Electric lamp and discharge devices: systems – Cathode ray tube circuits – Ray modulation
Patent
1997-10-27
1999-11-02
Westin, Edward P.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Ray modulation
315 10, 345207, 345 11, 345 12, 345 20, 348380, 445 6, 445 62, H01J 942, H01J 949, H04N 1700, G09G 510
Patent
active
059777117
ABSTRACT:
The present invention relates to a method and system for optimizing the output of at least two electron guns in a cathode ray tube for aging the cathode ray tube during manufacture. The system comprises at least two electron guns located in the cathode ray tube and a memory configured to store an offset value that is representative of a difference between a maximum output level and a detected output level for each of the electron guns. The system further comprises a processor coupled to the memory. The processor generates a first scaled signal by adding a first signal representative of an input voltage corresponding to the detected output level of the first electron gun and an offset signal representative of the offset value, and a second scaled signal by adding a second signal representative of an input voltage corresponding to the detected output level of the second electron gun and the offset signal. A first summing circuit is coupled between the processor and the first electron gun, which combines a first control signal and the first scaled signal to provide a first aging signal to the first electron gun. A second summing circuit is coupled between the processor and the second electron gun, which combines a second control signal and the second scaled signal to provide a second aging signal to the second electron gun. The optimizing technique may also be applied to a third electron gun.
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McElroy Alexander
Nakazono Hiroyuki
Van Du Vincent
Gardner Shane R.
Sony Corporation
Sony Electronics Inc.
Westin Edward P.
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