Title:
PICTURE DEFORMATION CORRECTING CIRCUIT
Document Type and Number:
Japanese Patent JPH1132230
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To improve the reliability of picture deformation correction by constituting a picture deformation correction circuit, in such a way that the circuit can produce a feedback signal for picture deformation correction which is not affected by dispersion in characteristics of the parts constituting the circuit. SOLUTION: An anode high voltage EH of a CRT is adjusted by supplying a feedback signal 14b for controlling high voltage to a high-voltage control section 15. When the signal 14b is supplied to the section 15, a voltage divider 10 voltage divides the voltage EH, and a buffer amplifier 11 outputs a high- voltage detecting voltage V0 which becomes the divided high voltage. The voltage V0 is a fluctuating voltage due to the characteristic of the divider 10, but a high-voltage fluctuation detecting voltage V1 without fluctuation after adjustment is obtained by further dividing the voltage V0 by means of a resistance circuit composed of resistors R5 and R6 . These, constant correction can be performed on high-voltage fluctuation at all times by supplying the voltage V1 to a picture deformation correcting circuit section 12 as a feedback signal for correcting screen strain.
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Inventors:
WATABE HITOSHI
Application Number:
JP18249197A
Publication Date:
February 02, 1999
Filing Date:
July 08, 1997
Export Citation:
Assignee:
TOSHIBA CORP
International Classes:
H04N3/185; H04N3/223; (IPC1-7): H04N3/185; H04N3/223
Attorney, Agent or Firm:
Susumu Ito
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