Video display apparatus display modification

Details Video display apparatus display modification Video display apparatus display modification

1977-02-16

1979-03-27

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

358153, 340736, 340748, G06F 314

Patent

active

041468783

ABSTRACT:
In visual display apparatus in which characters are displayed by modulation of a TV type raster on a cathode ray tube, the normally uniform spacing of the sweep lines of the raster is selectively modified to produce groups of lines having decreased spacing therebetween. The groups of lines are modulated to display rows of characters on the screen of the cathode ray tube. The spacing of the remaining lines between the groups is at the same time increased to provide a wider separation between the rows of characters thereby improving the aesthetic appearance of the display. Video modulation, synchronizing and control signals are obtained from a composite input signal. The control signals are utilized to operate a sweep modification circuit.

REFERENCES:
patent: 3298013 (1967-01-01), Koster
patent: 3423749 (1969-01-01), Newcomb
patent: 3491200 (1970-01-01), Wisnieff

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