Video display terminal having improved character shifting circui

Details Video display terminal having improved character shifting circui Video display terminal having improved character shifting circui

1979-08-03

1982-08-03

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340750, 340799, G09G 116

Patent

active

043429904

ABSTRACT:
A video display terminal is disclosed for use in displaying images of data characters on a display screen. Multibit coded data words are supplied by a data source, such as a memory, to a character generator circuit which controls the display of data characters on the face of a video display screen. Character codes are used to address a dot pattern memory which stores dot patterns to provide an image of the required data character to be displayed. The dot patterns may be stored on one size matrix in the dot pattern memory, such as in a 9.times.9 cell, and displayed on a larger dot matrix, such as 9.times.16, on the display screen. Subscripts or descending characters may be stored in the dot pattern memory and vertically repositioned when displayed on the screen. Means are also provided for adjusting the vertical positioning of a line of characters.

REFERENCES:
patent: 3659283 (1972-04-01), Ophir
patent: 3918040 (1975-11-01), Beuter et al.
patent: 3976990 (1976-08-01), Haak
patent: 3988728 (1976-10-01), Inoue et al.
patent: 4141003 (1979-02-01), Felsenstein
patent: 4246578 (1981-01-01), Kawasaki et al.

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