Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
1995-10-30
1997-07-15
Hjerpe, Richard
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
345147, G09G 510
Patent
active
056487967
ABSTRACT:
As a surface having an apparent grey level is obtained by activating a certain proportion of pixels of this surface, the screen is virtually divided into blocks of pixels all having the same dimensions and a set of patterns each representing a block is defined in advance for each desired apparent grey level, while the different patterns of one and the same set all have the same proportion of active pixels, for example two out of sixteen for a grey level of 2/16 in the scale ranging from white to black (20-27) but a different arrangement of inactive pixels and active pixels, and for the display of each pixel of the image a pattern of the set corresponding to the desired grey level is selected, and the pixel is displayed in the active or inactive state of the dot having the same position in the selected pattern. A different pattern (from 20 to 27) is chosen at each redefinition of an image.
REFERENCES:
patent: 3997719 (1976-12-01), Judice
patent: 5053764 (1991-10-01), Barbier et al.
patent: 5130821 (1992-07-01), Ng
patent: 5220314 (1993-06-01), Mano et al.
Boursier Alain
De Crouychanel Remy
Giron Louis
Chang Kent
Fox John C.
Hjerpe Richard
Spain Norman N.
U.S. Philips Corporation
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