Apparatus for generating displays of variable size characters

Details Apparatus for generating displays of variable size characters Apparatus for generating displays of variable size characters

1978-05-26

1980-12-23

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

178 15, 178 30, 340744, 340750, G06F 314

Patent

active

042413400

ABSTRACT:
A character display system is disclosed which provides displays of characters of variable size. A diddle raster scanning technique is used to display each character in its entirely before proceeding with the display of the next character. The size of the character is increased by increasing the size of the diddle raster scanned. In order to improve the appearance of larger point size characters, each character stroke is repeated a number of times N, where N increases with increasing point size.
A circuit (112) provides an indication of the size of the character to be displayed. This indication is used to address a ROM (146) which contains control information (D1-D5) therein. A portion (D2, ) D3, D5) of this information controls the size of the diddle raster scanned, and another portion (D1) provides the number N indicating the number of times each character stroke is to be repeated. A video generator (114) generates a video signal on the basis of this number N and various character codes supplied to it. A third portion (D4) of the control information sets the intensity of the video signal in accordance with point size so that characters of different sizes have the same apparent brightness.

REFERENCES:
patent: 3553676 (1971-01-01), Raciti
patent: 3568178 (1971-03-01), Day
patent: 3659283 (1972-04-01), Ophir
patent: 3893100 (1975-07-01), Stein
patent: 4078249 (1978-03-01), Lelke et al.
patent: 4079367 (1978-03-01), Yonezawa et al.
patent: 4090188 (1978-05-01), Suga
patent: 4107665 (1978-08-01), Mayer et al.

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