Visual display system having low energy data storage subsystem w

Details Visual display system having low energy data storage subsystem w Visual display system having low energy data storage subsystem w

1994-06-22

1996-04-30

Brier, Jeffery

Computer graphics processing and selective visual display system

Display driving control circuitry

Physically integral with display elements

345185, G09G 536

Patent

active

055129218

ABSTRACT:
A visual display system for use in computers includes a frame buffer for holding visual information data in a particular format for ready input to a visual display device. The system also includes a compressed frame buffer for storing the visual information data in a compressed format which can be rapidly decompressed in real-time and used in the visual display device. The data is compressed by a microprocessor during idle times and decompressed by a decompression circuit on the fly. In some circumstances, the power consumed by compressing and then repeatedly handling the compressed data is less than the power used to repeatedly handle the full uncompressed data set. The visual display system analyzes the visual information data and determines whether compression would help save energy. In the event that the handling of compressed data saves energy, the visual display system will use the compressed data set until the information is changed or updated. In this manner, the visual display system reduces power consumption which helps improve battery life in portable computers. A method for operating a visual display system using this energy saving compression technique is also described.

REFERENCES:
patent: 4233601 (1980-11-01), Hankins et al.
patent: 5081450 (1992-01-01), Lucas et al.
Rhodes, Michael L. et al., "Locally Optimal Run-Length Compression Applied to CT Images", IEEE Trans. on Medical Imaging, vol. MI-4, No. 2, pp. 84-90, Jun. 1985.
Compression/Decompression of Font Patterns, IBM Technical Disclosure Bulletin vol. 28, No. 8, Jan. 1986, pp. 3563 and 3564.

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