Scaled video output overlaid onto a computer graphics output

Details Scaled video output overlaid onto a computer graphics output Scaled video output overlaid onto a computer graphics output

1995-05-04

1998-01-20

Garber, Wendy

Computer graphics processing and selective visual display system

Display peripheral interface input device

Light pen for fluid matrix display panel

545115, 348584, G06F 1566, H04N 5262

Patent

active

057105731

ABSTRACT:
A display control apparatus is provided to generate a scaled video output overlaid onto a computer graphics output. The display control apparatus includes a timing generator, adapted to receive a horizontal synchronization signal of the computer graphics output and the pixel number of horizontal scan line of the scaled video output, for generating a pixel clock of scaled video output and a horizontal lock signal; a scaling buffer, storing a video digital pixel data and having an output port generating the scaled video output, responsive to the pixel clock of scaled video output; an overlay controller, coupled to a controller bus and receiving an analog pixel data of the computer graphics output and, responsive to the pixel clock of scaled video output, the horizontal lock signal and a vertical synchronization signal of the computer graphics output, for overlaying the scaled video output onto the computer graphics output.

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patent: 5532716 (1996-07-01), Sano
patent: 5541666 (1996-07-01), Zeidler et al.

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