JPS5647187A - Color cathode-ray tube driving circuit - Google Patents

Color cathode-ray tube driving circuit

Info

Publication number
JPS5647187A
JPS5647187A JP12264579A JP12264579A JPS5647187A JP S5647187 A JPS5647187 A JP S5647187A JP 12264579 A JP12264579 A JP 12264579A JP 12264579 A JP12264579 A JP 12264579A JP S5647187 A JPS5647187 A JP S5647187A
Authority
JP
Japan
Prior art keywords
constant
variable
current
voltage
sources
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
JP12264579A
Other languages
Japanese (ja)
Inventor
Michitaka Osawa
Shuzo Matsumoto
Hitoshi Maekawa
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 JP12264579A priority Critical patent/JPS5647187A/en
Publication of JPS5647187A publication Critical patent/JPS5647187A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/648—Video amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

PURPOSE:To improve the white color reproducibility of a screen dark part, etc., by adjusting the cut-off voltage of an electron gun by using a constant current source, composed of an element with current saturation characteristics such as a transistor, for current supply to a variable contant-voltage source. CONSTITUTION:To variable constant-voltage sources 11R, 11G and 11B are supplied constant currents from constant current sources 13R, 13G and 13B. Constant current sources make use of current saturation characteristics of transistors and bipolar transistors 14, for example, are used to form them together with variable resistors 15 for determining current values. While attention is given so that transistors operate in active regions at any times, variable resistors 15 are adjusted to supply minimum currents required by variable voltage sources 11R, 11G and 11B to maintain constant voltage characteristics.
JP12264579A 1979-09-26 1979-09-26 Color cathode-ray tube driving circuit Pending JPS5647187A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12264579A JPS5647187A (en) 1979-09-26 1979-09-26 Color cathode-ray tube driving circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12264579A JPS5647187A (en) 1979-09-26 1979-09-26 Color cathode-ray tube driving circuit

Publications (1)

Publication Number Publication Date
JPS5647187A true JPS5647187A (en) 1981-04-28

Family

ID=14841088

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12264579A Pending JPS5647187A (en) 1979-09-26 1979-09-26 Color cathode-ray tube driving circuit

Country Status (1)

Country Link
JP (1) JPS5647187A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59219091A (en) * 1983-05-27 1984-12-10 Hitachi Ltd Brightness adjusting circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59219091A (en) * 1983-05-27 1984-12-10 Hitachi Ltd Brightness adjusting circuit

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