Automatic beam current control circuit for multimode monitor and

Details Automatic beam current control circuit for multimode monitor and Automatic beam current control circuit for multimode monitor and

1995-08-25

1996-08-27

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

348327, 315411, H01J 2952

Patent

active

055504434

ABSTRACT:
An automatic beam current control circuit for a multimode monitor provides a high voltage circuit for regulating its output voltage according to a video signal being applied to a cathode ray tube, a luminance data compensator having an analog-to-digital (A/D) conversion port for receiving the output voltage of a feedback signal from the high voltage circuit and using a microprocessor to compare data converted by the analog-to-digital (A/D) conversion port with reference luminance data stored in a memory to thereby output an automatic beam current control value, and an automatic beam current controller for receiving the automatic beam current control value and automatically adjusting beam current provided to the cathode ray tube. A method for automatically controlling beam current in the multimode monitor includes the steps of performing mode detection by checking the horizontal or vertical synchronization signal of the multimode monitor, reading the preset luminance data for the relevant operational mode from the memory, reading present luminance data from the high voltage circuit, and performing luminance data compensation by comparing the preset luminance data and the present luminance data, adjusting the present luminance data to equal the preset luminance data, and automatically outputting the compensated present luminance data to the automatic beam current controller.

REFERENCES:
patent: 4295166 (1981-10-01), Shanley, II et al.
patent: 4330792 (1982-05-01), Naimpally
patent: 4568861 (1986-02-01), Doran et al.
patent: 4885510 (1989-12-01), Matthews
patent: 4902940 (1990-02-01), Herbert
patent: 5231496 (1993-07-01), Tokui

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