RGB video amplifier system integrating blanking and brightness c

Details RGB video amplifier system integrating blanking and brightness c RGB video amplifier system integrating blanking and brightness c

1991-02-15

1992-04-21

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

358 34, H01J 2952

Patent

active

051071894

ABSTRACT:
An RGB video display terminal (VDT) is disclosed and the color cathode ray tube (CRT) driver circuits detailed. The driver circuits include a common video gain control which can be varied over a wide range without changing the DC bias level. Each CRT gun can have its driver gain separately controlled over a vernier range and its DC bias can be separately controlled. The video amplifier is AC coupled to the video input and includes a DC reinsertion circuit which clamps the DC bias at a level related to the composite video level immediately following the sync pulse. Therefore, the DC reinsertion is clamped for each scanning line at the CRT black level. The video amplifier also includes a blanking circuit which turns the CRT guns off during the VDT retrace interval. Thus, the driver circuits can drive the CRT guns in a manner that will simultaneously control their operation for the color display and yet take into account the manufacturing tolerance in individual gun characteristics.

REFERENCES:
patent: 4811101 (1989-03-01), Yagi

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