Character generator for displaying characters with a shadow on a

Details Character generator for displaying characters with a shadow on a Character generator for displaying characters with a shadow on a

1992-07-24

1993-04-06

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

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

340703, 340723, G09G 106

Patent

active

052007391

ABSTRACT:
Character generator which provides the displayed characters, when displayed simultaneously with a video picture, with a shadow in a complimentary or programmable color so that the readability is optimum under all circumstances without any unnecessary blanking of the video picture. To this end the character generator (43) is adapted to alternately address both the pixel to be displayed and at least one adjacent pixel in a character memory (171). A blanking signal (FBL), which blanks the received video picture dependent on both the pixel to be displayed and the adjacent pixel, is generated in a blanking circuit (20). While the video picture is being blanked, the characters are displayed in a foreground color and the shadow is displayed in a background color. The invention is applicable in television receivers, camera recorders and the like, using a character generator for displaying locally generated operating information (On Screen Display) or information supplied by an external source (Teletext).

REFERENCES:
patent: 3918039 (1975-04-01), Clark
patent: 4186393 (1980-01-01), Leventer
patent: 4408198 (1983-10-01), Kudirka
patent: 4794451 (1988-12-01), Suzuki et al.
patent: 5003303 (1991-03-01), Kellar et al.

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