Computer graphics processing and selective visual display system – Display driving control circuitry – Physically integral with display elements
Patent
1993-12-30
1996-10-08
Hjerpe, Richard
Computer graphics processing and selective visual display system
Display driving control circuitry
Physically integral with display elements
345185, 382232, G09G 500
Patent
active
055636330
ABSTRACT:
The present invention discloses a method and apparatus for performing data compression during monitor refresh operations. In one embodiment, it is envisioned that the compression functions would be performed in a refresh compaction device and the de-compression functions would be performed in a RAMDAC, thereby requiring only the transfer of compressed data between the refresh compaction device and the RAMDAC. In an alternative embodiment, it is envisioned that both the compression and de-compression functions would be performed in the refresh compaction device. Regardless of implementation, a "critical fill" level is determined during compression and a "critical fill" interrupt is generated during de-compression to gain control of the frame buffer before the compressed digital data is fully depleted.
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Richard A. Quinnell (Technical Editor), Image Compression Part 1, EDN, Jan. 21, 1993, pp. 62-71.
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AT&T Global Information Solutions Company
Gates George H.
Hjerpe Richard
Liang Regina
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