CRT display apparatus and control method thereof

Electric lamp and discharge devices: systems – Cathode ray tube circuits – With radiant energy sensitive control means

Reexamination Certificate

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Details

C315S008000, C345S589000

Reexamination Certificate

active

06987362

ABSTRACT:
A CRT display apparatus having an FBT amplifying an inputted voltage and outputting the amplified voltage to an anode of a CRT, a vertical regulator to regulate a V-size of a screen, and a vertical deflector to vertically deflect a scanning line, further comprises a brightness change sensor to sense a voltage applied to an input terminal of a secondary induction coil provided in the FBT, and to output a sensed signal to the vertical regulator; and a brightness change compensator to output a compensating value to the vertical regulator based on the voltage applied to the input terminal, a frequency of the scanning line, and a specification size of the screen to compensate a brightness change. With this configuration, a V-size fluctuation due to a brightness change is minimized in the CRT display apparatus.

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