CRT character display apparatus employing double height algorith

Details CRT character display apparatus employing double height algorith CRT character display apparatus employing double height algorith

1990-06-28

1991-05-14

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

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

340748, G09G 116

Patent

active

050160001

ABSTRACT:
A data display arrangement in which each of a number of different characters displayed on a CRT is defined by selected dots of a dot matrix. The stored character information from which character generating signals are produced is in the form of corresponding memory cell bit matrix. Such character information is read-out once in a number of successive scanning lines of each field to display the character normal height, and hitherto has been read-out twice in a number of successive pairs of scanning lines of each field to display the character double height. The invention provides a "double height algorithm" which modifies the read-out for double height character display such that part of a memory cell is read-out once and part is read-out twice. This results in a non-linear expansion of a double height character the effect of which is to maintain the visual baseline of a character row. With respect to a simple expansion, the enlarged character is "pushed down" by a number of scanning lines thus maintaining the baseline. Any part of a character below the baseline is "compressed" into the space below it. FIG. 2 shows examples of displayed characters.

REFERENCES:
patent: 4314244 (1982-02-01), Demke et al.
patent: 4321596 (1982-03-01), Hernandez et al.
patent: 4345245 (1982-08-01), Vella et al.

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