Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1996-04-02
1999-01-19
Hjerpe, Richard A.
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345116, 348443, G09G 500
Patent
active
058618643
ABSTRACT:
A video interface system and method produce an interlaced video signal from a noninterlaced graphics signal produced by a computer. The video interface system receives a digitized noninterlaced graphics signal directly from the graphics system of the computer and converts the graphics signal into an analog interlaced video signal. The noninterlaced graphics signal is characterized by a higher resolution and higher frequency than the analog interlaced video signal. In the preferred embodiment, the video interface is connected to a decoder within the graphics system. The decoder generates and combines timing signals with pixel values from a frame buffer to produce a noninterlaced graphics signal. In architecture, the video interface has an x-filter configured to receive the graphics signal and configured to scale an x-dimension of an image represented by the graphics signal, a y-filter connected to the x-filter for scaling a y-dimension of the image represented by the graphics signal, a cache connected to the y-filter for receiving data from the y-filter at a first rate and for providing the data to the y-filter, a field memory for receiving the data from the cache at a second rate that is slower than the first rate, and a video encoder for receiving data from the field memory at a third rate that is slower than the first and second rates and for providing the analog interlaced video signal.
REFERENCES:
patent: 4745458 (1988-05-01), Hirano et al.
patent: 5493299 (1996-02-01), Song et al.
patent: 5510843 (1996-04-01), Keene et al.
patent: 5557302 (1996-09-01), Levinthal et al.
Hewlett--Packard Company
Hjerpe Richard A.
Nguyen Tracy H.
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