Split image display control unit

Claim 1

A control unit for a display device having a display screen partitioned into a plurality of areas in the form of blocks for displaying a plurality of split images each consisting of one or more blocks, comprising: block detection means for detecting one of said blocks in which a scanning location on the display screen is contained, including column split memory means for storing lateral block split positions on the display screen, line split memory means for storing longitudinal block split positions on the display screen, position information generation means for generating position information indicating the scanning position on the display screen, said block designation means for comparing the position information with the contents of said column split memory means and said line split memory means, respectively, and for generating a block designation signal to designate the block in which the scanning position is contained; a display data memory for storing data to be displayed; conversion means responsive to said block detection means for producing split image signals each indicating the split image to which the detected block belongs; and address control means responsive to the split image signals for generating a read address for said display data memory for each split image; said display data memory being accessed by the read address.