Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
1994-06-08
1996-09-17
Brier, Jeffery
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
345138, G09G 536, G09G 320, G09G 336
Patent
active
055572979
ABSTRACT:
A system and method for processing analog XYZ calligraphic video signals for presentation as a stroke image on a flat panel LCD raster display screen by converting such signals in coordinated sets to digital data in a stroke frame buffer memory. The X and Y signals define column and row addresses in memory for storage of the coordinated Z digital color brightness data, which addresses correspond to pixel locations on the surface of the display screen to which the data is transferred to form the stroke image. By storing fractional bits from the X and Y digital data in the buffer memory along with the coordinated color intensity data a high resolution stroke image can be formed using a conventional sized buffer memory. Further, noise and clock conversion artifacts are minimized by saving the first point of each stroke line or vector and by using the X and Y fractional bits for beam shaping utilizing anti-aliasing discs. The discs are a set of prestored circular intensity profiles, each covering several pixels and having their respective centers variously offset by fractions of a pixel spacing from points defining the ideal center of the stroke line to be formed. Appropriate discs are successively copied to memory in overlapped manner for each pixel, based on the location of the profile center with respect to a stroke defining point in the pixel. The data output from the stroke frame buffer is thus shaped by the disc data in presenting the high resolution, anti-aliased stroke image on the raster display screen.
REFERENCES:
patent: 4366476 (1982-12-01), Hickin
patent: 5339092 (1994-08-01), Johnson et al.
Kelleher Kevin
Patel Jayanti
Sharp Daniel
Brier Jeffery
Casella Anthony J.
Hespos Gerald E.
Smiths Industries
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