Digital multi-beam CRT controller

Details Digital multi-beam CRT controller Digital multi-beam CRT controller

1985-07-03

1987-09-22

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2956

Patent

active

046957723

ABSTRACT:
There is described a picture quality control system for use with a multi-beam cathode ray tube raster scan display device. The display device generates an image comprising a multiplicity of parallel, nonoverlaping bands of pixels, each band of pixels comprising a set of parallel lines of pixels.
The control system includes a linearity correction circuit and a dynamic detwist correction circuit. The linearity correction circuit adjusts the distance between neighboring bands of pixels. The dynamic detwist correction circuit adjusts the relative positions of the electron beams generated by the cathode ray tube.
The control system further includes a dynamic astigmatism correction circuit and a dynamic focus correction circuit for correcting astigmatism and focus imperfections in the image generated by said cathode ray tube. A dynamic size correction circuit adjusts the size of the pixels generated by the electron beams.
The display is organized as an array of tiles. Each dynamic correction circuit in the control system includes a digital memory for storing a corresponding correction value for each said tile. Each correction value specifies the magnitude of the electromagnetic field to be generated by the corresponding coil or field generator when the cathode ray tube's electron beams are being deflected into the corresponding tile.

REFERENCES:
patent: 3852640 (1974-12-01), McCarthy
patent: 3959689 (1976-05-01), Ikoma
patent: 4410841 (1983-10-01), Dusard et al.
patent: 4520356 (1985-05-01), O'Keefe et al.

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