire screen, the area updating data including data specifying an updating area of the screen data displayed on an image-display device and data used for updating part of the screen data displayed in the updating area.