Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1989-05-19
1991-10-01
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
340745, 340748, G01R 1328, G09G 104, G09G 114
Patent
active
050536842
ABSTRACT:
System for controlling the position and intensity of an electron beam in a display tube of a display unit in such a manner that both analog signals as well as alphanumeric characters can be made visible simultaneously on the screen of the display tube. The period necessary for displaying a complete picture on the screen of the display tube is divided in two successive sub periods, a first sub period in which a sawtooth shaped signal is supplied to the X-deflection means, a number of analog signals superimposed onto a staircase bias signal is supplied to the Y-deflection means, the number of sawtooth slopes in said sawtooth shaped signal being equal to said number of analog signals, and a line fligh back suppression signal is delivered to the Z-control means, and a second sub period in which a first further sawtooth shaped signal is supplied to the X-deflection means, a second further sawtooth shaped signal is supplied to the Y-deflection means and alphanumeric character control signals are supplied to the Z-control means.
REFERENCES:
patent: 3599033 (1971-08-01), Stettiner et al.
patent: 4821030 (1989-04-01), Batson et al.
Issing Gregory C.
PPG Hellige B.V.
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