Discharging a picture display tube

Details Discharging a picture display tube Discharging a picture display tube

1996-01-11

1997-07-29

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2952

Patent

active

056524838

ABSTRACT:
Method of discharging a picture display tube (3) in a picture display device, and picture display device provided with a picture display tube discharge circuit, in which the picture display tube (3) is discharged by switching off a generation (20; 23) of an anode voltage (Va) of the picture display tube (3) and by controlling (4) a defined electron current in the picture display tube (3). Prior to generating (4) the defined electron current, the deflection (2) of the electron beam is displaced to beyond a visible part of a display screen (32) of the picture display tube (3). In this way, the picture display tube (3) is discharged without this being accompanied with bright light phenomena visible on the display screen (32). The anode voltage (Va) decreases to a safe value and there is no cold emission and no phosphor burn-in on the display screen (32).

REFERENCES:
patent: 4475057 (1984-10-01), Morris
patent: 5184225 (1993-02-01), Heidebroek et al.

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