Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
1992-06-22
1998-10-06
Lao, Lun-Yi
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
345501, 345515, 345507, G09G 500
Patent
active
058184171
ABSTRACT:
A circuit and method for providing VGA display data to a display of lower resolution, such as an LCD panel, is disclosed. The circuit detects a write to the Frame Buffer that stores the full resolution VGA image, determines the address within the Frame Buffer that was changed, then translates the Start Address of the circuit such that the recently updated data will be displayed at or near the center row of the display. The circuit blocks accesses to display data outside the range of data displayed on the lower resolution display such that the operation of the circuit is transparent to a conventional VGA controller, thereby providing automatic virtual display panning for VGA data that is displayed on a lower resolution display such as an LCD panel.
REFERENCES:
patent: 4439762 (1984-03-01), Van Vliet et al.
patent: 4618858 (1986-10-01), Belch
patent: 4924522 (1990-05-01), Bray et al.
patent: 4940970 (1990-07-01), Fujisaku
patent: 5006837 (1991-04-01), Bowers
patent: 5150109 (1992-09-01), Berry
Lao Lun-Yi
Moy Jeffrey D.
VLSI Technology Inc.
Weiss Harry M.
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