Graphic display device with pattern shifting means

G - Physics – 06 – F

Patent

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375/15

G06F 3/153 (2006.01) G09G 3/00 (2006.01)

Patent

CA 1048181

ABSTRACT Display devices are known in which a character is displayed in a raster segment or a cathode ray tube as a pattern of dots. However, such devices have not permitted a character to be vertically displaced by only a fraction of a raster segment and the invention disclosed has that capability. In the invention disclosed a refresh memory stores information about a character to be displayed, including its address, and also information regarding raster modification. The raster modification information is fed to a raster modi- fication circuit where it is combined with raster count information so that the dots normally displayed in,say, line 0 to 3 of one raster segment are shifted down to be displayed in lines 4 to 8 and the dots of lines 5 to 8 of the downwardly adjacent segment are shifted up to be dispalyed in lines 0 to 4.

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