Tri-state on-screen display system

Details Tri-state on-screen display system Tri-state on-screen display system

1985-05-10

1988-07-26

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

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

340730, 340734, 340811, 358183, G09G 114

Patent

active

047603917

ABSTRACT:
An on-screen character display system includes a tri-state character generator for generating a tri-state character signal having black portions corresponding to the leading and trailing edging portions of the character and a white portion corresponding to the body of the character and an inactive level when no character is to be displayed. To prevent the shielded cable used for coupling the tri-state character signals to video signal processing circuit from remaining charged to the black level corresponding to the trailing edging portion too long thereby creating a disturbing inequality between the widths of the edging portions, an auxiliary driver circuit is enabled to drive the shielded cable toward the inactive level when the character is supposed to end.

REFERENCES:
patent: 3984828 (1976-10-01), Beyers, Jr.
patent: 4218698 (1980-08-01), Bart et al.
patent: 4432016 (1984-02-01), Shanley, II et al.
patent: 4437092 (1984-03-01), Dean et al.
patent: 4459585 (1984-07-01), Pasternak
Pages 29-31 and 60-61 of "RCA Television Basic Service Data-CTC 131 Series", file 1984, CTC 131, Second Edition, published by RCA Corporation, Indianapolis, Ind.

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