Title:
【発明の名称】陰極線管スクリーン保護回路
Document Type and Number:
Japanese Patent JP3061069
Kind Code:
B2
Abstract:
A circuit for protecting a cathode ray tube screen from damage by an electron beam includes a semiconductor switch device having an input coupled to a signal related to a deflection signal for the electron beam. The switch device is coupled to a voltage supply and the circuit further includes a charge storage device coupled to the switch device and further coupled to a control grid of the cathode ray tube. The charge storage device is charged through the switch device by the voltage supply when the deflection signal is present at a control input of the switch device. The switch device decouples the supply voltage from the charge storage device when the deflection signal is not present and places a negative blanking voltage developed on the charge storage device across the control grid when the deflection signal is not present to cut-off beam current in the cathode ray tube.
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| JPH10290407 | ON-SCREEN DISPLAY LEVEL CORRECTION DEVICE |
Inventors:
Jiyoung Barreto
Application Number:
JP12851191A
Publication Date:
July 10, 2000
Filing Date:
April 30, 1991
Export Citation:
Assignee:
Thomson Consumer Electronics Incorporated
International Classes:
H04N3/20; (IPC1-7): H04N3/20
Domestic Patent References:
| JP63308478A | ||||
| JP62135260U | ||||
| JP59152863U | ||||
| JP575105B2 |
Attorney, Agent or Firm:
Hiroshi Tanaka (2 outside)