Horizontal scan modulator having size selection

Details Horizontal scan modulator having size selection Horizontal scan modulator having size selection

1990-09-17

1993-06-15

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2956

Patent

active

052202518

ABSTRACT:
A display monitor includes a conventional cathode ray tube display together with conventional display drive circuitry. Vertical and horizontal deflection systems are operative to provide raster scanning of the cathode ray tube. High voltage apparatus produce the required CRT beam accelerating potential. A scan modulator is coupled to the horizontal deflection system and is operative to provide stable control of the amplitude of horizontal deflection signal. A modulator drive control responds to the amplitude of horizontal deflection signal and produces a control signal utilized by the modulator in maintaining stable horizontal scan amplitude. A scan selection network is coupled to the modulator drive control to selectively alter the operating point of the scan modulator and thereby produce different scan widths for normal and expanded view operation.

REFERENCES:
patent: 4956587 (1990-09-01), Kitou et al.

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