Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1994-09-27
1997-02-11
Hjerpe, Richard
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345115, G09G 514
Patent
active
056025653
ABSTRACT:
A video display apparatus of the present invention simultaneously displays a plurality of video images, which are overlapping with one another, on a display screen as a function of video data read out of a plurality of video memories without transferring the video data among the video memories. The video display apparatus includes three memory control units 71-73, which output clock signals CLK1 through CLK3 synchronous with three video signals RGB01-3 read out of three video memory units 61-63, respectively. A video signal switching unit 82 selects one of the three video signals while a clock signal switching unit 4 selects one of the three clock signals. A digital-to-analog converter 86 executes digital-to-analog conversion of the selected video signal using the selected clock signal. A video control signal generator 80 supplies read-permit signals HPIE1-3 and VPIE1-3 to the three memory control units 71-73 to alternate the video signals suppled to the display device. This results in displaying video images read out of the three video memory units 61-63 to be overlapped one upon another on the display screen.
REFERENCES:
patent: 4509043 (1985-04-01), Mossaides
patent: 4559533 (1985-12-01), Bass et al.
patent: 4602286 (1986-07-01), Kellar et al.
patent: 4992781 (1991-02-01), Iwasaki et al.
patent: 5268762 (1993-12-01), Hasegawa et al.
Hjerpe Richard
Liang Regina
Seiko Epson Corporation
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