Patent ID: 6822637
Filing Date: 2004-11-23
Classification: G06F,G09G

Abstract:
An image signal generating apparatus which transmits an image signal to a plurality of display units each having identification data, comprising:an image signal generator which sequentially generates an image signal for each frame that is an image signal for displaying one page image in one frame period, the one page image being an image to be displayed on each of the plurality of display units; an indexer which adds an index signal to the image signal for each frame; a pointer controller which controls addition or non-addition of a pointer signal to the image signal for each frame, the pointer signal being a signal for displaying a pointer on each of the plurality of display units; an image signal output circuit which sequentially transmits the image signal for each frame to the plurality of display units, thereby causing any of the plurality of display units having identification data corresponding to the index signal added to the transmitted image signal for each frame to display an image based on the transmitted image signal for each frame; and a central controller which controls the pointer controller in such a way that the pointer signal is not added to the image signal for each frame during at least one frame period from a first time point that is at least one frame period previous to a second time point at which the display unit for displaying the one page image based on a received image signal is changed by changing the index signal added to the image signal for each frame.