Graphics display unit

Computer graphics processing and selective visual display system – Computer graphic processing system – Integrated circuit

Patent

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Details

345202, 345509, G06F 1200

Patent

active

060942045

ABSTRACT:
A graphics display unit is equipped with a frame buffer, an image drawing unit, and a display unit. This frame buffer is arranged by a normal data storage region for directly storing a display content as pixel data, and a compression data storage region for compressing the pixel data as compression data. The display unit is equipped with a flag buffer for storing information indicating as to whether the storage content of said compression data storage region is valid, or invalid, and a compressing unit, and an expanding unit. When the display content is read, while the control unit refers to the flag buffer, if the compression data of the compression region is valid, then the compression data is read from the compression data region and this read compression data is restored as the original data by the expanding unit so as to display the original image. If the compression data is invalid, then the normal data is read from the normal data storage region to be displayed. At the same time, this normal data is compressed by the compressing unit and then the compressed data is stored into the compression data storage region, and a valid flag is set to the flag buffer. The image drawing unit writes the normal data into the normal data storage region to draw the original image. When the normal data is written into the normal data storage region, the image drawing unit clears the flag buffer.

REFERENCES:
patent: 5745125 (1998-04-01), Deering et al.
patent: 5748904 (1998-05-01), Huang et al.
patent: 5790110 (1998-08-01), Baker et al.
Linley Gwennap, "MediaGX Targets Low-Cost PCs", Microdesign Resources, vol. 11, No. 3, Mar. 10, 1997, 4 pages.

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