Patent ID: 7649506

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 whose correspondence to each of said plurality of image-display devices and a displaying order of said screen data to be displayed on said plurality of image-display devices are predetermined; a transmission-data-generating unit selecting specific screen data from among the set of the screen data by following the correspondence and the displaying order, and generating transmission data that each of said plurality of image-display devices is to display based on the selected specific screen data; a bus interface connected to said plurality of image-display devices through the bus cable; and a transmission unit transmitting the transmission data from said bus interface through the bus cable to each of said plurality of image-display devices, 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.