Apparatus and method for horizontally and vertically positioning

Details Apparatus and method for horizontally and vertically positioning Apparatus and method for horizontally and vertically positioning

1995-07-31

1997-10-28

Brier, Jeffery

Computer graphics processing and selective visual display system

Plural display systems

Diverse systems

345118, G09G 300, G09G 500

Patent

active

056821700

ABSTRACT:
A method and apparatus for horizontally and vertically positioning a video graphics adapter (VGA) display image on the screen of a flat panel display (FPD) is provided with a first counter for setting a horizontal FPD disable period associated with the FPD. A second counter sets the horizontal FPD enable period of the FPD. This horizontal FPD enable period is greater than a composite horizontal pixel time of a VGA image to be displayed. A first circuit controls the start time of a subsequent horizontal FPD enable period. This start time is based on the horizontal FPD disable period. A second circuit controls the end time of the subsequent horizontal FPD enable period. This end time is based on the horizontal FPD enable period. The VGA display image is begun based on the start time of the subsequent horizontal FPD enable period to locate the VGA display image at a desired horizontal position of the FPD screen. The vertical positioning of the image is performed by similar counters and circuits.

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Sutty & Blair, Advanced Programmer's Guide to the EGA/VGA (1988), pp. 19-23, 26-27, 44-51.
Ferraro, Progammer's Guide to the EGA and VGA Cards (1993), pp. 278-284.
U.S. application Ser. No. 07/890,525, Uhlin and Lin filed May 28, 1992.

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