Circuit for preventing burn-in spots on the picture screen of a

Details Circuit for preventing burn-in spots on the picture screen of a Circuit for preventing burn-in spots on the picture screen of a

1985-06-19

1987-06-30

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

358220, 250397, H01J 2952

Patent

active

046773517

ABSTRACT:
A circuit for preventing burn-in spots on the picture screen 23 of a visual display 2 comprising an electron beam 19 that is intensity modulated and positioned controlled by way of a deflection system 21, 22 as, for example, for a scanning electron microscope. The protection to prevent burn-in spots utilizes a circuit wherein the signal input 24 of at least one deflection system 21 is electrically connected to a differentiator which produces an output that is connected to the first input of a comparator which also receives a reference voltage and the comparator output is switched to the input of a retriggable trigger circuit so as to control the intensity of the electron beam 19 and thus prevent burn-in on the picture screen.

REFERENCES:
patent: 3963961 (1976-06-01), Ray et al.
patent: 4180738 (1979-12-01), Smith et al.
patent: 4480220 (1984-10-01), Isakozawa et al.
"Raster-Elektronmikroskopie", L. Reimer U. G. Pfefferkorn Springer-Verlag, Berlin 1973-pp. 1-3.

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