Television – Cathode-ray tube burn-in prevention
Reexamination Certificate
2005-05-31
2005-05-31
Kostak, Victor R. (Department: 2614)
Television
Cathode-ray tube burn-in prevention
C348S673000, C348S379000
Reexamination Certificate
active
06900830
ABSTRACT:
A CRT display device includes an on-screen display circuit for producing a display signal displayed on-screen on a CRT and superposing said produced display signal on a video signal; a brightness restraining circuit for suppressing the brightness of CRT in a range below an upper limit value based on an anode current of CRT; and a controller for controlling the operation of the on-screen display circuit and the operation of the brightness restraining circuit, and controlling a power supply to turn on or off; wherein when a display signal having a great area ratio of higher brightness portion is a discharging display signal, said controller controls said on-screen display circuit to produce the discharging display signal, upon an instruction for turning off the power supply, and controls the power supply to turn off when the operation of the brightness restraining circuit to suppress the brightness is relieved or stopped.
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Funai Electric Co. Ltd.
Kostak Victor R.
Osha & May L.L.P.
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