JPS5713862A - Focus compensating circuit - Google Patents

Focus compensating circuit

Info

Publication number
JPS5713862A
JPS5713862A JP8660780A JP8660780A JPS5713862A JP S5713862 A JPS5713862 A JP S5713862A JP 8660780 A JP8660780 A JP 8660780A JP 8660780 A JP8660780 A JP 8660780A JP S5713862 A JPS5713862 A JP S5713862A
Authority
JP
Japan
Prior art keywords
grid
signal
supplied
voltage
coupling capacitor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP8660780A
Other languages
Japanese (ja)
Inventor
Junji Nomura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP8660780A priority Critical patent/JPS5713862A/en
Publication of JPS5713862A publication Critical patent/JPS5713862A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/26—Modifications of scanning arrangements to improve focusing

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Details Of Television Scanning (AREA)

Abstract

PURPOSE:To improve focus characteristics without varying the current of a white peak signal, by reducing the 1st grid voltage of a CRT while raising the 2nd grid voltage by making use of the white peak signal when receiving the signal. CONSTITUTION:To a three-electron gun color cathode-ray tube 1, a primary-color signal from a signal circuit 12 is supplied and then while a DC voltage applied to a terminal 7 is divided and supplied to the 1st grid 3, a DC voltage applied to a terminal 8 is divided and applied to the 2nd grid 4. A video signal from the signal circuit 12, on the other hand, is supplied to an HPF9 and an inverting amplifier 10 via a coupling capacitor 11. The output of this HPF9 is supplied to the 1st grid 3 via a coupling capacitor 13 and the output of the amplifier 10 is supplied to the 2nd grid 4 via an HPF18 and a coupling capacitor 14. When a white peak signal is received, high frequency components of the signal are extracted by the HPFs 9 and 18 and while the voltage of the grid 3 is reduced, that of the grid 4 is raised to prevent blooming.
JP8660780A 1980-06-27 1980-06-27 Focus compensating circuit Pending JPS5713862A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8660780A JPS5713862A (en) 1980-06-27 1980-06-27 Focus compensating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8660780A JPS5713862A (en) 1980-06-27 1980-06-27 Focus compensating circuit

Publications (1)

Publication Number Publication Date
JPS5713862A true JPS5713862A (en) 1982-01-23

Family

ID=13891693

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8660780A Pending JPS5713862A (en) 1980-06-27 1980-06-27 Focus compensating circuit

Country Status (1)

Country Link
JP (1) JPS5713862A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60191570A (en) * 1984-03-12 1985-09-30 Matsushita Electric Ind Co Ltd Picture display device
EP0571028A2 (en) * 1992-05-21 1993-11-24 Koninklijke Philips Electronics N.V. Display device including a correction circuit for correcting the focussing voltage

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60191570A (en) * 1984-03-12 1985-09-30 Matsushita Electric Ind Co Ltd Picture display device
JPH045310B2 (en) * 1984-03-12 1992-01-31
EP0571028A2 (en) * 1992-05-21 1993-11-24 Koninklijke Philips Electronics N.V. Display device including a correction circuit for correcting the focussing voltage
EP0571028A3 (en) * 1992-05-21 1994-04-13 Philips Electronics Nv

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