Deflection loss protection arrangement for a CRT

Details Deflection loss protection arrangement for a CRT Deflection loss protection arrangement for a CRT

1990-04-30

1991-07-23

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

358220, G09G 104, H04N 530

Patent

active

050346652

ABSTRACT:
Three vertical deflection windings of corresponding three deflection yokes that are mounted on three cathode ray tubes of a projection video are coupled in series through corresponding three connector pairs. Three horizontal deflection windings of the corresponding three deflection yokes are coupled in parallel through the corresponding three connector pairs. When any of the three connector pairs is left disengaged, a disabling signal that is indicative of a loss of a vertical deflection current in the series coupled vertical deflection windings is generated. The disabling signal is coupled to a corresponding video driver of each of the cathode ray tubes for providing beam current blanking to protect the screens of the tubes against a screen burn damage.

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Pp. 1 and 2 of schematic diagram entitled Rear Projection CRT Board, dated 3/25/88 and 1/12/89.
U.S. patent application Ser. No. 07/516,386 entitled a Self Biasing Protection Arrangement for a Cathode Ray Tube, in the name of John Barrett George.
U.S. patent application Ser No. 07/515,513 entitled A Protection Circuit for a Cathode Ray Tube, in the name of John Barrett George.
Schematic diagram for PV-140/Digital (G) Zenith Rear Proj. Color Digital TV Receiver, reprinted in Profax, May 1990.
U.S. patent application Ser. No. 07/516,385 entitled Projection TV Deflection Loss Protection Circuit, in the names of Marvin Neil Norman, Lawrence Edward Smith & Peter Ronald Knight.
U.S. patent application Ser. No. 07/515,512 entitled Video Display Apparatus With Kinescope Spot Burn Protection Circuit, in the names of Thomas David Gurley and Leroy Samuel Wignot.

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