Computer graphics processing and selective visual display system – Computer graphics display memory system – Frame buffer
Reexamination Certificate
2006-08-22
2010-06-29
Hsu, Joni (Department: 2628)
Computer graphics processing and selective visual display system
Computer graphics display memory system
Frame buffer
C345S556000, C345S530000
Reexamination Certificate
active
07746351
ABSTRACT:
A method for dividing a display into zones at system initialization for tracking which zones have any pixels revised so that, when the time comes to update the display, only the zones requiring revision (that is, those zones in which any pixel has been revised) are copied from shadow memory to the frame buffer for display on the display device. The memory for tracking these zones can be allocated at initialization and held since it is relatively small. Consequently, a significant performance gain may be achieved by avoiding the shortcomings of the existing methods in the art notwithstanding the fact that some “clean” pixels in each zone having even a single changed pixel are also rewritten to the frame buffer.
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Hsu Joni
Microsoft Corporation
Woodcock & Washburn LLP
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