System and methods for optimized screen writing

Details System and methods for optimized screen writing System and methods for optimized screen writing

1993-02-19

1995-08-29

Powell, Mark R.

Computer graphics processing and selective visual display system

Display driving control circuitry

Controlling the condition of display elements

345185, G06F 1200

Patent

active

054468400

ABSTRACT:
System and methods are provided whereby screen write operations, such as common in data processing, are performed at a frequency matched to a user's ability to perceive such information. Specifically, screen writing operations are minimized to only those which are really necessary for perception by the user. In all other instances (i.e., time periods when updating is not needed), image information is written to rapid-access memory. At periodic intervals, the system is interrupted so that a display image (maintained in video memory) is updated from the image stored in the rapid-access memory. A screen device (CRT) coupled to the video memory is updated accordingly (upon the next scan of video memory). By maintaining image data locally, the penalty incurred with frequent, large data transfers to video or display memory is avoided.

REFERENCES:
patent: 4139869 (1979-02-01), Holt
patent: 4506298 (1985-03-01), Mansell et al.
patent: 4688167 (1987-08-01), Agarwal
patent: 4688190 (1987-08-01), Bechtolsheim
patent: 5208908 (1993-05-01), Harrison et al.
patent: 5245328 (1993-09-01), Garrett

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