Raster graphical display apparatus

Details Raster graphical display apparatus Raster graphical display apparatus

1988-10-06

1991-06-11

Oberley, Alvin E.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340703, G09G 116

Patent

active

050236024

ABSTRACT:
Computer graphics requiring three dimensional representation needs very fine color shading which is not possible with only 8 planes (bits) per-pixel. In order to provide improved color shading with acceptable resolution a video raster signal, with n (e.g. 8) planes per pixel and based on a resolution of x pixels per line and y lines, can be selectively processed (M1, M2, M3) to provide mn (e.g. 16 or 24) planes per macro-pixel where m is an integer greater than 1 and m=m1.m2 where m1 is the dimension in pixels of each macro-pixel along the scan lines and m.sup.2 is the dimension of each macro-pixel transverse to the scan lines (in terms of lines of the normal raster). In one arrangement the 16 planes normally used to drive 3 color guns (red, green and blue) for an odd-even pixel pair are used for providing non-intersecting sets of 5 planes for each of the guns. In another arrangement the 8 planes for odd and even pixels (i.e. 16 planes available) are used for the red and green guns respectively in one scan line of each pair of scan lines and in the other scan line of the pair 8 of the 16 planes are used for the blue gun, each of the guns being operated for 50% of the pixel scanning time.

REFERENCES:
patent: 3911418 (1975-10-01), Takeda
patent: 4509043 (1985-04-01), Mossaides
patent: 4543645 (1985-09-01), Vigarie
patent: 4559531 (1985-12-01), Buynak
patent: 4580134 (1986-04-01), Campbell et al.
patent: 4590463 (1986-05-01), Smollin
patent: 4591842 (1986-05-01), Clarke, Jr. et al.
patent: 4613852 (1986-09-01), Maruko
patent: 4829291 (1989-05-01), Elgood et al.

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