Method and system for optimizing cathode output for aging a cathode ray tube during manufacture
First Claim
1. A system for aging a cathode ray tube during manufacture, comprising:
- a first electron gun located in the cathode ray tube;
a second electron gun located in the cathode ray tube;
a memory configured to store a first detected output level value of the first electron gun, a second detected output level value of the second electron gun, and an offset value, wherein the offset value is the smaller of a first value and a second value, where the first value is representative of a difference between a maximum output level value and the first detected output level value, and the second value is representative of a difference between the maximum output level value and the second detected output level value;
a processor coupled to the memory, said processor generating a first scaled value by adding the first detected output level value and the offset value, and a second scaled value by adding the second detected output level value and the offset value;
a first summing circuit coupled to the processor and the first electron gun, said first summing circuit providing a first aging signal to the first electron gun based on a first control value and the first scaled value; and
a second summing circuit coupled to the processor and the second electron gun, said second summing circuit providing a second aging signal to the second electron gun based on a second control value and the second scaled value.
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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.
12 Citations
13 Claims
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1. A system for aging a cathode ray tube during manufacture, comprising:
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a first electron gun located in the cathode ray tube; a second electron gun located in the cathode ray tube; a memory configured to store a first detected output level value of the first electron gun, a second detected output level value of the second electron gun, and an offset value, wherein the offset value is the smaller of a first value and a second value, where the first value is representative of a difference between a maximum output level value and the first detected output level value, and the second value is representative of a difference between the maximum output level value and the second detected output level value; a processor coupled to the memory, said processor generating a first scaled value by adding the first detected output level value and the offset value, and a second scaled value by adding the second detected output level value and the offset value; a first summing circuit coupled to the processor and the first electron gun, said first summing circuit providing a first aging signal to the first electron gun based on a first control value and the first scaled value; and a second summing circuit coupled to the processor and the second electron gun, said second summing circuit providing a second aging signal to the second electron gun based on a second control value and the second scaled value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for aging a cathode ray tube during manufacture, comprising:
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storing a first detected output level value of a first electron gun; storing a second detected output level value of a second electron gun; storing an offset value, wherein the offset value is the smaller of a first value and a second value, where the first value is representative of a difference between a maximum output level and the first detected output level value, and the second value is representative of a difference between the maximum output level value and the second detected output level value; generating a first scaled value by adding the first detected output level value and the offset value; generating a second scaled value by adding a the second detected output level value and the offset value; providing a first aging signal to the first electron gun based on a first control value and the first scaled value; and providing a second aging signal to the second electron gun based on a second control value and the second scaled value. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification