Method and apparatus for increasing the number of characters per

Details Method and apparatus for increasing the number of characters per Method and apparatus for increasing the number of characters per

1983-12-29

1986-11-18

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

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

340747, G09G 114

Patent

active

046238816

ABSTRACT:
A method and apparatus are provided for increasing the number of characters or symbols that can be displayed on a line when the video signal that produces the display is restricted to a limited bandwidth, such as in the case of RF modulating the video signal to produce the display on an unmodified television set. The bandwidth of the video signal is reduced by displaying different portions of the display during one field time and the remaining portion of the display during the next field time. The persistence of the television screen creates the illusion of a complete display. Each luminescent region of each line will be displayed during one field time and blanked during the next field time. In the preferred embodiment, adjacent luminescent regions of a scan line (e.g., separated only by a black region) will be displayed in opposite fields. In an alternative embodiment, adjacent character regions will be displayed in opposite fields. The invention is compatible with standard and high definition television receivers.

REFERENCES:
patent: 4250502 (1981-02-01), Klauck et al.
patent: 4321599 (1982-03-01), Yoshiba
patent: 4447809 (1984-05-01), Kodama et al.
patent: 4476464 (1984-10-01), Hobbs
patent: 4516118 (1985-05-01), Wahlquist

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