Video display controller

Details Video display controller Video display controller

1985-05-22

1987-08-04

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

340701, 340799, G09G 128

Patent

active

046849424

ABSTRACT:
A video display controller is provided with a color palette circuit which is capable of converting, at a high conversion rate, color codes read from a VRAM (video RAM) into RGB color data to be supplied to a CRT display unit. The color palette circuit comprises a plurality of color data registers each storing one RGB color data and is supplied with a timing signal synchronized with the display timing of display elements on the CRT display screen. Each color code data including at least two color codes and read from an address of the VRAM is first supplied to a selection circuit which includes at least two decoders. Each decoder decodes the corresponding color codes to generate a selection signal which enables one of the color data registers to output the RGB color data contained therein. Thus, at least two RGB color data are outputted from the color data registers enabled by the outputs of the decoders, and are supplied to an output control circuit which outputs each of these RGB color data in a multiplexing fashion in accordance with the timing signal.

REFERENCES:
patent: 3854130 (1974-12-01), Ligocki
patent: 3944999 (1976-03-01), Moore
patent: 4016544 (1977-04-01), Morita et al.
patent: 4310838 (1982-01-01), Juso et al.
patent: 4360804 (1982-11-01), Ohura
patent: 4368461 (1983-01-01), Komatsu et al.
patent: 4442428 (1984-04-01), Dean et al.
patent: 4590463 (1986-05-01), Smollin

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