Character scrolling method and apparatus

Details Character scrolling method and apparatus Character scrolling method and apparatus

1992-04-07

1995-12-19

Hjerpe, Richard

Computer graphics processing and selective visual display system

Display peripheral interface input device

Light pen for fluid matrix display panel

345123, 345136, 345199, 345114, G09B 106

Patent

active

054772400

ABSTRACT:
A method for scrolling, at a desired rate and in a given direction, a graphic character on a display having a predetermined number of actual scan lines and a vertical blanking interval occurring between successive display of all the actual horizontal scan lines of the display, involves the creation of fractional scan lines between successive vertical blanking intervals, the identification of leading and trailing edges of the character and the selective changing of the color or shading of pixels of the leading and trailing edges to effect scolling of the character.

REFERENCES:
patent: 3714630 (1973-01-01), Cribbs
patent: 4654650 (1987-03-01), Fadem
patent: 4704605 (1987-11-01), Edelson
patent: 4714919 (1987-12-01), Foster
patent: 4808984 (1989-02-01), Trueblood et al.
patent: 4849746 (1989-07-01), Dubner

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