Method of driving a flat type of cathode ray tube to provide uni

Details Method of driving a flat type of cathode ray tube to provide uni Method of driving a flat type of cathode ray tube to provide uni

1986-09-30

1987-09-15

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315383, 313422, H07J 2970

Patent

active

046942254

ABSTRACT:
A method of producing uniformity of emission a characteristics of a plurality of electron beam sources in a cathode ray tube, by deriving and storing data values for producing respective correction voltages to be applied to modify the emission characteristics. Each data value is obtained by sensing a current which flows through one of the control electrodes when a high voltage electrode is set to a relatively low potential, comparing this current with a reference value and storing the difference for use in subsequently producing a correction voltage. Data values are derived during successive time intervals, with corresponding correction voltages being successively applied to achieve feedback operation, for greater correction accuracy.

REFERENCES:
patent: 4525653 (1985-06-01), Smith
patent: 4626899 (1986-12-01), Tomii et al.

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