Video display controller for enlarging visual images depending u

Details Video display controller for enlarging visual images depending u Video display controller for enlarging visual images depending u

1990-05-24

1992-06-16

Weldon, Ulysses

Communications: electrical

Land vehicle alarms or indicators

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

340814, 340798, 340750, 358451, G09G 105

Patent

active

051227894

ABSTRACT:
A video display controller supplies a raster address signal to a video memory for sequentially reading out a series of video data codes, and comprises a first data register for memorizing a control data code indicative of a bit length to be circulated in a rewritable manner, a second register for memorizing a repetition rate code indicative of a repetition pattern of the raster address in a rewritable manner, a combination of a shift register and a selector supplied with the repetition rate code in synchronism with a frame clock signal and circulating the data bits of the repetition code indicated by the control data code in synchronism with a line clock signal and a raster counter responsive to an enable signal fed from the selector and latching the line clock signal for incrementing the raster address, wherein the raster address is incremented or maintained depending upon the data bit at a predetermined bit position serving as the enable signal, so that the series of video data codes are repeatedly read out from the video memory for enlarging visual images on a screen.

REFERENCES:
patent: 4439762 (1984-03-01), Van Vliet et al.
patent: 4935731 (1990-06-01), Takebe et al.

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