Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
1991-11-08
1994-12-06
Weldon, Ulysses
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
345150, G09G 128
Patent
active
053715179
ABSTRACT:
A color palette selects a master clock from plural clock signals received at clock input terminals in response to a master clock selection control word received at control data terminals. A circuit forms a plurality of divided down clock signals from selected divide ratios of the master clock. A circuit selects a shift clock from among the divided down clock signals in response to at least some bits of an output clock selection control word received at the control data terminals. A circuit selectively enables and disables the shift clock in response to blanking data. A circuit selects a video clock from among the divided down clock signals in response to at least some bits of the output clock selection control word. A circuit synchronizes multiple bit words of color code received at color code input terminals with the master clock. A circuit outputs at least one memory recall address in response to receiving each multiple bit word of color code. A circuit stores color data words in a plurality of data storage locations, having associated memory recall addresses, and outputs a color data word upon receipt of an associated memory recall address. A circuit selectively writes color data words into these plural locations. A circuit synchronizes video control signals received at video control terminals with the master clock and provides the blanking data. A circuit selects for output between said color data words and true color data words received at said color code input terminals.
REFERENCES:
patent: 4769632 (1988-09-01), Work
patent: 4803464 (1989-02-01), Holme et al.
patent: 4815033 (1989-03-01), Harris
patent: 4933878 (1990-06-01), Guttag et al.
patent: 5038300 (1991-08-01), Seiler et al.
Brooktree, "BT459", Product Data Book 1989, 1989 pp. 5-85 through 5-115.
Texas Instruments Incorporated, "TMS34070-20 Color Pallette" Production Data, 1986, pp. 1-15.
Brooktree, "RAMDAC Products" Winter 1990 Product Selection Guide, Winter, 1990, pp. 9-15.
Asal Mike
Guttag Karl
Izzi Louis
Killebrew, Jr. Carrell R.
Krenik William R.
Chow Doon
Donaldson Richard L.
Kesterson James C.
Marshall, Jr. Robert D.
Texas Instruments Incorporated
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