Displaying an image using memory control unit

Details Displaying an image using memory control unit Displaying an image using memory control unit

2005-04-20

2008-07-01

Washburn, Daniel (Department: 2628)

Computer graphics processing and selective visual display system

Computer graphics display memory system

Graphic display memory controller

C345S649000, C345S537000, C345S538000, C345S544000

Reexamination Certificate

active

07394465

ABSTRACT:
A memory control unit controls the transfer of image data from a video buffer to a frame buffer, and from the frame buffer to a display, to be performed block by block. Image data is written from a video buffer to the frame buffer one block at a time. When image data for the entire block has been written to the frame buffer, the data for that block can be refreshed on the display. Image data for the next frame can only be written to the frame buffer once the data in that block has been refreshed on the display. In this way, image tearing can be eliminated. Images can also be successfully rendered when the direction of writing data to the frame buffer is perpendicular to the direction of copying data from the frame buffer and refreshing the display. Thus, landscape images can be rendered on a portrait display, without the need for double buffering.

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