Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
1993-08-16
1994-12-27
Oberley, Alvin E.
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
345189, 345162, G09G 102
Patent
active
053769490
ABSTRACT:
A display system has cursor definition memory for storing data defining a graphics cursor, and a cache for the temporary storage of a portion of the graphics cursor for display on a display device, the cache being such that its data rate is sufficient to support the display of the graphics cursor, and control logic for updating the cache from the cursor definition memory at a slower data rate. The cache need only be large enough to store a portion of the cursor at any one time as the graphics cursor is only displayed for a fraction, for example one-tenth, of a scan line and the cache can be updated during the portion of the scan time when the cursor is not displayed. Through the use of a small cache operable at the required data rate, inexpensive memory which does not support the required data rate can be used for the cursor definition memory.
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Bonnor Helen R.
Haigh David C.
Harrison Roy B.
International Business Machines Corp.
Liang Regina
McKinley Martin J.
Oberley Alvin E.
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