Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1990-04-30
1991-07-30
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315384, 315386, 358220, G09G 104, H01J 2952, H04N 530
Patent
active
050362577
ABSTRACT:
A voltage at a control grid of a cathode ray tube is generated at a blanking level to provide beam current blanking when horizontal deflection loss occurs. The control grid voltage at the blanking level is developed in a capacitor prior to an instant in which the horizontal deflection loss occurs. When the capacitor voltage is applied to the control grid to provide the blanking level, the capacitor is discharged slowly. To maintain the capacitor charged, prior to such instant when horizontal deflection is lost, the capacitor voltage is not applied to the control grid as long as the horizontal deflection is normal, regardless of whether vertical deflection loss occurs. Either horizontal deflection loss or vertical deflection loss will disable a video driver stage that controls the cathode of the cathode ray tube for providing additional beam current blanking capability.
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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. 07/515,499 entitled A Deflection Loss Protection Arrangement for a CRT, in the names of Leroy Samuel Wignot and Lawrence Edward Smith.
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.
Knight Peter R.
Norman Marvin N.
Smith Lawrence E.
Henig Sammy S.
Issing Gregory C.
Laks Joseph J.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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