Patent Number: 6,396,222

Title: Cathode ray tube protection system

Abstract: A cathode ray tube protection system for protecting a cathode ray tube frommaintenance of high voltage residual occurring when power is turned on oroff or due to abnormal operation in a projection-type television isprovided. The cathode ray tube protection system includes: a high voltageoutput unit for providing a high voltage used for driving a cathode raytube; a high voltage variation detector for detecting a varied highvoltage of the high voltage output unit; a cathode ray tube driver forproviding a predetermined voltage for driving the cathode ray tube; amedium voltage power supply fuse short-circuit detector for detecting ashort-circuit state of a medium voltage fuse based on an operation stateof the cathode ray tube driver; and a pulse width modulation processor forgenerating a pulse width modulation signal for limiting output of the highvoltage output unit depending on outputs of the high voltage variationdetector and the medium voltage power supply fuse short-circuit detectorwhen the medium voltage fuse short-circuits, regardless of the varied highvoltage.

Inventors: Lim; Nam-gyu (Suwon, KR)


International Classification: H04N 3/20 (20060101); H04N 3/16 (20060101); H01J 029/96 ()

Expiration Date: 05/28/2014