Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
1994-11-10
1996-09-24
Brier, Jeffery
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
G09G 508
Patent
active
055595324
ABSTRACT:
A display system displays a cursor on a monitor using parallel pixels of video data. A hardware cursor processor receives a sequence of clock signals, cursor data, parallel video data arranged in P logical pixels per clock signal, and cursor position data. The hardware cursor processor provides composite video data representative of the cursor data and the video data to a memory. The composite video data is arranged in P logical pixels per clock signal. The hardware cursor processor arranges the cursor data within the P logical pixels per clock signal in response to the cursor position data. The cursor position data includes a position signal HPOS indicative of the horizontal position of the cursor on the screen and includes a preset signal HPRE indicative of the horizontal offset of the cursor. The cursor data is arranged within the P logical pixels of the composite video data to begin at the logical pixel equal to [(HPOS-HPRE) modulus P].
A memory has an input coupled to the output of the hardware cursor processor and has an output for providing a digital video signal indicative of the video data and the cursor data. A digital-to-analog converter has an input coupled to the output of the memory for receiving the digital video signal and has an output coupled to the monitor for providing an analog signal indicative of the cursor data and the video data. The monitor has an input coupled to the output of the digital-to-analog converter for displaying the video data and the, cursor data in response to the analog signal.
REFERENCES:
patent: 5146211 (1992-09-01), Adams et al.
patent: 5196834 (1994-03-01), Edelson et al.
patent: 5359347 (1994-10-01), Kim et al.
patent: 5361081 (1994-11-01), Barnaby
Brier Jeffery
LSI Logic, Inc.
Smith Albert C.
Weller Edward B.
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